Hafler TRM8 Owner's Manual

TRM8

MONITORING SYS

Installation & Operation

®

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nova

DESIGNED AND

ASSEMBLED IN THE

USA

MONITORING SYSTEM

Declaration of Conformity

Application of Council Directive: 73/23/EEC (low voltage directive)

Standard(s) to which Conformity is Declared: EN55013

EN55020

EN60065

Manufacturer’s Name: Hafler

Manufacturer’s Address: 546 South Rockford Drive, Tempe, Arizona 85281

Importer’s Name: _______________________________________________________

Importer’s Address: _______________________________________________________

Type of Equipment:

Model No.: TRM8

Serial No. ______________________________Year of Mfg. ’96 ’97 ’98

2-channel Audio Power Amplifier/Speaker

I, the undersigned, hereby declare that the equipment specified above conforms

to the above Directive(s) and Standard(s)

Place: Hafler

Date: James C. Strickland, VP Engineering

12/11/96

NOTICE - IMPORTANT SAFETY INFORMATION

The lightning flash with arrowhead symbol within an equilateral triangle
is intended to alert the user to the presence of uninsulated "dangerous

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

WARNING:

DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

TO PREVENT FIRE OR SHOCK HAZARD

!

voltage" within the product's enclosure, that may be of sufficient magni­tude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert
the user of the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.

1. READ INSTRUCTIONS

All the safety and operating instructions of your Hafler equipment
should be read before power is applied to the equipment.

2. RETAIN OWNER'S MANUAL

These safety and operating instructions should be retained for
future reference.

3. HEED WARNINGS

All warnings on the equipment and in the operating instructions are
important and should be followed.

4. FOLLOW INSTRUCTIONS

All operating and use instructions are important and should be
followed.

5. HEAT

The equipment should be kept away from areas of high tempera­ture, i.e., heater vents, radiators, stoves/ovens, fireplaces, etc.

6. VENTILATION

The equipment should be used in an area suitable for proper
ventilation. Care should be taken not to impede airflow in and
around the cabinet.

7. WATER AND MOISTURE

The equipment should not be used in or around water, such as a
bathtub, sink, or swimming area. Also, the equipment should not
be used in areas prone to flooding, such as a basement.

8. POWER SOURCES

The equipment should be connected only to a power source of the
same voltage and frequency as that listed on the rear panel above
the power cord entry point.

9. POWER CORD PROTECTION

Power cords should be arranged so they do not interfere with the
movement of objects in the room: people, fan blades, utility carts,
etc. Also, care should be taken that the cord is not pinched or cut,
and placed so it is not in danger of being pinched or cut, as in under
a rug, around a tight corner, etc.

connection. It is important that the blades of the equipment’s plug
be able to fully insert into the mating receptacle. Never remove the

round grounding pin on the plug in an attempt to mate to a two
wire ungrounded receptacle: use a grounding adaptor with the

grounding tab or wire suitably connected to earth ground.

11. NON-USE PERIODS

During periods of extended non-use, the power cord should be
unplugged from the power source.

12. CLEANING

The equipment should be cleaned only as detailed in the operating
instructions.

13. OBJECT AND LIQUID ENTRY

Care should be taken so that objects and/or liquids, such as cleaning
fluids or beverages, are not spilled into the enclosure of the
equipment.

14. DAMAGE REQUIRING SERVICE

Hafler equipment should be serviced by qualified service personnel
when:

A. The power supply cord or plug has been damaged, or

B. Objects have fallen onto, or liquid has been spilled into the

equipment, or

C. The equipment has been exposed to rain, or

D. The equipment does not appear to operate normally or

exhibits a marked change in performance, or

E. The equipment has been dropped, or the enclosure has

been damaged.

15. SERVICING

The user should not attempt to service the equipment beyond that
which is described in the operating instructions. All other service
should be referred to qualified service personnel.

10. POWER CORD GROUNDING

The power supply cord is of a three wire grounded type, designed
to reduce the risk of electric shock sustained from a live cabinet. It
is assumed to be of suitable length for most uses of the equipment.
The use of extension cords and power strips is discouraged unless
they are of suitable rating to deliver the required total current for
safe operation of all connected equipment. Furthermore, extension
cords or power strips must provide the same three wire grounded

16. CARTS AND STANDS

The equipment should be used with carts or stands only of sufficient
strength and stability for the use intended.

An equipment and cart combination should be moved with care.
Quick stops and starts, excessive force, and uneven surfaces may

cause the equipment and cart combination to topple.

– i –

ADVERTENCIA – INFORMACION DE SEGURIDAD IMPORTANTE

El símbolo de flecha relámpago dentro de un triángulo equilátero, es para
alertar al usario de la presencia de “voltajes peligrosos” no aislados en el
interior del aparato, los cuales pueden ser de suficiente magnitud para
constituir un riesgo de choque eléctrico a las personas.

El símbolo de exclamación dentro de un triángulo equilátero, es para alertar
al usuario de la presencia de instrucciones importantes de operación y
mantenimiento (servicio) en la documentación que acompaña al equipo.

SPAÑOL

E

PELIGRO

RIESGO DE DESCARGA

ELÉCTRICA NO ABRÍR.

PRECAUCÍON:

Para Prevenir el incendio o la descarga electrica, no

exponer este equipo a la lluvia o a la humedad.

!

1. LEA LAS INSTRUCCIONES

Todas las instrucciones de seguidad y operación de su equipo
Hafler, deben ser leídas antes de que el equipo sea conectado
dléctricamente.

2. CONSERVE EL MANUAL DEL PROPIETARIO

Estas instrucciones de seguridad y operación, deben ser conservadas
para futuras referencias.

3. CUADROS DE ADVERTENCIAS

Todas las advertencias en el equipo y en las instrucciones de
operación, son importantes y deben ser seguidas.

4. SIGA LAS INSTRUCCIONES

Todas las instrucciones de uso y operación son importantes y deben
ser seguidas.

5. CALOR

El equipo debe ser mantenido lejos de areas de alta temperatura,
como por ejemplo: ventilaciones de calentadores, radiadores,
estufas/hornos, hogueras, etc.

6. VENTILACION

El equip debe ser usado en áreas con ventilación adecuada. Deben
er tornadas las precauciones necesarias para no impedir el flujo de
aire dentro y alrededor del aparato.

poder suministrar la corrioente requerida pra la operación segura
de todo el equipo conectado. Aun más, las extensiones deben
proveer de la misma conección aterrada de tres hiles. Es importante
que el enchufe se pueda introducir completamente en el receptáculo.
Nunca remeva el pin de aterramiento en un intento por conectar el
cable en un receptáculo de dos hilos no aterrado: use un adaptador
de aterramiento que esté adecuadamente conectado a un punto de
tierra.

11. PERIODOS SIN USO

Durante períodos prolongados sin uso del equipo, el cable de
corriente debe ser desconectado de la fuente de electrixidad.

12. LIMPIEZA

El equip debe ser limpiado solo en la forma que se detalla en las
instrucciones de operación.

13. INTRODUCCIÓN DE OBJETOS Y LIQUIDO

Deben ser tornadas precauciones con el fin de que objetos y/ó
líquidos, tales como fluidos de limpieza y gaseosas, no sean
derramados dentro del chassis del aparato.

14. DAÑOS QUE REQUIEREN DE SERVICIO

Los equipos Hafler deben ser llevados a servicio por personal
calificado cuando:

7. AGUA Y HUMEDAD

El equipo no debe ser usado en el agua ó alrededor de ésta, tales
como en una bañera, tanque o áreas de nado. También, el equipo
no debe ser usado en áreas propensas a inundaciones, tales como
en un sótano.

8. FUENTES DE PODER

El equipo debe ser conectado a una fuente de poder del mismo
voltaje y frecuencia que el indicado en el panel trasero sobre el
punto de entrada del cable de corriente.

9. PROTECCION DEL CABLE DE CORRIENTE

Los cables de corriente deben ser dispuestos de forma tal que no
interfieran con el movimiento de objetos en la sala: personas, aspas
de ventilación, carretillas, etc. También, es necesario tener cuidado
de que el cable no esté punzado o cortado, y debe estar ubicado de
forma tal que esto no ocurra, como podría suceder debajo de una
alfombra o al pasar el cable por una esquina aguda, etc.

10. ATERRAMIENTO DEL CABLE DE CORRIENTE

El cable de corriente es del tipo aterrado de tres hilos, diseñado para
reducir el riesgo de una descarga eléctrica procendent de un chasis
energizado. Se asume que su longitud es suficiente para la mayoría
de usos del equipo. El uso de extensiones y multienchufes no es
recomendado, a menos que tengan el amperaje adecuado para

A. El cable de corriente ó el enchufe haya sido dañado, ó

B. Objetos ó líquido hayan sido introducidos ó derramado en
el equipo, ó

C. El equipo haya sido expuesto a lluvia, ó

D. El equipo aparenta no operar normalmente ó exhibe un
marcado cambio en su desempeño, ó

E. El equipo se ha caído, o el chassis ha sido golpeado.

15. SERVICIO

El usuario no deberá intentar darle servicio al equipo más allá de lo
que está descrito en el instructivo de operación. Todo lo demás,
deberá ser referido a servicio por personal calificado.

16. CARRETILLAS Y SOPORTES

El equipo podrá ser usado con carretillas y soportes que tengan la
fortaleza y estabilidad suficiente para el uso previsto.

La combinación equipo/carretilla deberá ser movida con cuidado.
Rápidas paradas y arranques, excesiva fuerza y superficies imparejas,
pueden causar el volcamiento del conjunto de carretilla/equipo.

– ii –

ATTENTION: INFORMATIONS IMPORTANTES DE SÉCURITÉ

La lumière clignotante du symbole de la flêche à l'intérieur d'un triangle
équilatéral, à pour objet d'alerter l'utilisateur de la présence “d'un voltage
dangereux” non-isolé à l'intérieur du produit, qui pourrait être de magnitude
suffisante au risque d'éléctrocution.

RANÇAIS

F

ATTENTION

RISQUE DE CHOC

ÉLECTRIQUE NE PAS OUVRIR

!

AVERTISSEMENT:

Afin de prévenir les risques de feu ou de choc, ne pas

exposer cet appareil à la pluie ou à l'humidité.

