Rockford Fosgate RFP2408, RFP-2808, RFP2410, RFP-2810, RFP2412 Installation & Operation Manual

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car audio

fanatics

for

punc

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RFP2408/2808
RFP2410/2810
RFP2412/2812
RFP2415/2815
RFP2418/2818

Dear Customer,
Congratulations on your purchase of the world's finest brand of car audio speakers. At

Rockford Fosgate we are fanatics about musical reproduction at its best, and we are
pleased you chose our product. Through years of engineering expertise, hand craftsman­ship and critical testing procedures, we have created a wide range of products that
reproduce music with all the clarity and richness you deserve.

For maximum performance we recommend you have your new Rockford Fosgate
product installed by an Authorized Rockford Fosgate Dealer, as we provide specialized
training through Rockford Technical Training Institute (RTTI). Please read your
warranty and retain your receipt and original carton for possible future use.

Great product and competent installations are only a piece of the puzzle when it comes
to your system. Make sure that your installer is using 100% authentic installation
accessories from Connecting Punch in your installation. Connecting Punch has
everything from RCA cables and speaker wire to Power line and battery connectors.
Insist on it! After all, your new system deserves nothing but the best.

To add the finishing touch to your new Rockford Fosgate image order your Rockford
wearables, which include everything from T-shirts and jackets to hats and sunglasses.

To get a free brochure on Rockford Fosgate products and Rockford wearables, in the U.S.
call 602-967-3565 or FAX [phone]. For all other countries, call +001-602­967-3565 or FAX [phone].

The serial number can be found on the outside of the box. Please record it in
the space provided below as your permanent record. This will serve as
verification of your factory warranty and may become useful in recovering your
speaker if it is ever stolen.

Serial Number: ________________________________
Model Number:________________________________

If, after reading your manual, you still have questions regarding this product,
we recommend that you see your Rockford Fosgate dealer. If you need further
assistance, you can call us direct at 1-800-669-9899. Be sure to have your serial
number, model number and date of purchase available when you call.

PRACTICE SAFE SOUND™

CONTINUOUS EXPOSURE TO SOUND PRESSURE LEVELS OVER

100dB MAY CAUSE PERMANENT HEARING LOSS. HIGH

POWERED

AUTOSOUND SYSTEMS MAY PRODUCE SOUND

PRESSURE

LEVELS WELL OVER 130dB. USE COMMON SENSE

AND

PRACTICE SAFE SOUND.

TABLE OF CONTENTS

Introduction .............................................................................................1

RF Punch XLC Woofer Contents............................................................... 1

Technical Design Features ....................................................................... 1

Stamped Basket .................................................................................. 1

PVA Cone ..........................................................................................1

Inverted Dust Cap .............................................................................. 1

Aluminum Voice Coil Former............................................................. 2

Progressive Dual Laminated Spider ....................................................2

Dual Laminated Foam Surrounds .......................................................2

Hyper-Extended Pole Piece ................................................................2

Vented Bumped Back Plate ................................................................2

Installation ............................................................................................... 3

Recommended Enclosures.................................................................. 3

Building An Enclosure ........................................................................ 5

Calculating Volume............................................................................ 5

Subwoofer Crossovers ........................................................................5

Wiring Configurations ........................................................................6

Specifications........................................................................................... 7

Warranty Information............................................................................... 8

International Information..........................................................................9

Welcome to Rockford Fosgate! This manual is designed to provide
information for the owner, salesperson and installer. For those of you
who want quick information on how to install this product, please turn
to the

Installation Section

of this manual or refer to the icon listed below.
Other information can be located by using the Table of Contents. We,
at Rockford Fosgate, have worked very hard to make sure all the
information in this manual is current. But, as we are constantly finding
new ways to improve our product, this information is subject to change
without notice.

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Sections marked

INSTALLATION

include “slam dunk”
assembly and wiring

directions

– 1 –

INTRODUCTION

The RF Punch XLC Woofers are a full line of low frequency drivers sized
from 8" to 18" and are available in 4 or 8 ohm impedance. The RF Punch

XLC woofers were designed for use primarily in small, sealed or ported
enclosures. By utilizing the latest materials and construction tech-

niques, we are able to offer a speaker with high output at low
frequencies while requiring a minimum of operating space.

RF PUNCH WOOFER CONTENTS

RF Punch XLC Woofer
Installation & Owner's Manual
4 Foam Gaskets

TECHNICAL DESIGN FEATURES

◆ Stamped Basket

The RF Punch XLC Woofers use a stamped Cold Rolled Steel basket
which is rigid and lightweight. The basket is finished in a corrosive
resistant powder coated process used in many automotive
applications.

THE RESULT: A lightweight and rigid woofer

◆ PVA Cone

The cone material used is spruce pulp paper. This provides the
necessary combination of weight and strength and allows high levels
of output without cone break up. The cone is treated with a water
resistant PolyVinyl Acetate (PVA) Emulsion which increases the cone
rigidity and lowers distortion.

THE RESULT: Increases cone rigidity and lowers distortion

◆ Inverted Dust Cap

The use of the inverted dust cap serves to increase the cone rigidity
and improve the power handling by forcing more air through the
voice coil.

THE RESULT: Increases cone rigidity, smooths frequency response
and prevents your friends from feeling obligated to invert them for you.

– 2 –

◆ Aluminum Voice Coil Former

The voice coil former is black, anodized aluminum for highly efficient
thermal transfer. This allows winding high temperature copper wire
in multiple layers for improved efficiency.

THE RESULT: Improves power handling by efficiently dissipating heat

◆ Flat Progressive Dual Laminated Spider

A flat progressive dual laminated spider is employed to provide
stronger suspension for the woofer. A secondary spider is fused to the
primary spider near the critical voice coil bonding point. The combi­nation of these two spiders, in addition to the progressive rolls,
provides the ultimate in linear control for high excursion capability.

THE RESULT: Strengthens suspension for higher excursion capability

◆ Dual Laminated Foam Surrounds

The RF Punch XLC Woofers employ a dual laminated foam surround
for the front of the woofer's suspension. Dual lamination improves
reliability by making the woofer mechanically stronger.

THE RESULT: Adds mechanical strength

◆ Hyper-Extended Pole Piece

The pole piece has been extended to provide a more linear magnetic
field for the operation of the woofer. This lowers distortion and
provides the woofer with better low frequency response.

THE RESULT: Lowers distortion and provides better low frequency
response

◆ Vented Bumped Back Plate

The back plate has been stepped deeper to allow the woofer more
excursion without bottoming out. This enables the speaker to be used
in a smaller enclosure. Additionally, the back plate is vented with a
radiused aerodynamic back vent which efficiently and quietly circu­lates cool air around the voice coil.

THE RESULT: More excursion and increased power handling

– 3 –

INSTALLATION

Recommended Enclosures

Punch 8"

Recommended Sealed .30ft3 (8.50L)

Punch 10"

Recommended Sealed .75ft3 (21.24L)

Punch 12"

Recommended Sealed 1.25ft3 (35.40L)

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Recommended Ported .625ft3 (17.70L)

Fb = 40 Hz
Pd = 2.5" (6.35cm)
Pl = 11.25" (28.57cm)

Recommended Ported 1.0 ft3 (28.32L)

Fb = 35 Hz
Pd = 3" (7.62cm)
Pl = 13.25" (33.65cm)

Recommended Ported 2.0 ft3 (56.63L)

Fb=35 Hz
Pd=4" (10.16cm)
Pl=10.75" (27.30cm)

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Recommended Sealed 4.0ft3 (113.27L)

Punch 15"

Recommended Sealed 2.5ft3 (70.79L)

Punch 18"

Recommended Enclosures

Fb = 35 Hz
Pd = 4" (10.16cm)
Pl = 8" (20.32cm)

Recommended Ported 2.5ft3 (70.79L)

Recommended Ported 4.0ft3 (113.27L)

Fb=30 Hz
Pd=2 x 4" (2 x 10.16cm)
Pl=14.5" (36.83cm)

Building an Enclosure

To work properly, the walls of the enclosure must be rigid and not flex
when subjected to the high pressures generated by the speaker's
operation. For optimum performance, we recommend using 3/4"
MDF (Medium Density Fiberboard) and internal bracing. The enclo­sure should be glued together and secured with nails or screws. MDF
is porous; therefore, it is suggested to also seal the outside walls with
polyurethane.

Calculating Volume

Calculating volume is merely a matter of measuring the dimensions
in inches and using the formula:

1728"

Height x Width x Depth

Box Volume =

(cubic feet)

If two facing sides are of uneven length, add them together and divide
by two to take the average. Using this number will give you the
volume without the necessity of calculating the box in sections and
adding the sections together. The thickness of the baffle material
reduces the internal volume so this must be subtracted from the
outside dimensions to determine the internal volume. The speaker
itself also reduces the internal volume. The amount of air displaced
by each model is listed on the specification sheet and should also be
subtracted from the gross volume calculation.