1. LIRE LES INSTRUCTIONS

Le mode d'emploi et les mesures de sécurité de votre équipement
Hafler devraient être consultés avant sa mise en marche.

2. CONSERVER LE GUIDE DE L'UTILISATEUR

Le mode e'emploi et les mesures de sécurité devraient être
conservés pour des références futures.

3. CONSIDÉRATIONS DE MISE EN GARDE

Le mode d'emploi et les mises en garde concernant cet équipement
sont de grande importance et devraient être suivis.

4. SUIVRE LE MODE E'EMPLOI

Le mode d'emploi et les conseils d'utilisation sont importants et
devraient être suivis.

5. CHALEUR

Le matériel devrait être préservé loin de toute source de chaleur:
radiateurs, cuisinière/fours, cheminées,…etc.

6. VENTILATION

Le matériel devrait être utilisé dans un endroit à bonne ventila­tion. Il reste nécessaire de respecter la circulation de flux d'air à
l'intérier et autour du meuble.

Le point d'exclamation, à l'intériur d'un triangle équilatéral, à pour objet de
prévenir l'utilisateur de l'importance des instructions de fonctionement et de
maintenance, jointes à l'appareil.

11. PÉRIODES DE NON-UTILISATON

Durant les périodes de non-utilisation, la prise de courant ne
devrait pas être branchée à une source d'energie.

12. NETTOYAGE

Le matériel devrait être nettoyé en respectant les instructions
indiquées.

13. PENETRATION DES LIQUIDES

Un attention particulière est éxigée quant à la dispersion de
liquides tels que les produits de nettoyage et boissons, de façcon
à éviter toute pénetration dans l'enceinte du matériel.

14. DÉGÂT NÉCESSITANT UNE RÉVISION

Le matériel Hafler devrait être révisé par des personnes qualifées
de service après-vente, lorsque:

A. Les fiches ou la prise de courant ont été endommagé, ou:

B. De objets sont tombés sur le matériel, ou des liquides s'y sont

dispersés, ou:

C. Le matériel a été exposé à la pluie, ou:

7. EAU ET HUMIDITÉ

Le matériel ne devrait pas être utilisé près d'une source d'eau,
telle qu'une baignoire, un évier, ou une aire de baignade. De
plus, le matériel ne devrait pas être utilisé dans des lieux sujets
aux innondations, tels que les sous-sols.

8. SOURCES D'ÉNERGIE

Le matériel devrait seulement être relié à une source d'énergie de
même voltage et fréquence que celle indiquée sur le tableau
arrière, au dessus de la fiche d'entrée de la prise de courant.

9. PROTECTION DE LA PRISE DE COURANT

La prise de courant devrait être arrangée de façon à ne pas
interférer avec le déplacement d'objets (chariots, pales de
ventillateurs…etc.) ou de personnes à l'intérieur de la pièce.
D'autre part, il faudrait faire tres attention à ce que la prise ne soit
pas percée ou coupée, ou disposée de façon à risquer de l'être,
comme sous un tapis, autour d'un angle pointu…etc.

10. PRISE DE COURANT ÀTROIS FICHES

La prise de courant est composée de trois fiches, désignées à
réduire le risque de décharge électrique de l'appareil.

Elle devrait être de longueur suffisante pour la plupart des
utilisations de ce matériel. L'utilisation de rallonge t d'adaptateur
est déconsellée à moins dêtre en mesure de fournir la charge
électrique requise à un fonctionement sans risque, de tout
matériel relié.

D. Le matériel ne semble pas fonctioner correctement, ou

affiche un changement de performance, ou:

E. Le matériel a été renversé à terre, ou l'enceinte a été

endommagée.

15. REVISION

L'utilisateur ne devrait pas essayer de réviser le matériel en allant
plus loin que ce qui a été décrit dans le mode d'emploi. Toute
autre réviion devrait être confiée à un personnel qualifié.

16. CHARRIOTS ET MEUBLES

Le matériel devriat être utilisé avec des charriots et meubles de
qualité et stabilité suffisante à son utilisation préconçue.

L'ensemble du matériel et du charriot devrait être déplacé avec
précaution. Des mises en marche et arrêts brusques, des colli­sions excessives ainsi que des surfaces inégales peuvent renverser
l'ensemble du matériel et du charriot.

– iii –

ACHTUNG – WICHTIGE SICHERHEITS – INFORMATIONEN

EUTSCH

D

Um die gefahr eines elektroschocks oder feuer zu

vermeiden, setzen sie das gerät keinem regen oder

1. INSTRUKTIONEN LESEN

Alle Sicherheits- und Operationshinweise Ihres Hafler Equipments
sollten vor der Inbetriebnahme gelesen werden.

2. BETRIEBSANLEITUNG AUFBEWAHREN

Bewahren Sie die Bedienungsanleitung sorgfältig auf, damit Sie in
dieser auch in Zukunft nachschlagen können.

3. WARNUNGEN BEACHTEN

Alle Warnungen des Gerätes und der Bedienungsanleitung sind
extrem wichtig und müssen befolgt werden.

4. INSTRUKTIONEN BEACHTEN

Alle Operations- und Gebrauchshinweise sind extrem wichtig und
müssen beachtet werden.

5. HITZE

Das Equipment sollte fern von Hitze ausstrahlenden Geräten
aufgestellt werden, wie z.B. Heizungen, Öfen etc.

6. VENTILATION

Das Equipment sollte so aufgestellt werden, daβ eine ausreichende
Ventialition gewährt wird.

7. WASSER UND FEUCHTIGKEIT

Das Equipment sollte nicht im oder in der Nähe von Wasser benutzt
werden, wie z.B. in Schwimmbädem, Saunen etc. Es sollte ebenfalls
nicht in Überschwämmungsgefährdeten Gebieten aufgestellt werden,
wie z.B. Kellerräumen.

8. STROMANSCHLUβ

Das Equipment darf nur an eine Stromversorgung angeschlossen
werden, die die gleichen Parameter aufweist, welche auf der
Rückseite, über em Anschluβterminal des Gerätes, aufgelistet sind.

ACHTUNG

GEFAHR EINES

ELEKTRISCHEN SCHLAGS

NICHT ÖFFNEN

WARNUNG:

extremer feuchtigkeitaus.

!

Der Blitz mit dem Pfeil, in einem gleihschenkligen Dreieck, soll den benutzer
vor unisolierter “gefährlicher Spannung” innerhalb des Gerätes warnen.

Das Ausrufezeichen, in einem gleichschenkligen Dreieck, soll den Benutzer
darauf aufmerksam machen, daβ dem Gerät wichtige Operations - und Service

- Informationen beigefügt sind.

11. ZEITRÄUME IN DENE DAS GERÄT NICHT GENUTZT WIRD

Wird das Gerät über einen längeren Zeitraum nicht genutzt (z.B.
Urlaub), ziehen Sie bitten den Netzstecker aus der Steckdose.

12. REINIGEN

Reinigen Sie das Gerät nur, wie in der Bedienungsanleitung detailliert
beschrieben.

13. EINDRINGEN VON FREMDKÖRPERN

Achten Sie darauf, daβ weder Fremdkörper, noch Flüssigkeiten in
das Gerät eindringen.

14. ERFORDERLICHER REPARATURSERVICE

Hafler Equipment sollte nur von qualifizierten Service-Technikern
instand gesetzt werden, wenn:

A. Das Stromversorgungskabel beschädigt wurde

B. Eine Flüssigkeit in das Gerät eingedrimgem ist

C. Das Gerät Regen ausgesetzt wurde

D. Das Gerät nicht mehr ordnungsgemäβ funktioniert, ggf. nicht

mehr die volle Leistung abgibt

E. Das Gerät runtergefallen ist oder das Gehäuse beschädigt
wurde

15. SERVICE

Der Benutzer sollte nur den Service ausführen, der in der
Bedienungsanleitung für den Benutzer freigegeben wird. Den
weiterführenden Service sollte nur von qualifizierten Tevhnikern
durchgeführt werden.

9. SCHUTZ DER ZULEITUNG

Die Zuletungen sollten so verlegt werden, daβ diese nicht in den
Bewegungsbereich anderer Möbelstücke oder Personen hereinragen.
Achten Sie darauf, das das Kabel nicht gequestscht oder
durchschnittren wird, wie z.B. unter Schränken oder an scharfen
Kanten etc.

10. MASSEANSCHLUβ

Das dreiadrige Anschlubkabel ist mit einem Erdungsleiter ausgestattet,
welcher die Risiken eines Elektroschocks verringert. Das Kabel hat
eine Länge, welche für die meisten Anwendungen völlig ausreicht.
Wenn Sie Verlängerungskabel benutzen, achten Sie darauf, das dies
die erforderlichen Ströme bertragen können. Benutzen Sie immer
dreiadrige Verlängerungskable.

16. AUFSTELLUNG

Das Equipment sollte so aufgestellt werden, daβ der gewählte
Untergrund die erforderliche Stabilität aufweist, so daβ eine
gefahrlose Bnutzong gewährleistet wird.

Das Equipment und der Untergrund sollte mit äuberster Vorsicht
bewegt werden. Bei schnellen Bewegungen oder starkem
Abbremsen, kann es zum Umkippen des Equipments kommen.

– iv –

NOTARE – IMPORTANTI INFORMAZIONI SULLA SICUREZZA

Il simbolo del fulmine in un triangolo equilatero vuole avvertire della presenza

TALIANO

I

Per prevenire incendio scariche elettriche, non esporre

ATTENZIONE

RISCHIO DI SCARICHE

ELETTRICHE NON APRIRE

ATTENZIONE:

questo apparato a pioggia o umiditá.

!

di tensioni elevate non isolate e di valore sufficiente per costituire rischio di
shock elettrico alle persone.

Il punto esclamativo contentuto in un triangolo equilatero vuole avvertire
l'utente della presenza di parti di servizio e di manutenzione che sono
dettagliate nel manuale di istruzioni.

1. LEGGETE LE ISTRUZIONI

Tutte le istruzioni riguardanti la sicurezza ed il funzionamento
devono essere lette prima di applicare tensione all'apparato.

2. CONSERVATE IL MANUALE

Queste istruzioni riguardanti la sicurezza ed il funzionamento
devono essere conservate come riferimento futuro.

3. AVVERTENZE

Tutte le avvertenze poste sull'apparato e sul libretto di istruzioni
sono importanti e devono essere seguite.

4. SEGUIRE LE ISTRUZIONI

Tuttle le istruzioni operative e di funzionamento devono essere
seguite.

5. TEMPERATURA

L'apparato deve essere mantenuto lontano da tuttle le zone ad alta
temperature, termosifoni, termoconvettori, stufe e forni, caminetti
ed altro.

6. VENTILAZIONE

L'apparato deve essere posizionato in aree convenienti per una
corretta ventilazione. Prestare attenzione che sia consentita
circolazione d'aria attorno e dentro il cabinet.

7. ACQUA E POLVERE

L'apparato deve essere posizionato lontano da zone contenenti
acqua, come vasche a bagno, acquari e piscine. Inoltre non deve
essere impiegato in aree soggette ad allagamento, come le cantine.

8. REQUISITI DI ALIMENTAZIONE

L'apparato deve essere connesso solo ad un'alimentazione della
stessa tensione e frequenza di quanto scritto sulla parte posteriore
del telaio.

9. PROTEZIONE DEL CAVO DI ALIMENTAZIONE

Il cavo di alimentazione deve essere posizionato in modo di non
interferire con il movimento di oggetti nella stanza: persone,
ventilatori, carrelli, ecc…prestate attenzione anche che il cavo non
sia tagliato o spellato e che non possa tagliarsi e spellarsi.

11. PERIODI DI NON UTILIZZO

Durante lunghi periodi di non utilizzo, staccare il cavo di
alimentazione.

12. PULIZIA

L'apparato deve essere pulito solo come indicato dalle istruzioni.

13. INGRESSO DI OGGETTI E LIQUIDI

Si deve prestar attenzione che oggetti e liquidi, come fluidi detergenti
e bibite, non vengano versati all'interno dell'apparato.

14. RIPARAZIONI

Gli apparati Hafler devono essere riparati da personale qualificato
quando:

A. Il cavo di alimentazione o la spina sono danneggiati

B. Oggetti sono caduti all'interno del telaio o quando del
liquido è entrato

C. Quando l'apparato è stato esposto a pioggia

D. Quando l'apparato non sempra funzionare normalmente o
quando esibisce un cambiamento di prestazioni o

E. Quando è caduto o il telaio è stato danneggiato

15. ASSISTENZA

L'utente non deve tentare di prestare assistenza all'apparato, se non
per quanto esposto nelle istruzioni. Tutti gli altri interventi devono
essere effettuati da un tecnico specializzato.

16. CARRELLI E STAND

L'apparato deve essere impiegato su carrelli o stand solo se questi
sono sufficientemente solidi e stabili per la funzione a cui si vuole
dedicarli.

La combinazione di carrello ed apparato deve essere mossa con
cautela. Fermate e partenze improvvise, forze eccessiva e superfici
irregolari, possono ribaltare la cominzione carrello e apparato.

10. MESSA A TERRA

Il cavo di alimentazione è del tipo a tre fili con terra ed è progettato
pr ridurre il rischio di shock elettrici. Si presume che sia della
lunghezza sufficiente per la maggior parte degli impieghi. L'impiego
di prolunghe e adattatori è sconsigliato se questi non garantiscono
la potenza sufficiente per i corretto fuinzionamento degli apparati
connessi. E altersì importante che vengano sempre impiegate
prolunghe con la configurazaione a tre fili con terra.

– v –

P ERFORMANCE SPECIFICATIONS

TRM8

Free Field Frequency Response 45Hz-21kHz, ±2dB
Peak Acoustic Output ≥123dB (per pair w/music @ 1m)
Total Harmonic Distortion (THD) <0.5%, 100Hz-21kHz (90dB @ 1m on axis)
High Frequency Driver 1" (25mm) Soft Dome
Low Frequency Driver 8" (200mm) Polypropylene Cone/

Nitrile Rubber Surround

Cabinet 0.46 cu. ft. (13 liters) vented
Front Panel: Power Switch

High Frequency POWER/CLIP/THERMAL LED
Low Frequency POWER/CLIP/THERMAL LED

Rear Panel: Combination XLR-1/4" input jack

RCA Input Jack
Unbalanced/Balanced DIP Switch
Input Sensitivity DIP Switches
Tweeter/Woofer Mute DIP Switches
Bass Shelving DIP Switches
Treble Shelving DIP Switches
IEC Standard Line Input / AC Line Fuse

Dimensions 10

Net Weight 35 lbs. (15.88kg)

1

⁄4"W x 157⁄16"H x 13"D

(26.04cm x 39.21cm x 33.02cm)

Frequency Response

@ 1m on axis

A

MPLIFIER

Power Rating FTC (20Hz-20kHz, 0.1% THD)

75 Watts @ 6 ohms (high frequency)
150 Watts @ 4 ohms (low frequency)

Signal-to-Noise >100dB
Slew Rate 100 V/µs
CMRR 70dB typical @ 1kHz
Input Impedance 47kΩ per phase balanced, 47kΩ unbalanced
Input Sensitivity Range 500mV to 3V (unbalanced)

275mV to 1.5V (per phase balanced)
(+4dB, +1dB, –2dB, –5dB, –8dB, –11dB)

Gain +33dB max. to +18dB min.
Power Consumption 30W / 490mA @ 120 VAC (idle power)

(both channels driven) 154W / 1.9A @ 120 VAC (1/8 power)

405W / 4.75A @ 120 VAC (full power)
35W / 250mA @ 230VAC (idle power)
150W / 900mA @ 230VAC (1/8 power)
410W / 2.2A @ 230VAC (full power)

C

ROSSOVER

Crossover Frequency 2.5kHz
Crossover Slope 24dB/octave Linkwitz-Riley
Subsonic Filter 30Hz @ 12dB/octave
Bass Shelving 40Hz to 200Hz, ±4dB

(+4dB, +2dB, 0dB, –2dB, –4dB)

Treble Shelving 3kHz to 20kHz, ±4dB

(+4dB, +2dB, 0dB, –2dB, –4dB)

Specifications are subject to change without notice.

– vi –

157⁄16”

Energy Time Curve

Horizontal Polar Response

Front View

1

10

⁄4”

Side View

13”

T ABLE OF CONTENTS

SAFETY PRECAUTIONS ........................................................................................................................................... i

PERFORMANCE SPECIFICATIONS .........................................................................................................................vi

Frequency Response Graph
Energy Time Curve Graph
Horizontal Polar Response Graph

INTRODUCTION ................................................................................................................................................... 1

TECHNICAL DESIGN FEATURES ............................................................................................................................ 1

FRONT & REAR PANEL VIEWS............................................................................................................................... 4

INSTALLATION

Location ........................................................................................................................................................... 5

Acoustic Center ................................................................................................................................................ 6

Mounting.......................................................................................................................................................... 6

OPERATION

Input Switch ..................................................................................................................................................... 7

Input Sensitivity ................................................................................................................................................ 8

Amplifier Mute ................................................................................................................................................. 8

Bass Shelving.................................................................................................................................................... 9

Treble Shelving................................................................................................................................................. 9

AC Line .......................................................................................................................................................... 10

Power Switch ................................................................................................................................................. 10

LED Indicators ................................................................................................................................................ 11

Rubber Pad..................................................................................................................................................... 11

Logo Protective Film ....................................................................................................................................... 11

Break-In and Warm Up .................................................................................................................................. 11

Cleaning and Maintenance ............................................................................................................................. 11

SERVICE REFERENCE

Schematic Diagram ...................................................................................................... removable center spread

PC Board Layout........................................................................................................... removable center spread

Parts List ......................................................................................................................................................... 12

Functional Block Diagram .............................................................................................................................. 15

Circuit Operation ..................................................................................................................................... 16

Calibration ............................................................................................................................................... 16

Input Circuit ............................................................................................................................................. 17

Tweeter Crossover.................................................................................................................................... 17

Woofer Crossover .................................................................................................................................... 18

Thermal Protection................................................................................................................................... 18

Clipping Indicator .................................................................................................................................... 19

On Indicator ............................................................................................................................................ 19

Wave Guide/Woofer Removal ................................................................................................................. 20

Tweeter Replacement............................................................................................................................... 20

Amplifier Removal ................................................................................................................................... 21

WARRANTY ......................................................................................................................................................... 22

INTRODUCTION

Thank You and congratulations on your purchase of the HAFLER TRM8 reference monitor, the world's finest brand
in professional audio equipment.

The TRM8 (Trans•nova Reference Monitor) is a bi-amplified, two-way near field monitor offering unmatched
quality and performance in a truly professional grade product. The TRM8 is great for Professional Studios, Digital
Work Stations, Broadcast Booths, and Home Project Studios.

Although we realize a professional such as yourself already knows a thing or two about pro audio, we urge you to
read this manual to at least humor our technical writer. For ease of use, this manual is organized into three main
sections: Installation, Operation, and Service Reference. “Installation” covers the set-up of your new HAFLER
equipment in the system. “Operation” covers the controls and how to use them for optimum performance.
“Service Reference” contains field service information useful for technicians and engineers.

TECHNICAL DESIGN FEATURES

The TRM8 amplifiers utilize our trans•nova circuit topology employing MOSFETS in the output and power supply
stages combined with our DIAMOND transconductance driver stage resulting in superior sound quality.

An active 4th order Linkwitz-Riley crossover sends frequencies above 2.5kHz to a 75 watt amplifier driving a
proprietary wave guide tweeter, and frequencies below 2.5kHz to a 150 watt amplifier driving an 8" transducer.
The high frequency channel features up to ±4dB of Treble shelving, while the low frequency channel features up
to ±4dB of Bass shelving. In addition, the low frequency channel includes an active 2nd order subsonic filter to
limit harmful frequencies below 30Hz. Monitoring the status of each high and low frequency channel is done with
an LED indicating Power On, Clipping and Thermal.

The high frequency transducer is a Ferrofluid cooled 1" (25mm) soft dome hemispherical tweeter utilizing a rigid
but lightweight silk diaphragm. A Phase Lens and axis-symmetric exponential waveguide improve the transition
of soundwaves from planar to spherical which result in excellent high frequency dispersion and coherent on-axis
frequency response. The low frequency transducer is a proprietary 8" (200mm) diecast basket woofer utilizing a
20 mil polypropylene cone with a 20 mil dust cap. The suspension consists of a nitrile rubber surround and an
extended collar flat spider. The motor is constructed from a 1.5" diameter voice coil on an anodized, aluminum
former with an extended vented pole piece. The 44 oz. ferrite magnet is magnetically shielded to suppress stray
leakage flux to only 4" – well within the confines of the monitor's walls making it great for use near CRT monitors.