Subwoofer Crossovers

There are two operational types of crossovers, passive and active.
Passive crossovers (coils or inductors) are placed on the speaker leads
between the amplifier and speaker. An active crossover is an elec­tronic filter which separates the audio signal fed to different amplifi­ers.

For optimum subwoofer performance, we recommend using an

active 80-100Hz low-pass crossover at 12dB/octave.

– 5 –

– 6 –

Wiring Configurations

Three configurations for connecting speakers to an amplifier
are Series, Parallel, and Series-Parallel wiring. A Series con­figuration consists of two or more speakers wired in an string
(end to end). A Parallel configuration consists of two or more
speakers wired with the common terminals connected across
each other. A Series-Parallel configuration is a combination of
both methods. Determine which method will be compatible
with your amplifier.

RT = R1 + R2 + R3 + etc.

1 1 1 1 1

=++++ etc.

R

T

R

1

R

2

R

3

R

4

Series Wiring

Parallel Wiring

• RT indicates the total speaker load

• R1, R2, etc. indicates each speaker in the system

• Red dot indicates “+” terminal of

8 ohm

speaker

• Purple dot indicates “+” terminal of

4 ohm

speaker

Series-Parallel Wiring

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S

PECIFICATIONS

Model RFP2408 RFP2808 RFP2410 RFP2810 RFP2412 RFP2812 RFP2415 RFP2815 RFP2418 RFP2818

Nominal Impedance 4 8 4 848 4848

FS (Hz) 35 37 30 32 28 30 23 25 22 24

RE (Ohm) 3.7 7.3 3.7 7.3 3.7 7.3 3.7 7.3 3.9 7.8

LE (mH) 3.3 5.2 3.3 5.2 3.3 5.2 3.3 5.2 3.8 6.7

QMS 6.18 6.63 5.38 5.23 6.20 5.91 5.51 5.50 5.25 5.70

QES 0.39 0.50 0.39 0.47 0.52 0.71 0.42 0.55 0.49 0.575

QTS 0.37 0.47 0.36 0.43 0.48 0.64 0.39 0.50 0.46 0.522

VAS (cu.ft.) 0.635 0.635 1.62 1.62 4.23 4.23 11.86 11.86 14.44 14.44

VAS (liter) 18 18 46 46 120 120 336 336 409 409

Power (Watts RMS) 200 200 200 200 200 200 200 200 250 250

Power (Watts Peak) 400 400 400 400 400 400 400 400 500 500

SPL (dB @ 1w/1m) 85 85 87 87 89 89 92 92 92 92

X-MAX (inches) 0.31 0.31 0.31 0.31 0.31 0.31 0.31 0.31 0.39 0.39

X-MAX (mm) 8 8 8 8 8 8 8 8 10 10

Sealed Box Vol. (cu. ft.) 0.3 0.3 0.75 0.75 1.25 1.25 2.5 2.5 4.0 4.0

Ported Box Vol. (cu. ft.) 0.625 0.625 1.0 1.0 2.0 2.0 2.5 2.5 4.0 4.0

Speaker Dis. (cu. ft.) 0.05 0.05 0.06 0.06 0.09 0.09 0.113 0.113 0.19 0.19

Mounting Dia. (in.) 7

1

⁄

16

7

1

⁄

16

9

5

⁄

32

9

5

⁄

32

11 11 14 14 16

19

⁄

32

16

19

⁄

32

Mounting Depth (in.) 3

13

⁄

16

3

13

⁄

16

4

1

⁄

2

4

1

⁄

2

5

3

⁄

8

5

3

⁄

8

7

1

⁄

8

7

1

⁄

8

8

1

⁄

2

8

1

⁄

2

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LIMITED WARRANTY INFORMATION

Rockford Corporation offers a limited warranty on Rockford Fosgate products on the
following terms:

• Length of Warranty
1 year on speakers 30 days on speaker B-stock (receipt required)
3 years on electronics 90 days on electronic B-stock (receipt required)
2 years on source units

• What is Covered
This warranty applies only to Rockford Fosgate products sold to consumers by
Authorized Rockford Fosgate Dealers in the United States of America or its
possessions. Product purchased by consumers from an Authorized Rockford
Fosgate Dealer in another country are covered only by that country’s Distributor
and not by Rockford Corporation.

• Who is Covered
This warranty covers only the original purchaser of Rockford product purchased
from an Authorized Rockford Fosgate Dealer in the United States. In order to
receive service, the purchaser must provide Rockford with a copy of the receipt
stating the customer name, dealer name, product purchased and date of purchase.