The cabinet is made from acoustically dead 19mm MDF, internally lined with damping material and features a rear
firing radiused Exoport for reduced turbulence. The outside features a semi-gloss finish and includes a rubber pad
on the underside to control vibration.

– 1 –

Amplifier

Trans•nova (U.S. Patent 4,467,288)

®

The trans•nova (TRANSconductance NOdal Voltage Amplifier) is a patented circuit that allows the audio
signal to pass through the amplifier at low voltage. Each amplifier channel utilizes its own “fully floating”
power supply and is configured to increase power gain. The increase in power gain allows the driver stage to
operate at a lower voltage. A low voltage drive stage is the same principle used in high quality preamplifiers
to produce high linearity and wide bandwidth.

E-I I-E

trans•nova circuitry

The resulting design utilizes an output stage with a simpler gain structure and a shorter signal path than
conventional high voltage (bi-polar) designs. The number of stages is reduced from five or more to three. The
output stage is further refined into a trans-impedance stage (current to voltage converter) to achieve a short
loop (fast) negative feedback. The output stage is driven cooperatively by a transconductance stage (voltage
to current converter).

THE RESULT: Superior sound quality, greater efficiency and higher reliability.

DIAMOND (U.S. patent 5,673,000)

®

DIAMOND (Dynamically Invariant AMplification Optimized Nodal Drive) is an important advance in
circuit design which reduces high frequency distortion. DIAMOND combines the linearity of Class A
operation with the current headroom of a Class B system by operating the MOSFET driver stage with 20dB
or more of current headroom, whereas traditional drivers have only 6dB of current headroom. The result is
a dramatic reduction in high frequency distortion, combined with improved ultrasonic stability.

THE RESULT: Colorless high frequency reproduction and greater inherent stability.

– 2 –

Tweeter

Wave Guide

®

The wave guide is a proprietary axis-symmetrical form of horn mounted to the tweeter to increase efficiency.
The wave guide improves the transition of sound waves (from planar to spherical) smoothly from the throat
of the wave guide to the mouth. The unique shape and smooth surfaces improve the tweeter's off-axis
frequency response as well as provide coherent on-axis response.

THE RESULT: Improves dispersion for a wider “sweet spot.”

Woofer

Shielded Magnet

®

A shielded magnet is used to reduce the radiation of high-strength magnetic fields from the woofer's motor
assembly. Suppression is accomplished by attaching a “bucking” magnet to the motor assembly in order to

keep stray leakage flux within the monitor cabinet. This type of shielding
prevents color and image distortion when placing the woofer in close
proximity to direct view (CRT) television receivers and computer monitors.

THE RESULT: Prevents distortion in TV and computer monitors.

Cabinet

Phase Coherent

®

Each monitor is Phase Coherent in order to assure proper arrival times of all frequencies in the near field
environment. This is accomplished by aligning both transducer's voice coils on a common ZDP (Zero Delay
Plane) axis. The cabinet baffle positions the woofer forward and the waveguide displaces the tweeter back with
an additional 43µs delay in the high frequency amplifier to precisely “tweak” the tweeter onto its ZDP axis.
This allows the acoustic center, located midway between the high and low frequency transducers, to
coherently deliver a flat frequency and phase response around the crossover point.

THE RESULT: Delivers a flat frequency and phase response.

– 3 –

Rear Panel View

CAUTION: For continued protection

from risk of fire, replace only with same

type and rating of fuse.

Attention: Utiliser un fusible de rechange

de même type.

XLR Connections

WARNING: DO NOT REMOVE COVER

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK

DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

!

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

TRM8 – Reference Monitor

3

21

+

–

Phone Connections

+

–

250V T5A

XLR or 1/4"

Balanced

+4dBu input

100dB SPL

@ 1m output

0dB

Bass

Shelving

Mute Woofer

Sensitivity

dBu input required

for 100dB SPL @ 1m

A Division of Rockford Corp.

Tempe, AZ 85281 U.S.A.

Made in the U.S.A.

®

120V~

60Hz

0dB

Treble

Shelving

Signal

In

+1 –2 –5 –8 –11dBu

dB

–4 –2 +2 +4

Bass Shelving

RCA

Unbalanced

Mute Tweeter

dB

–4 –2 +2 +4

Treble Shelving

+4

+2

0

–2

–4

dB

3kHz 20kHz

40Hz

dB

+4

+2

0

–2

–4

200Hz

Heatsink

Power

Switch

AC Line

Input

AC Line

Fuse

Unbalanced

Input

Balanced

Input

Front Panel View

Tweeter

Wave Guide

Treble LED

Bass LED

– 4 –

Rubber Pad

Woofer

I NSTALLATION

LOCATION

The location of your reference monitors in addition to the acoustics of the listening room will influence the system
frequency response. In the near field environment, our ears are more sensitive to direct sound rather than the
reverberation of sound. Below are some recommendations for the initial set-up which may help you optimize
performance in complex acoustic environments. In any configuration, keep the rear of the monitor at least 5" (12.7cm)

away from any wall or obstruction to reduce excessive boundary “loading” of the woofer vent and to optimize heat
sink cooling.

Fig. 1

Aiming the monitors directly forward (Fig. 1) may cause response problems resulting in inadequate stereo imaging.
Aiming the monitors toward you and spaced equally like a triangle (Fig. 2) provides the best imaging and produces the
flattest frequency response.

Fig. 3

INADEQUATE

Off-Axis Response

INADEQUATE

Horizontal Alignment

Fig. 2

Fig. 4

OPTIMUM

On-Axis Response

OPTIMUM

Vertical Alignment

If you frequently move your chair from side to side in front of your mixing console, positioning the tweeter and woofer
in horizontal alignment (Fig. 3) can create complex lobing patterns. Minimizing this effect can be achieved by placing
the tweeter and woofer in vertical alignment (Fig. 4). If it is essential to position the monitors horizontally, place them
with the tweeters toward the inside.

– 5 –

ACOUSTIC CENTER

3-4 ft.

Max. listening level

Acoustic
Center

Min. listening level

Finding the “Acoustic Center” is accomplished by positioning the
monitors so coherent arrival of the transducers occurs at ear level. The
Acoustic Center is located 3 to 4 feet in front of the monitor, measuring
perpendicularly from the center point of the cabinet (midway between
the woofer and tweeter). Our tests have shown that a flat phase and
frequency response occurs just above and below the Acoustic Center
with the minimum and maximum height spanning between the
tweeter dome and woofer dust cap.

MOUNTING

The monitor may be mounted on a wall or ceiling, using suitable mounting hardware. The base of the monitor includes
mounting inserts designed for use with “OmniMount Systems®” or equivalent mounting products1.

If you mount the monitors to a wall or ceiling, you must take special care to mount them securely to prevent them from
falling and causing damage or injury. Make sure that the mounting hardware (fasteners and connectors) and the surface
you are mounting to are each capable of securely holding the monitor in place even if it is struck or moved. Make sure
the mounting hardware, fasteners, and connectors are rated for an object at least as heavy and bulky as the monitor.

Use good judgement and common sense throughout all phases of the installation and use mounting techniques
appropriate for the surface you select. Use the mounting hardware according to the manufacturer's recommendation
and provide adequate reinforcement to the monitors if needed. Do not mount the monitor only to drywall – make sure
the fasteners are secured to a stud, joist, or other structural support. If appropriate, use a secondary support for added
safety – a properly installed safety cable provides an extra margin of safety and can be installed out of sight easily.

OmniMount Part #

100 ST-MP / 100 STX-MP

1

“OmniMount Systems®” is a registered trademark of OmniMount Systems, 1501 West 17th Street, Tempe, Arizona 85281-6255,

TEL [phone] FAX [phone]. OmniMount Systems is not affiliated with Hafler or Rockford Corporation.

OmniMount Part #

100 WB / 100 WBX

– 6 –

OPERATION

INPUT SWITCH

The unbalanced input uses a conventional RCA phone jack.
Move the input switch UP to use this jack.

The balanced input jack is a dual function connector accepting
a 1/4" Phone (Tip-Ring-Sleeve) or an XLR plug. The 1/4" Phone
jack is connected according to conventional usage. The XLR jack
is connected according to the IEC and AES standard. Move the
input switch DOWN to use this jack.

Unbalanced Input

Balanced Input

RCA
Unbalanced

XLR or 1/4”
Balanced

RCA
Unbalanced

XLR or 1/4”
Balanced

ON

1234

ON

1234

XLR Balanced Input

Check output of source unit for proper signal polarity

INPUT FROM

SOURCE

Pin 1 = GND
Pin 2 = (+)
Pin 3 = (–)

1
2

GND

–

3

+

Check output of source unit for proper signal polarity

Tip = (+)
Ring = (–)
Sleeve = GND

1/4" TRS Balanced Input

INPUT

+

–

SHIELD

FROM

SOURCE

Many popular mixers use unbalanced outputs and can be used with the balanced inputs. To minimize residual
ground noise, we recommend using twisted pair cable or short cable lengths in this type of configuration.

XLR Unbalanced Input

Connect (–) and GND (shield) terminals at

prevent unstable amplifier operation

INPUT FROM

both ends

of cable to

1/4" TRS Unbalanced Input

INPUT

FROM

SOURCE

SOURCE

Pin 1 = GND
Pin 2 = (+)
Pin 3 = GND

1

3

2

SHIELD

+

Tip = (+)
Sleeve = GND

+

– 7 –

SHIELD

Woofer Designators in Parentheses

!

Qualified Service Personnel Only

Removable Center Spread

SCHEMATIC DIAGRAM

NOTES: Unless specified otherwise

1. All resistors in ohms.

2. All capacitors in microfarads.

3. Channel 1 only shown.

Removable Center Spread

!

Qualified Service Personnel Only

Removable Center Spread

PC BOARD LAYOUT

!

Qualified Service Personnel Only

Removable Center Spread

NOTE: When using the INPUT SENSITIVITY, select only one switch configuration at a time. Engaging
multiple switch configurations (i.e., moving two or more switches up) may cause undesirable operation and
is NOT RECOMMENDED.