• Products found to be defective during the warranty period will be repaired or
replaced (with a product deemed to be equivalent) at Rockford's discretion.

• What is Not Covered

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

2. Any cost or expense related to the removal or reinstallation of product

3. Service performed by anyone other than Rockford or an Authorized Rockford
Fosgate Service Center

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

5. Subsequent damage to other components

6. Any product purchased outside the U.S.

7. Any product not purchased from an Authorized Rockford Fosgate Dealer

• 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 Rockford Fosgate
any other liability in connection with the sale of the product.

• How to Obtain Service
Please call 1-800-669-9899 for Rockford Customer Service. You must obtain an
RA# (Return Authorization number) to return any product to Rockford Fosgate. You
are responsible for shipment of product to Rockford.

Ship to: Speakers
Rockford Acoustic Design
(Receiving-speakers)
609 Myrtle N.W.
Grand Rapids, MI 49504
RA#:_________________

Ship to: Electronics
Rockford Corporation
Warranty Repair Department
2055 E. 5th Street
Tempe, AZ 85281
RA#:_________________

– 8 –

INTERNATIONAL

I

NFORMATION

–9 –

LEA DETENIDAMENTE LAS SIGUIENTES INSTRUCCIONES DE
INSTALACÍON DEL PRODUCTO.

Los terminales positivo y negativo de entrada están ubicados uno en
cada extremo de la carcasa. Este montaje separado previene de
posibles cortocircuitos de la señal a altos niveles de volumen. El
terminal positivo está marcado con un punto en la carcasa. Un punto
rojo indica que la impedancia del altavoz es de 8 ohmios, y un punto
violeta que es de 4 ohmios.

INTRODUCCÍON

Los woofers RF Punch XLC son una gama completa de drivers de baja
frecuéncia que comprenden diámetros de 8" a 15". Los Woofers RF
Punch XLC fueron diseñados para su utilización en caja cerrada o
bass-reflex mediana. Diseñada para ofrecer la máxima calidad, los
Woofers RF ofrecen al entusiasta principiante en sistemas de car
audio, la oportunidad para disfrutar de un bajo sólido en las bajas
frecuéncias. Nuestros ingenieros han seleccionado materiales y
técnicas para la construcción de nuestros altavoces con el objetivo
de ofrecer características y confianza comparable a otros altavoces
vendidos much más caros.

TERMINALES DE ENTRADA

– 10 –

Para un buen funcionamiento las paredes del recinto han de ser
rigidas y sin flexión a altas presiones de aire. Recomendamos usar un
espesor de 1.9 cm de conglomerado de alta densidad o fibra de
media densidad. Si el recinto es muy grande es necessario reforzarlo
internamente. Las juntas deben ser encoladas y aseguradas con
tornillos o grapas. Internamente las juntas deben ser selladas con
silicona para prevenir las fugas de aire. La cola para madera es la
mejor opción. Debido a la porosidad del conglomerado de alta
densidad y la fibra es recomendable sellar exteriormente la caja con
poliuretano.

CONSTRUCCION DE UN RECINTO

CALCULO DEL VOLUMEN

Para calcular el volumen sólo se han de medir las dimensiones en
centimetros y aplicar la fórmula:

Volumen du
la caja =

Si dos caras opuestas son de diferente tamaño, súmelas y divida el
total por dos para obtener el promedio. Usando esta técnica se
ahorrara el cálculo por secciones. El espesor del material con que está
construida la caja reduce el volumen interno, de manera quer ha de
restarse de las dimensiones exteriores para determinar el volumen
interior. La cantidad de aire que ocupa cada modelo viene especificado
en la hoja de caracteristicas y también debe sustraerse para obtener
el volumen neto interior.

1000

Alto x Ancho x Profundidad

(en litros)

E

SPAÑOL

– 11 –

VEUILLEZ LIRE LES INSTRUCTIONS SUIVANTES POUR L'INSTALLATION
DE CE PRODUIT.

Les bornes positives et négatives sont fixées de part et d'autre du
saladier. Cette séparation permet d'empêcher les courts-circuits entre
les fils lors des reproductions sonores élevées. La borne positive est
repérée par un petit point de couleur sur le saladier. Un point rouge
est utilisé pour les haut-parleurs de 8Ω, un point violet pour les haut­parleurs de 4Ω.