INPUT SENSITIVITY

The Input Sensitivity adjustment is used to match the monitor with signal levels from a variety of mixing consoles.
The Input Sensitivity uses DIP switches to match input levels over a 15dB range and are marked +1dB, –2dB, –5dB,
–8dB, and –11dB. These numbers indicate the input in dBu required to produce an output of 100dB SPL @ 1 meter.
When all switches are in the DOWN position, the monitor is matched to +4dB input level. In the +4dB switch
setting, the monitor is less sensitive to the input signal. In the –11dB switch setting, the monitor is more sensitive
to the input signal.

INPUT
LEVEL

+1 –2 –5 –8 –11dBu

ON

1234

+4dB dBu input

100dB SPL

@ 1m output

34

+4dB Input

+1 –2 –5 –8 –11dBu

ON

1234

+4dB dBu input

100dB SPL

@ 1m output

34

+1 –2 –5 –8 –11dBu

ON

1234

+4dB dBu input

100dB SPL

@ 1m output

+1dB Input –2dB Input

34

+1 –2 –5 –8 –11dBu

ON

1234

+4dB dBu input

100dB SPL

@ 1m output

34

+1 –2 –5 –8 –11dBu

ON

1234

+4dB dBu input

100dB SPL

@ 1m output

–5dB Input –8dB Input

34

+1 –2 –5 –8 –11dBu

ON

1234

+4dB dBu input

100dB SPL

@ 1m output

–11dB Input

AMPLIFIER MUTE

The Amplifier Mute can be used to test system diagnostics by turning off the low frequency or high frequency
amplifier. Although the low and/or high frequency amplifier can be disabled, the preamp and crossover portions
of the circuit are still active. Move the “Mute Woofer” switch UP to turn off the low frequency amplifier. Move
the “Mute Tweeter” switch UP to turn off the high frequency amplifier.

Mute Tweeter
Mute Woofer

–11dBu

–8

ON

1234

Mute Tweeter

Mute Woofer

–11dBu

–8

ON

1234

34

Mute Woofer

Mute Tweeter

– 8 –

NOTE: When using the BASS SHELVING & TREBLE SHELVING, select only one switch configuration at a
time. Engaging multiple switch configurations (i.e., moving two or more switches up) may cause undesirable
operation and is NOT RECOMMENDED.

BASS SHELVING

Bass Shelving is used to match the low frequency response of the monitor to the acoustic environment. Bass
Shelving uses DIP switches to control frequencies from 40Hz to 200Hz over an 8dB range and are marked +4dB,
+2dB, –2dB, and –4dB. When all switches are in the DOWN position, the bass level is at 0dB. In any configuration,
a subsonic filter will provide woofer protection at 30Hz and below at a rate of 12dB/octave.

40Hz

+4
+2

0
–2
–4

+4dB

dB

200Hz

ON

1234

40Hz

+4
+2

–2
–4

0

200Hz

ON

1234

dB

40Hz

+4
+2

0
–2
–4

0dB

dB

200Hz

ON

1234

40Hz

+4
+2

–2
–4

–2dB –4dB+2dB

0

200Hz

1234

ON

dB

+4
+2

0
–2
–4

40Hz

TREBLE SHELVING

Treble Shelving uses DIP switches to control frequencies from 3kHz to 20kHz over an 8dB range and are marked
+4dB, +2dB, –2dB, and –4dB. When all switches are in the DOWN position, the treble level is at 0dB.

dB

200Hz

ON

1234

+4
+2

dB

0
–2
–4

3kHz 20kHz

+4dB

dB

3kHz 20kHz

ON

1234

+4
+2

–2
–4

0

1234

ON

+4
+2

dB

0
–2
–4

3kHz 20kHz

0dB

– 9 –

dB

3kHz 20kHz

ON

1234

+4
+2

–2
–4

+4
+2

0

dB

0
–2
–4

3kHz 20kHz

ON

1234

ON

1234

–2dB –4dB+2dB

AC LINE

The TRM8 operates from a 115 VAC/60Hz power line. The TRM8 CE operates from a 230 VAC 50/60Hz power line.
Connection is made by a 16 gauge, IEC Type 320, grounded line cord. For safety considerations only a properly
grounded (earthed) receptacle should be used. If a grounded circuit is not available, do not break off the ground
pin; use the proper adapter plug for a two wire receptacle with the grounding plug suitably connected to earth
ground.

IMPORTANT: The power line fuse is mounted on the rear panel. If this fuse blows, replace it only with

!

the same type and rating as indicated in the parts list.

POWER SWITCH

The POWER switch is located on the front panel. The TREBLE LED and BASS LED will illuminate GREEN, indicating
those respective amplifier channels are on. It is possible to leave the power switch in the ON position and switch
the monitor remotely through a power distribution block or switched outlet. When doing so, make sure the switch
is rated for the current required by the monitor.

Standard practice is to turn the amplifier on last and off first when switching components to prevent

!

sending damaging transients to the speakers.

Es costumbre encender el amplificador de último y apagarlo de primero cuando se estan encendiendo/

!

apagando otros equipos, para así evitar el envío de transientes dañinas a los parlantes.
Il est de pratique courante de commencer par tourner l'amplificateur sur “off” et de terminer par “on,”

!

lorsqu'il s'agit de prévenir l'envoie de passages nuisible aux haut-parleurs.
Der Verstärker sollte als letztes Gerät eingeschaltet und als erstes Gerät wieder ausgeschaltet werden,

!

um eine Beschädigung der Lautsprecher durch spannungsspitzen zu vermeiden.
L'uso comune consiglia l'accensione dell'amplificatore per ultimo e lo spegnimento per primo quando

!

si accendono i vari componenti, per evitare l'invio di transitori danneggianti agli altoparlanti.

– 10 –

LED INDICATORS

Amplifier operation is monitored internally and each channel has a status LED. These indicators can be used for
system troubleshooting in case of aberrant behavior.

TREBLE LED – Monitors the status of the high frequency (treble) amplifier.
BASS LED – Monitors the status of the low frequency (bass) amplifier.

COLOR STATUS

GREEN Power on*

FLASHING RED Clipping

RED Thermal

*Indicates the amplifier is on regardless of input signal

RUBBER PAD

A large rubber pad is supplied to eliminate annoying buzzes and rattles when placing the monitors on mixing
consoles or similar mounting surfaces. The pad is perforated with 4 holes to accommodate mounting brackets
as discussed in the MOUNTING section of this manual. Attach the pad to the underside of the monitor in the
following manner:

• Thoroughly clean area where pad will be positioned (i.e., with isopropyl alcohol)

• Remove paper liner from rubber pad (avoid touching adhesive with fingers)

• Position pad in desired location (be sure to align the mounting bracket holes)

• Press pad firmly to insure good contact

LOGO PROTECTIVE FILM

A clear protective film is left intact on the “TRANS•NOVA” and “HAFLER” logos to prevent scratches during
shipment. After the monitors are installed, carefully remove the protective layer from the logos.

BREAK-IN and WARM-UP

We recommend initially breaking in the woofer for approximately 8 hours with musical information to establish
the monitor's natural bass response. To achieve the best sonic performance and image stability from the internal
amplifiers, we recommend letting them warm up for 1 hour before beginning any critical listening.

CLEANING & MAINTENANCE

There is no requirement for regular maintenance on the electronic components of the monitor. If the cabinet
or woofer becomes soiled, it can be cleaned using a damp, soft cloth. If the monitor is located in a particularly
dusty environment, cleaning the inside with compressed air or vacuuming every 18 to 24 months is sufficient.

– 11 –

P ARTS LIST

DESIGNATOR VALUE PART #

ALL RESISTORS IN OHMS

R1 2k, 1/10W, 1% RM/10-2001B
R2 1k, 1/10W, 1% RM/10-1001B
R3 1k, 1/10W, 1% RM/10-1001B
R4 47k, 1/10W, 5% RM/10-473B
R5 2k, 1/10W, 1% RM/10-2001B
R6 1k, 1/10W, 1% RM/10-1001B
R7 1k, 1/10W, 1% RM/10-1001B
R8 2k, Trimpot RV-202
R9 200, Trimpot RVH-201
R10 47k, 1/10W, 5% RM/10-473B
R11 1k, 1/10W, 1% RM/10-1001B
R12 10k, 1/10W, 5% RM/10-103B
R13 100k, 1/10W, 5% RM/10-104B
R14 470, 1/10W, 5% RM/10-471B
R15 300k, 1/10W, 5% RM/10-304B
R16 4.7k, 1/10W, 1% RM/10-472B
R17 10k, 1/10W, 5% RM/10-103B
R18 100k, 1/10W, 5% RM/10-104B
R19 604k, 1/10W, 5% RM/10-6043B
R20 47k, 1/10W, 5% RM/10-473B
R21 2.2M, 1/10W, 5% RM/10-225B
R22 100k, 1/10W, 5% RM/10-104B
R23 100k, 1/10W, 5% RM/10-104B
R24 470, 1/10W, 5% RM/10-471B
R25 1k, 1/10W, 1% RM/10-1001B
R26 1M, 1/10W, 5% RM/10-105B
R27 316, 1/4W, 1% RM/4-3160C
R28 316, 1/4W, 1% RM/4-3160C
R29 3.92k, 1/4W, 1% RM/4-3921C
R30 3.92k, 1/4W, 1% RM/4-3921C
R31 220, 1/10W, 5% RM/10-221B
R32 470, 1/10W, 5% RM/10-471B
R33 100, 1/4W, 5% RM/4-101C
R34 100, 1/4W, 5% RM/4-101C
R35 820, 1/4W, 5% RM/4-821C
R36 300k, 1/10W, 5% RM/10-304B
R37 10, 1/10W, 5% RM/10-100B
R38 100, 1/10W, 5% RM/10-101B
R39 100, 1/10W, 5% RM/10-101B
R40 2k, 1/10W, 1% RM/10-2001B
R41 1.5k, 1/4W, 5% RM/4-152C
R42 56.2k, 1/4W, 1% RMP/4-5622-03
R43 1k, 1/10W, 1% RM/10-1001B
R44 43.2k, 1/10W, 1% RM/10-4322B
R45 1k, 1/10W, 1% RM/10-1001B
R46 3.92k, 1/4W, 1% RMP/4-3921-03
R47 2.2M, 1/10W, 5% RM/10-225B
R48 3.92k, 1/4W, 1% RM/4-3921C
R49 4.7k, 1/10W, 5% RM/10-472B
R50 4.7k, 1/10W, 5% RM/10-472B
R51 15k, 1/10W, 5% RM/10-153B
R52 604, 1/10W, 1% RM/10-6040B
R53 2.2M, 1/10W, 5% RM/10-225B
R54 68, 1/4W, 5% RM/4-680C
R55 220, 1/10W, 5% RM/10-221B
R56 15k, 1/10W, 5% RM/10-153B
R57 10k, 1/10W, 5% RM/10-103B
R58 200, Trimpot RVH-201
R59 43.2k, 1/10W, 1% RM/10-4322B
R60 220, 1/10W, 5% RM/10-221B
R61 10k, 1/10W, 5% RM/10-103B
R62 2.2M, 1/10W, 5% RM/10-225B
R63 470, 1/10W, 5% RM/10-471B
R64 220, 1/10W, 5% RM/10-221B
R65 1k, 1/10W, 1% RM/10-1001B
R66 1.5k, 1/4W, 5% RM/4-152C
R67 1k, 1/10W, 1% RM/10-1001C
R68 68, 1/4W, 5% RM/4-680C
R69 51, 1/10W, 5% RM/10-510B