INTRODUCTION

Les woofers RF Punch XLC sont une gamme complète de haut­parleurs de graves allant de 20 à 46 cm et disponibles en 4Ω ou 8Ω.

Les woofer RF Punch XLC ont été conçus pour être utilisé de
préférence en enceintes closes.

En utilisant les techniques et les matériaux de construction les plus
récents, nous sommes parvenus à construire un haut-parleur
fournissant un rendement élevé dans les graves tout en requérant un
volume opérationnel minimum.

BORNIERS

– 12 –

Pour fonctionner convenablement les parois du caisson doivent être
rigides lorsqu'elles sont soumises aux hautes pressions dues au
fonctionnement du haut-parleur. Nous vous recommandons d'utiliser
des panneaux de bois aggloméré à haute ou moyenne densité de
particules de type “MDF”. Ces panneaux sont disponibles dans la
plupart des magasins de bricolage. Pour un caisson de grand volume
il est recommandé de placer des renforts à l'intérieur du caisson. Les
différents côtés devront être collés (colle à bois) et vissés (ou
éventuellement cloués). Il est recommandé de mettre un joint de
silicone dans les arêtes internes du caisson afin d'éviter les fuites
d'air. Du fait de la porosité des matériaux que nous vous conseillons
il est préférable de recouvrir l'extérieur du caisson avec du
polyuréthane.

CONSTRUIRE UN CAISSON

CALCUL DU VOLUME

On calcule le volume en mesurant la dimension de chaque côté et en
utilisant la formule suivante:

Volume du
caisson =

(Litres)

Si les due côtés qui se font face n'ont pas la même longueur,
additionnez les et divisez le résultat par deux pour obtenir la
moyenne des deux longueurs. Utilisez le nombre ainsi obtenu dans
la formule pour déterminer le litrage. Cette méthode permet d'obtenir
le volume du caisson sans devoir faire de calculs compliqués de
section de volume. L'épaisseur du matériau dont est fait le caisson
réduit le volume interne de celui-ci. Lorsqu'on mesure les côtés du
caisson il ne faut donc pas oublier d'oter des mesures l'epaisseur du
matériau. Le haut-parleur lui-même diminue le volume interne du
caisson. Le volume d'air déplacé par chaque modèle de haut-parleur
est repris dans les spécifications techniques et doit également être
soustrait du volume total.

1000

Hauteur (cm) x Longueur (cm) x Largeur (cm)

F

RANCAIS

– 13 –

ANSCHLU

ββ

ββ

βTERMINALS

BITTE LESEN SIE DIESE GEBRAUCHSANLEITUNG ZUERST SORGFÄLTIG
DURCH. DAS KANN SIE VOR FALSCHEM EINSATZ, AUSFALLEN ODER
SOGAR BESCHÄDIGUNG DES PRODUKTES ODER IHRES FAHRZEUGES
SCHÜTZEN.

EINLEITUNG

Die RF-Punch XLC Woofer sind eine komplette Produktlinie von Tief­Frequenzlautsprechern mit Durchmesser von 20 cm bis zu 46 cm,
erhältlich in der Impendanz 4 - und 8 Ohm (Die RF Punch XLC
Woofer wurden vorwiegend fur den Einsatz in geschlossenen Gehäuse
konstruiert). Durch die Verwendung neuester Materialien und
Produktionstechniken können wir Ihnen heute einen Lautsprecher
vorstellen, der hohe Lautstärken und tiefe Frequenzen selbst in sehr
kleinen Volumen reproduzieren kann.

Die Anschluβterminals wurden auf jeder Seite des Lautsprecherkorbes
positioniert um eventuelle Kurzschlüsse auch bei hoher Leistung
auszuschlieβen (Das Positiv-Terminal ist durch eine Farbmarkierung
gekenzeichnet). Eine rote Farbamrkierung befindet sich immer bei
einem Lautsprecher mit einer Impedanz von 8 Ohm, eine violette
Farbmarkierung zeichnet die Lautsprecher mit der Impedanz 4 Ohm.

– 14 –

D

EUTSCH

Um das Gehäuse so präzise wie möglich zu bauen, sollten die
Gehäusewände sehr steif und luftundurchlässig sein, um dem
entsehenden Luftdruck des Lautsprechers standhalten zu können.
Wir empfehlen 1,9 cm mittelverdichtete Faserplatte (MDF), die in
den meisten Baumärkten angeboten wird. Bei einem gröβeren
Gehäuse sollten Sie Versteifungen durch Holzbalken montieren.
Diese sollten – wie auch das gesamte Gehäuse – mit Holzleim
geklebt und verschraubt oder vernagelt sein. Um eine höhere Dichte
zu erreichen, empfiehlt es sich, die Kanten und Verschraubungen
mit Silikon abzudichten und das Gehäuse von innen mit einer
Hohlraumversiegelung zu behandeln.