R70 51, 1/10W, 5% RM/10-510B
R71 100, 1/4W, 5% RM/4-101C
R72 100, 1/4W, 5% RM/4-101C
R73 2.21k, 1/10W, 1% RM/10-2211B
R74 2.21k, 1/10W, 1% RM/10-2211B
R75 100k, 1/10W, 5% RM/10-104B
R76 100k, 1/10W, 5% RM/10-104B
R77 1M, 1/10W, 5% RM/10-105B
R78 1M, 1/10W, 5% RM/10-105B
R79 1M, 1/10W, 5% RM/10-105B
R80 6.49k, 1/10W, 1% RM/10-6491B
R81 6.49k, 1/10W, 1% RM/10-6491B
R82 43.2k, 1/10W, 1% RM/10-4322B
R83 470, 1/10W, 5% RM/10-471B
R84 470, 1/10W, 5% RM/10-471B
R85 43.2k, 1/10W, 1% RM/10-4322B
R86 5.49k, 1/10W, 1% RM/10-5491B
R87 1.62k, 1/4W, 1% RM/4-1621C
R88 2k, 1/10W, 1% RM/10-2001B
R89 2.21k, 1/10W, 1% RM/10-2211B
R90 2.21k, 1/10W, 1% RM/10-2211B
R91 9.09k, 1/10W, 1% RM/10-9091B
R92 9.09k, 1/10W, 1% RM/10-9091B
R93 3.32k, 1/10W, 1% RM/10-3321B
R94 2k, 1/10W, 1% RM/10-2001B
R95 3.24k, 1/4W, 1% RM/4-3241
R96 1.62k, 1/4W, 1% RM/4-1621C
R97 1.33k, 1/4W, 1% RM/4-1331C
R98 43.2k, 1/10W, 1% RM/10-4322B
R99 332, 1/4W, 1% RM/4-3320C
R100 6.8k, 1/4W, 5% RM/4-682C
R101 6.8k, 1/4W, 5% RM/4-682C
R102 6.8k, 1/4W, 5% RM/4-682C
R103 6.8k, 1/4W, 5% RM/4-682C
R104 2k, Trimpot RV-1073
R105 2k, 1/10W, 1% RM/10-2001B
R106 43.2k, 1/10W, 1% RM/10-4322B
R107 43.2k, 1/10W, 1% RM/10-4322B
R108 43.2k, 1/10W, 1% RM/10-4322B
R109 14k, 1/10W, 1% RM/10-1402B
R110 14k, 1/10W, 1% RM/10-1402B
R111 14k, 1/10W, 1% RM/10-1402B
R112 13k, 1/10W, 5% RM/10-133B
R113 2k, 1/10W, 1% RM/10-2001B
R114 2k, 1/10W, 1% RM/10-2001B
R115 1k, 1/10W, 1% RM/10-1001B
R116 1k, 1/10W, 1% RM/10-1001B
R117 200, Trimpot RVH-201
R118 1k, 1/10W, 1% RM/10-1001B
R119 332, 1/4W, 1% RM/4-3320C
R120 3.92k, 1/4W, 1% RM/4-3921C
R121 470, 1/10W, 5% RM/10-471B
R122 470, 1/10W, 5% RM/10-471B
R123 220, 1/10W, 5% RM/10-221B
R124 470, 1/10W, 5% RM/10-471B
R125 100, 1/4W, 5% RM/4-101C
R126 0,1/10W, 1% RM/10-000B
R128 3.32k, 1/10W, 1% RM/10-3321B
R129 3.32k, 1/10W, 1% RM/10-3321B
R130 150k, 1/10W, 5% RM/10-154B
R131 9.76k, 1/10W, 1% RM/10-9761B
R132 100, 1/4W, 1% RM/4-101C
R133 820, 1/4W, 5% RM/4-821C
R134 9.76k, 1/10W, 1% RM/10-9761B
R135 10.5k, 1/10W, 1% RM/10-1052B
R136 5k, Trimpot RV-502Q
R137 1k, 1/10W, 1% RM/10-1001B
R138 100, 1/10W, 5% RM/10-101B
R139 100, 1/10W, 5% RM/10-101B
R140 2k, 1/10W, 1% RM/10-2001B
R141 1.5k, 1/10W, 1% RM/4-152C
R142 56.2k, 1/4W, 1% RM/4-5622-03

– 12 –

R143 3.24k, 1/10W, 1% RM/10-3241B
R144 3.24k, 1/10W, 1% RM/10-3241B
R145 28k, 1/4W, 1% RM/4-2802
R146 2.2M, 1/10W, 5% RM/10-225B
R147 28k, 1/4W, 1% RM/4-2802C
R148 604, 1/10W, 1% RM/10-6040B
R149 68, 1/4W, 5% RM/4-680C
R150 220, 1/10W, 5% RM/10-221B
R151 220, 1/10W, 5% RM/10-221B
R152 470, 1/10W, 5% RM/10-471B
R153 220, 1/10W, 5% RM/10-221B
R154 1k, 1/10W, 1% RM/10-1001B
R155 1.5k, 1/4W, 5% RM/4-152C
R156 1k, 1/10W, 1% RM/10-1001B
R157 68, 1/4W, 5% RM/4-680C
R158 51, 1/10W, 5% RM/10-510B
R159 51, 1/10W, 5% RM/10-510B
R160 100, 1/4W, 5% RM/4-101C
R161 100, 1/4W, 5% RM/4-101C
R162 1k, 1/10W, 1% RM/10-1001B
R163 8.25k, 1/10W, 1% RM/10-8251B
R164 9.09k, 1/10W, 1% RM/10-9091B
R165 0, 1/10W, 1% RM/10-000B
R166 9.09k, 1/10W, 1% RM/10-9091B
R167 6.49k, 1/10W, 1% RM/10-6491B
R168 100k, 1/10W, 5% RM/10-104B
R169 2k, 1/10W, 1% RM/10-2001B
R170 9.76k, 1/10W, 1% RM/10-9761B
R171 2k, 1/10W, 1% RM/10-2001B
R172 2k, 1/10W, 1% RM/10-2001B
R173 2.21k, 1/10W, 1% RM/10-2211B
R174 1.33k, 1/4W, 1% RM/4-1331C
R175 43.2k, 1/10W, 1% RM/10-4322B
R176 909, 1/10W, 1% RM/10-9090B
R177 43.2k, 1/10W, 1% RM/10-4322B
R178 10k, 1/10W, 5% RM/10-1002B
R179 20k, 1/10W, 1% RM/10-2002B

C1 100pF, 100V, Disc CD-101-034
C2 100pF, 100V, Disc CD-101-034
C3 0.1µF, 50V CYV-104-024
C4 0.1µF, 50V CYV-104-024
C5 .047µF, 50V CYV-473-033
C6 220pF, 50V CDS-221CAAA
C7 220pF, 50V CDS-221CAAA
C8 680pF, 500V, Mica CM-681-030
C9 0.1µF, 50V CDS-104CBBB
C10 47pF, 500V, Mica CM-470-030
C11 10µF, 50V, Electrolytic CER-106C-024
C12 6800µF, 80V, Electrolytic CERS-688D
C13 6800µF, 80V, Electrolytic CERS-688D
C14 0.47µF, 50V CYV-474-024
C15 0.1µF, 50V CYV-104-024
C16 0.1µF, 50V CYV-104-024
C17 0.1µF, 50V CDS-104CBBB
C18 0.1µF, 50V CDS-104CBBB
C19 0.1µF, 50V CDS-104CBBB
C20 0.1µF, 50V CDS-104CBBB
C21 47pF, 500V, Mica CM-470-030
C22 0.47µF, 50V CYV-474-024
C23 0.47µF, 50V CYV-474-024
C24 0.1µF, 50V CDS-104CBBB
C25 0.1µF, 50V CDS-104CBBB
C26 0.22µF, 250V CY-224AC-024
C27 0.1µF, 50V CDS-104CBBB
C28 2.2µF, 50V, Electrolytic CER-225CSM
C29 470µF, 50V, Electrolytic CER-477C
C30 0.1µF, 50V CDS-104CBBB
C31 0.1µF, 50V CDS-104CBBB
C32 470µF, 50V, Electrolytic CER-477C
C33 0.22µF, 250V CY-224AC-024
C34 22pF, 500V, Mica CM-220-030
C35 47pF, 500V, Mica CM-470-030
C36 .0022µF, 50V CYV-222-024
C37 2.2µF, 50V CER-225CSM

– 13 –

C38 47pF, 50V CDS-470CAAA
C39 47pF, 50V CDS-470CAAA
C40 .001µF, 50V CYV-102-024
C41 .001µF, 50V CYV-102-024
C42 .001µF, 50V CYV-102-024
C43 .001µF, 50V CYV-102-024
C44 220pF, 50V CDS-221CAAA
C45 0.1µF, 50V CYV-104-024
C46 0.1µF, 50V CYV-104-024
C47 .001µF, 50V CYV-102-024
C48 .001µF, 50V CYV-102-024
C49 220pF, 50V CDS-221CAAA
C50 .001µF, 50V CDS-102CBAA
C51 100pF, 100V, Disc CD-101-034
C52 100pF, 100V, Disc CD-101-034
C53 0.1µF, 50V CYV-104-024
C54 47pF, 50V CDS-470CAAA
C55 .001µF, 50V CYV-102-024
C56 .001µF, 50V CYV-102-024
C57 0.1µF, 50V CDS-104CBBB
C58 0.1µF, 50V CDS-104CBBB
C59 47pF, 50V CDS-470CAAA
C60 .001µF, 50V CYV-102-024
C61 .001µF, 50V CYV-102-024
C62 .022µF, 50V CYV-223-024
C63 .022µF, 50V CYV-223-024
C64 .0022µF, 50V CYV-222-024
C65 220pF, 50V CDS-221CAAA
C66 0.1µF, 50V CYV-104-024
C67 .047µF, 50V CYV-473-033
C68 680pF, 500V, Mica CM-681-030
C69 7pF, 500V, Mica CM-070-024
C70 10µF, 50V, Electrolytic CER-106C-024
C71 3300µF, 63V, Electrolytic CERS-338E
C72 3300µF, 63V, Electrolytic CERS-338E
C73 0.1µF, 50V CYV-104-024
C74 0.1µF, 50V CYV-104-024
C75 7pF, 500V, Mica CM-070-024
C76 0.47µF, 50V CYV-474-024
C77 0.22,µF, 250V CY-224AC-024
C80 0.1µF, 50V CDS-104CBBB
C81 0.1µF, 50V CDS-104CBBB
C82 0.1µF, 50V CDS-104CBBB
C83 47pF, 50V CDS-470CAAA
C84 0.1µF, 50V CDS-104CBBB
C85 .22µF, 50V CYV-224-024
C86 220pF, 50V CDS-221CAAA

CR1 BAV99L Dual Diode SS-260SM
CR2 BAV99L Dual Diode SS-260SM
CR3 LED, BICLR RED/GREEN SS-1664
CR4 LED, BICLR RED/GREEN SS-1664
CR5 MMBD914L Diode SS-803SM
CR6 MMBD914L Diode SS-803SM
CR7 MMBD914L Diode SS-803SM
CR8 MMBD914L Diode SS-803SM
CR9 BAV99L Dual Diode SS-260SM
CR10 Bridge Rectifier SS-0799-030
CR11 Bridge Rectifier SS-0800-030
CR12 MMBD914L Diode SS-803SM
CR13 MMBD914L Diode SS-803SM
CR14 MMBZ5240BL Zener Diode SS-1052
CR15 BAV99L Dual Diode SS-260SM
CR16 BAV99L Dual Diode SS-260SM
CR17 BAV99L Dual Diode SS-260SM
CR18 BAV99L Dual Diode SS-260SM
CR19 Bridge Rectifier SS-0799-030
CR20 MMBD914L Diode SS-803SM
CR21 MMBZ5240BL Zener Diode SS-1052
CR22 MMBD914L Diode SS-803SM
CR23 MMBD914L Diode SS-803SM
CR24 MMBD914L Diode SS-803SM

!
!

!

Q1 P Channel MOSFET SSH-740T-069
Q2 LM-317, + Regulator SS-1375-046
Q3 LM-337, – Regulator SS-1376-046
Q4 N Channel MOSFET SSH-741T-069
Q5 MMBTAO6L SS-102SM
Q6 MMBT3906L SS-0791
Q7 MMBT3906L SS-0791
Q8 MMBT3904L SS-0792
Q9 N Channel MOSFET SSH-741T-069
Q10 P Channel MOSFET SSH-740T-069
Q11 MMBT5088L SS-0114
Q12 MMBT5088L SS-0114
Q13 MPS-A56 SS-101A
Q14 MPS-A56 SS-101A
Q15 MPS-AO6 SS-102A
Q16 MPS-AO6 SS-102A
Q17 MMBT5088L SS-0114
Q18 MMBT5087L SS-0115
Q20 N Channel MOSFET SSH-741T-069
Q21 MMBTAO6L SS-102SM
Q22 MMBT3906L SS-0791
Q23 MMBT3906L SS-0791
Q24 MMBT3906L SS-0791
Q26 P Channel MOSFET SSH-740T-069
Q27 MMBT5088L SS-0114
Q28 MMBT5088L SS-0114
Q29 MPS-A56 SS-101A
Q30 MPS-A56 SS-101A
Q31 MPS-AO6 SS-102A
Q32 MPS-AO6 SS-102A
Q33 MMBT5088L SS-0114
Q34 MMBT5087L SS-0115
Q35 MMBT3906L SS-0791
Q36 MMBT3906L SS-0791

!

!

Components marked with this symbol are safety critical

!

and should only be replaced with identical components.

Los componentes marcados con el simbolo son

!

imprescindibles para la protección del equipo, por lo

!

cual que solo sean reemplazados por los mismos
componentes.

!
!

Les componsants marqués du symbole sont indis-

!

pensables à la sécuritée et ne peuvent être remplacés

!

qu'avec des composants identiques.

Bauteile, die mit einem gekenzeichnet sind, sind

!

sehr wichtig und dürfen nur mit den orginal Ersatzteilen

!

ausgetauscht werden.

!

I componenti contrassegnati da sono critici per la

!

sicurezza e devono essere rimpiazzati solo con ricambi

!

di valore identico.

!

U1 LM-833D, Dual Opamp SS-187SM
U2 TLO72CD, Opamp SS-1308
U3 LM-833D, Dual Opamp SS-187SM
U4 LM-833D, Dual Opamp SS-187SM
U5 LM-339 Quad Comparator SS-730SM
U7 LM-833D, Dual Opamp SS-187SM
U8 TLO72CD, Opamp SS-1308
U112 LM-833D, Dual Opamp SS-187SM

JW1 2x3 Jumper CC-648
JW2 2x3 Jumper CC-648

J1 Neutrik Combo Jack XLR CC-0588
J2 RCA Jack CCH-232

TS1 Thermistor, 10k SS-1519-A
TS2 Thermistor, 10k SS-1519-A

Thermistor Insulator IN-1646
Transformer TT-1596
IEC Line Cord FAH-1464
IEC Receptacle CC-0918
Fuse Holder Cap FS-0828
Fuse Holder Body FS-0829
5A Slo-Blo Fuse FS-005SB
Power Switch SHW9840
Tweeter SPK9766
Tweeter Dome SHW10049
Woofer FG26326WP
Wave Guide SHW9816
Wave Guide Assembly SPK9897

(Wave Guide/Tweeter/Power Switch/LEDs)

!
!
!
!

!
!
!
!
!
!
!
!
!

MODEL TRM8CE 230 VAC 50/60Hz

Transformer TT-1908
IEC European Line Cord <HAR>FAH-1464-A
Fuse Holder Cap FS-1125

1.25 Slo-Blo Fuse FS-1474

!

!

!

!

– 14 –

TRM8 FUNCTIONAL BLOCK DIAGRAM

+17V

Positive Input

Negative Input

–17V

DC Offset
Integrator

U8B, R146, C76

Protection Switch,

Soft Start Delay

Q24, C70, R168

Current Mirror

Q22, Q23

DIAMOND

CR18,

Q33,

Q34

Differential Amp

+ –

Q27, Q28

Current Source

Q21

Positive Driver

Cascode

Q29, Q30

Feedback

Network

R145, C69

Negative Driver

Cascode

Q32, Q31

Drive

Signal

Bias

Adjust

R117

Local

Feedback

R142 , C68

Positive Output

Q20, Q25

Negative Output

Q19, Q26

B+

Output

B–

– 15 –

S ERVICE REFERENCE

!

CIRCUIT OPERATION

trans•nova Implementation

The transistor Q24 is configured to operate as a switch which controls the constant current source, Q21, of the input
differential amp, Q27 and Q28. When Q24 is off the emitter voltage is low, turning off Q21. Timing of the Soft Start
function is controlled by the charging time of C70 through R168. The THERMAL Protection circuit uses Q24 to shut
down the channel when it activates.

The positive and negative input signals are connected to the differential amp transistors Q27 and Q28. U8B is configured
as a DC servo-integrator to null the input offset currents.

The output of the differential amp is fed to the driver stage by Q33 and Q34 which perform the DIAMOND
transconductance steering function. The cascode pairs Q29, Q30 and Q31, Q32 supply the signal voltage and current
needed to drive the output stage Q20, Q25, and Q19, Q26.

Class AB bias current is controlled by R117.

Local feedback is supplied by the network R142 and C68, and global feedback by R145 and C69.

CALIBRATION

WARNING: Only a competent technician should attempt the following procedure.

Qualified Service Personnel Only

Bias:

The bias control establishes the quiescent Class AB output current of the amplifier. The bias should not need
readjustment from the factory setting; however, if the amplifier is repaired and output devices have been changed,
calibrating the bias is necessary. Disconnect the power to the amplifier before removing the heatsink assembly. To
adjust the bias, disconnect all wires from the heatsink assembly and remove the jumpers JW2 (tweeter) and JW1 (woofer).
Connect an amp meter across the exposed pins. Adjust R117 to get a current reading of 100mA at JW2, and R9 to get
a current reading of 200mA at JW1. Before reconnecting the power cord to the heatsink assembly, connect the loose
brown wire from the power transformer to the remaining terminal of the IEC power connector.

WARNING: Only a competent technician should attempt the following procedure.
Calibrating Common Mode Rejection:

The common mode null is adjusted by R8 (woofer) and R58 (tweeter). If common mode adjustment is needed, follow
this procedure. Disconnect power to the amplifier before removing the heatsink assembly. Disconnect all harnesses
from the assembly. Verify that the AC power cord has been disconnected from the amplifier, then connect the loose
brown wire from the power transformer to the remaining terminal of the IEC power connector. Reconnect power to the
amplifier. Use a sinewave generator to provide a 100Hz common mode signal to the amplifier, making sure the DIP
switch is configured for balanced input. A common mode signal can be accomplished by connecting the generator
signal to the tip and ring of a 1/4" plug (or pins 2 and 3 of an XLR) and ground to the sleeve (or pin 1 of an XLR). Connect
an AC voltmeter to the output terminal of either amplifier, and adjust its common mode potentiometer for minimum
output voltage.