DER GEHÄUSE BAU

VOLUMEN-BERECHNUNG

Zur Volumen-Berechung benötigen sie die genauen Maβe und
Dimensionen in Zentimetern.

Gehäuse­Volumen =

Sollten zwei gegenüberliegende Seiten ungleich lang sein, so können
sie die Maβe zusammen rechnen und durch zwei dividieren um den
Durchschnitt zu erhalten. Dies macht Ihnen die Berechnung leichter
und Sie müssen das Gehäuse nicht in Sektionen berechnen, die Sie
danach wieder mühselig zusammen zählen müssen. Die Materialstärke
beeinfluβt natürlich auch das Innen-Volumen, so muss für eine
präzise Berechnung die Materialstärke von Auβen-Volumen
abgezogen werden. Der Lautsprecher verringert ebenfalls das Innen­Volumen, auch er sollte natürlich heraus gerechnet werden. Jedes
Lautsprecher-Volumen ist unter “Specifications” genau aufgelistet.

1000

Höhe (cm) x Breite (cm) x Tiefe (cm)

(Kubik Liter)

– 15 –

LEGGERE CON ATTENZIONE LE SEGUENTI ISTRUZIONI PRIMA
DELL'INSTALLAZIONE DEL PRODOTTO.

I connettori di ingresso positivi e negativi sono montati sul cestello in
posizioni speculari. Il montaggio separato impedisce al segnale
musicale di cortocircuitarsi ad altissimi livelli di volume. (Il terminale
di ingresso é indicato da una marcatura colorata sul cestello.) Un
contrassengno rosso indica che l'impedenza dell'altoparlante é 8
ohm, il contrassegno viola é impiegato per i 4 ohm.

INTRODUZIONE

I woofer RF Punch XLC sono una linea completa di altoparlanti per
basse frequenze con diametri che vanno da 20 a 46 cm e disponibili
sia a 4 che a 8 ohm. (I woofer RF Punch XLC sono progettati per il
funzionamento principale in cassa chiusa.). Impiegando le piú
aggiomate tecnologie e materiali, siamo in grado di offrire altoparlanti
che possono riprodurre un'elevata pressione sonora alle basse
frequenze mantenendo i volumi di impiego assolutamente ridotti.

CONNESSIONI DI INGRESSO

– 16 –

Per ottenere le prestazioni massime, le pareti della cassa devono
essere rigide e non flettere sotto la sollecitaxione della elevata
pressione generata dal woofer. Noi raccomandiamo l'impiego di
MDF con uno spessore minimo di 19 mm, materiale facilmente
reperibile in tutte le falegnamerle. Per casse di dimensioni molto
grandi é indispensabile prevedere dei rinforzi interni. Le giunture
devono essere incollate e fissate con viti o chiodi in abbondanza.
Intermanmente le giunture devono essere siliconate per impedire
trafilati d'aria. Anche la colla da legno funziona bene. Essendo il
MDF un materiale poroso si consiglia di sigillare l'esterno con
materiali poliuretanici.

COSTRUIRE UNA CASSA

CALCOLO DEL VOLUME

Calcolare il volume é essenzialmente solo un problema di misurazione
delle dimensioni in centimetri della cassa e di applicazione della
formula:

Volume della
cassa =

(litri)

1000

Alteza x Larghezza x Profonditá

Se due pareti parallele sono di dimensioni diverse (prisma),
semplicemente sommatele e dividete il risulto per due. Impiegando
il risultato ottenuto potete calcolare il volume senza dividere la cassa
i sezioni. Lo spessore del legno riduce il volume interno, per cui é
necessario sottrario dalle dimensioni esterne. Anche il volume
dell'altoparlante stesso riduce il volume della cassa e deve essere
sottratto. Il volume che ciascun altoparlante contribuisce a togliere
dalla cassa é indicato nelle tabelle con le specifiche.

I

TALIANO

– 17 –

NOTES

NOTES

05/98
LIT10191

Rockford Fosgate

Rockford Corporation

546 South Rockford Drive

Tempe, Arizona 85281 U.S.A.

In U.S.A., [phone]

In Europe, Fax [phone]

In Japan, Fax [phone]

www.rockfordfosgate.com

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 loudspeaker parts

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