– 16 –

Input Circuit

!

The input signal is connected to the amplifier
through the balanced 1/4" or XLR connector J1, or
the unbalanced RCA connector J2. Balanced/un­balanced switch D1 will ground the inverting input
buffer, allowing operation with an unbalanced
signal on either connector. Input buffers U1A and
U1B provide a stable input impedance, dominated
by R10 and R4. The input circuit gain is set by
switches DS2-DS6. Each switch inserts a different
divider resistor for the feedback resistors R88 and
R169, resulting in up to 15dB of additional input
gain when DS6 is closed.

The non-inverting input signal from U1A pin 1, and
the inverting input signal from U1B pin 7, are
summed together to form an unbalanced signal at
U4A pin 1.

Input

Connector

J1

J2
DS1
R10

R4

Qualified Service Personnel Only

Non-Inverting

Input Buffer

U1A, R88

Summing

Sensitivity

Adjust

DS2 - DS6

Inverting Input

Buffer

U1B, R169

Amplifier

R109, R110,

R111, R112, R8

Tweeter Crossover

Balanced

Input Signal

U1A, U1B

High Frequency

Shelf U7B

DS13 - DS16

2nd Order HP

2500Hz

U7A

43µs

Delay

U3B, U3A

2nd Order HP

2500Hz

U8A

R107, R177

R106, C40, C41

Sensitivity Adjust

R104, R105

The balanced input signal at U1A pin 1 and U1B pin 7 connects to the high-frequency shelf circuit at U7B. Attenuator
divider R179 and R178, and gain resistors R94 and R87 set the default gain of this stage at –4.4dB. Switches DS13-DS16
add various reactive components to the feedback network of U7B, resulting in +4dB, +2dB, –2dB, or –4dB of gain
shelving above 3kHz. The next stage at U7A is a 2500Hz 2nd order high-pass filter. This is followed by a 2-stage 43µs
delay, using U3A and U3B. The last stage consists of another 2500Hz 2nd order high-pass filter, bringing the overall
tweeter crossover response to a 4th order 24dB/octave slope. The final components before the tweeter amplifier (R104
and R105 ) can provide up to 2dB of additional gain to the tweeter channel.

– 17 –

Woofer Crossover

Qualified Service Personnel Only

!

Unbalanced
Input Signal

U4A

2nd Order LP

2500Hz

U112B, R85,

R98, C64, C48

Sensitivity Trim

R136, R137

2nd Order HP

30Hz

U112A, R164,

R130, C45, C46

Low Frequency

Shelf

U112A

DS9 - DS12,

C85

2nd Order LP

2500Hz

U2A, R82, R44,

C36, C42

The input signal at U4A pin 1 connects to the 2500Hz 2nd order low-pass filter at U112B. Approximately 2dB of
additional gain can be added to this stage by adjusting R136 against the divider resistor, R137. The next stage is a 30Hz
sub-sonic high-pass filter. This is followed by an adjustable low-frequency shelving filter which defaults at +6dB gain,
according to the feedback resistors R129 and R134, and dividers R131 and R128. DS9-DS12 will switch in various
reactive feedback networks to accomplish +4dB, +2dB, –2dB, or –4dB of gain shelving below 200Hz. The last stage
is another 2500Hz 2nd order low-pass filter at U2A, which cascades with the previous filter at U112B to produce an
overall 4th order slope of 24dB/octave for the woofer amplifier.

Thermal Protection

Soft Start Switches

Q8, Q24

Tem p

TS1, R25,

Comparator

U5B

CLIP/THERMAL

Indicators

CR3, CR4

The thermal protection is activated, and shuts down audio operation, when the amplifier heatsink reaches an
excessively high temperature. The voltage divider R22 and R23 establishes the reference voltage on pin 5 of U5B. The
control voltage on pin 4 is established by the voltage divider TS1 in parallel with TS2, and R25 and R162. TS1 and TS2
are NTC (Negative Temperature Coefficient) thermistors mounted on the heatsink. As TS1 or TS2 warms and the
resistance falls, the voltage on pin 4 rises. When the voltage on pin 4 exceeds the voltage on pin 5, the output on pin
2 goes low, shutting down the Soft Start switches Q8 and Q24, and lighting both CLIP/THERMAL indicators red.

– 18 –

Clipping Indicator

!

Qualified Service Personnel Only

Drive

Signals

DR,

DRTWT

Clipping

Detectors

U5A, U5D

CLIP/THERMAL

Indicator

CR3, CR4

The CLIP indicators are driven by the comparator U5A and U5D. The voltage divider R56, R57, and R51, R61
establishes the reference voltage for the Clipping detector at pin 7 of U5A and pin 9 of U5D. Excessive drive signal at
pin 6 or pin 8 will trigger its comparator low and light the CLIP/THERMAL indicator red.

On Indicator

Clipping

Detector

U5A, U5D

LED Driver

Q35, Q36

ON

Indicators

CR3, CR4

The bicolor LED, CR3 and CR4 will remain green unless a THERMAL or CLIP condition is detected. The outputs of
comparators U5A and U5D will be high, and Q35 and Q36 will be off, allowing current to flow through the red LED
of CR3 and CR4 from ground to –17V.

– 19 –

WAVEGUIDE/WOOFER REMOVAL

!

Qualified Service Personnel Only

(10) 3/32"

Allen Sockets

Modular Cable

Detail

AC4

Green “+”

Black “–”

COMPONENT WIRE

Green

Black

Red

Power Switch Detail

Brown
Brown/Black

White “–”

Red “+”

Tweeter “+” Green (female 1/8" spade)

Tweeter “–” White (female 1/8" spade)

Woofer “+” Red (female 1/4" spade)

Woofer “–” Black (female 1/4" spade)

LEDs “AC4” Gray Modular (female micro-molex)

Power Switch Brown (female 1/4" spade)

Power Switch Brown/Black (female 1/4" spade)

TWEETER REPLACEMENT DOME

▲

▲

Compression Clip Removal Tweeter Removal Tweeter Dome Placement

▲

Motor/Dome Part #SPK9766 Part #SHW10049

(Replacement Dome only)

Wave Guide Assembly Part # SPK9897

NOTE: The tweeter dome may be replaced up to 3 times without significant loss of magnetic fluid cooling.

We recommend replacing the entire tweeter assembly when servicing thereafter.

– 20 –

AMPLIFIER REMOVAL

!

®

A Division of Rockford Corp.
Tempe, AZ 85281 U.S.A.
Made in the U.S.A.

TRM8 – Reference Monitor

120V~
60Hz

250V T5A

CAUTION: For continued protection
from risk of fire, replace only with same
type and rating of fuse.
Attention: Utiliser un fusible de rechange
de même type.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

WARNING: DO NOT REMOVE COVER

TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

Phone Connections

XLR Connections

!

+

–

–

3

+

21

Bass Shelving

40Hz

Mute Tweeter
Mute Woofer

Sensitivity

dBu input required
for 100dB SPL @ 1m

+1 –2 –5 –8 –11dBu

RCA
Unbalanced

XLR or 1/4"

+4dBu input

Balanced

100dB SPL
@ 1m output

Signal

In

(6) Phillips Screws

Qualified Service Personnel Only

Green “+”

Treble Shelving

+4
+2

dB

0
–2
–4

3kHz 20kHz

+4
+2

dB

0
–2
–4

200Hz

dB

dB

–4 –2 +2 +4

–4 –2 +2 +4

0dB

0dB

Bass

Treble

Shelving

Shelving

COMPONENT WIRE AMPLIFIER DESIGNATOR

White “–”

Red “+”

Black “–”

Modular Cable

Detail

AC3

Tweeter “+” Green (female 1/4" spade) “Green1”

Tweeter “–” White (female 1/4" spade) “White1”

Woofer “+” Red (female 1/4" spade) “Red1”

Woofer “–” Black (female 1/4" spade) “Blk1”

Green

Black

Red

Black1 = to back panel fuse
Black2 = to front panel switch
Green = chassis ground

AC Line Input Detail

Black

L

1

Green

N

Black

2

COMPONENT WIRE AMPLIFIER DESIGNATOR

LEDs Gray Mod (female micro-molex) “AC3”

Transformer Primary Brown (female 1/4" spade) Transformer “Brown”

AC Line Neutral Black2 (female 1/4" spade) AC Line Input “N”

– 21 –

SERVICE POLICY AND LIMITED WARRANTY

Rockford Corporation (Hafler Division) offers a limited warranty on Hafler products on the following terms:

• Length of Warranty

1 year on Reference Monitors

• What is Covered

This warranty applies only to products sold to the original owner and is non-transferable. This warranty only applies
to units sold in the continental United States. You are required to have a copy of the receipt stating the customer's name,
dealer name, product purchased and date of purchase.

• Products found to be defective during the warranty period will be repaired or replaced (with product deemed to be

equivalent) at Hafler's discretion.

• What is NOT Covered

1. Damage caused by accident, abuse, improper operations, water, theft

2. Service performed by anyone other than Hafler or an Authorized Hafler service center

3. Any product purchased outside the United States (please contact your local dealer)

4. Shipping charges to get the unit to Hafler

5. Any product which has had the serial number defaced, altered, or removed

• Limit on Implied Warranties

Any implied warranties including warranties of fitness for use and merchantability are limited in duration to the period
of the express warranty set forth above. Some states do not allow limitations on the length of an implied warranty, so
this limitation may not apply. No person is authorized to assume for Hafler any other liability in connection with the
sale of the product.

• How to obtain service or technical support

Please call 1-800-669-9899 for Rockford/Hafler support. You must obtain an RA # (return authorization number) to
return any products to Hafler. You are responsible for shipment of product to Hafler.

Rockford Corporation
Hafler Division
2055 E. 5th Street
Tempe, Arizona 85281

– 22 –

®

HAFLER

A DIVISION OF

ROCKFORD CORPORATION

546 SOUTH ROCKFORD DRIVE

TEMPE, ARIZONA 85281 U.S.A.

1-888-HAFLER1

LIT10139
6/98

MADE IN THE USA

This product is designed, developed and assembled in the USA by a dedicated

group of American workers. The majority of the components used in the

construction of this product are produced by American companies. However, due

to the global nature of their manufacturing facilities and the electronics parts

industry in general, some parts may be manufactured in other countries.