Hafler SERIES 9505 User Manual
9505
PROFESSIONAL POWER AMPL
Installation & Operation
®
®
trans
MADE
IN THE
USA
nova
PROFESSIONAL POWER AMPLIFIER
NOTICE - IMPORTANT SAFETY INFORMATION
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING:
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
TO PREVENT FIRE OR SHOCK HAZARD
!
The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the user to the presence of uninsulated
"dangerous 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.
the same three wire grounded 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
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.
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
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.
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 –
PERFORMANCE SPECIFICATIONS
19.00
1.19
12.05
16.94
5.20
®
Series 9505
Power amplifier
True-balanced JFET input
9505
Power Rating: FTC (20Hz-20kHz, <0.2% THD)
250 wpc into 8Ω
375 wpc into 4Ω
750 w into 8Ω (bridged mono)
Distortion: <0.1% THD, typically 0.005% THD 1kHz at rated power into 8Ω
Signal-to-Noise Ratio: 100dB below rated output from 20Hz-20kHz “A” Weighted
Frequency Response: 20Hz-20kHz, ±0.1dB
Bandwidth: 0.15Hz-300kHz, +0/–3dB
Slew Rate: 150 V/µs
CMRR: >75dB at 1kHz
Input Impedance: 47,000Ω per phase balanced
Input Sensitivity Range: 800mV (@ 8Ω) per phase balanced
690mV (@ 4Ω) per phase balanced
In/Out Gain: +29dB maximum
Damping Factor: 1000 (to 1kHz); 100 (to 10kHz); 20 (to 100kHz)
Power Consumption: 160W / 2A @ 120VAC (Idle Power)
(Both Channels Driven) 370W / 4.2A @ 120 VAC (1/8 Power – 8Ω)
840W / 8.8A @ 120 VAC (Max. Power – 8Ω)
Controls & Switches: Front Panel Power Switch
Indicators: Line Power LED
Connectors: XLR & 1/4" combo input
Gold-plated RCA input
5-way Binding Post output
IEC Standard Line input
Dimensions: 19"W x 12-1/2"D* x 5-1⁄4"H (3-rack spaces)
(48.26cm x 31.75cm x 13.34cm)
*plus 1" (2.54cm) for handles
Net Weight: 50 lbs. (22.68kg)
– ii –
TABLE OF CONTENTS
SAFETY PRECAUTIONS........................................................................................................................................... i
PERFORMANCE SPECIFICATIONS......................................................................................................................... ii
INTRODUCTION ................................................................................................................................................... 1
INSTALLATION
Front/Rear Panel View ...................................................................................................................................... 2
Location ........................................................................................................................................................... 3
AC Line ............................................................................................................................................................ 3
Input................................................................................................................................................................. 4
Balanced Input: 1/4" Tip Ring Sleeve.......................................................................................................... 4
Balanced Input: XLR................................................................................................................................... 4
Unbalanced Input ...................................................................................................................................... 4
Unbalanced Source with Balanced Input ................................................................................................... 4
Output Connections ......................................................................................................................................... 4
Monophonic Use.............................................................................................................................................. 4
OPERATION
Power Switch ................................................................................................................................................... 5
Input Switch ..................................................................................................................................................... 6
Ground Switch ................................................................................................................................................. 6
Mono Switch .................................................................................................................................................... 6
Load Fault Protection........................................................................................................................................ 6
Warm Up ......................................................................................................................................................... 6
Cleaning and Maintenance............................................................................................................................... 6
PC Board Layout............................................................................................................................................... 7
Schematic Diagram .......................................................................................................................................... 8
Parts List ......................................................................................................................................................... 10
9505 Functional Block Diagram ..................................................................................................................... 12
TECHNICAL INFORMATION
Theory and Operation of trans•
Circuit Implementation................................................................................................................................... 13
Calibration ..................................................................................................................................................... 14
Common Mode Rejection ........................................................................................................................ 14
Bias.......................................................................................................................................................... 14
WARRANTY ......................................................................................................................................................... 15
nova ..............................................................................................................
13
INTRODUCTION
The Hafler 9505 is a two channel professional power amplifier using passive cooling with a large heatsink for
low mechanical noise. Our patented trans•nova circuit topology and MOSFET output stage ensures trouble- free, long term operation
and is backed by our seven year warranty.
This manual contains information on using the 9505 amplifier and is organized into three main sections. “Installation” covers the
location and connection of the amplifier in the system. Like many precision components, careful attention to the initial setup can
yield dividends in higher performance and trouble-free use. “Operation” covers the controls and features of the amplifier and how
to use them to get the best effect. The “Technical Reference” section contains information on the circuit implementation and the
schematic diagram and parts list. We strongly urge reading over the Installation and Operation portions of this manual before putting
the amplifier into service.
The circuitry used in the 9505 is the latest refinement of our trans•nova (TRANSconductance NOdal Voltage
Amplifier, US Patent 4,467,288) circuit. The 9505 utilizes our proprietary DIAMOND (patent pending) transconductance driver
stage which combines the linearity of Class A operation with the current headroom of a Class B system. When used in combination
with the robust output stage featured in this model, DIAMOND yields lower high frequency distortion without the sonic penalties
associated with increasing the negative feedback.
The 9505 has fully differential inputs for use in balanced line systems. The balanced input terminals work with
either 1/4" TRS phone or XLR plugs. Gold-plated RCA phono jacks are available for use with unbalanced source
components. The output terminals are gold-plated binding posts, spaced on 3/4" centers for use with dual
banana plugs. For high power applications, the amplifier can run in bridged mono for double the output
voltage.
– 1 –
®
Series 9505
Power amplifier
True-balanced JFET input
CHANNEL 2
MONO OUTPUT: Use CH 1 Input Only.
CHANNEL 1
CH 2
120 VAC
60Hz
1800W MAX
Audio GND
Chass. Float
Phone Connections
CHANNEL 1
Mono 2 Ch
Unbal.
Bal.
A Division of Rockford Corp.
Tempe, AZ 85281 U.S.A.
Made in the U.S.A.
CH 1
(Mono)
+–
CHANNEL 2
4-8Ω
CHANNEL 1
4-8Ω
PUSH
PUSH
XLR Connections
3
21
+
–
Mono
–
+
®
230 V~
50/60Hz
662W
T8A 250V
MODEL 9505CE
Front Panel View
Rear Panel View
– 2 –
I NSTALLATION
LOCATION
The 9505 power transformer can generate a substantial magnetic field, so caution should be exercised in the
placement of low level components such as a tape deck, mixer or mic preamp to avoid inducing noise in the low
level circuitry. The amplifiers can also produce considerable heat in normal operation so the primary consideration
when determining a location for the amplifiers is to allow for adequate ventilation. The large heatsinks provide
unrestricted airflow, but care must be taken to keep the slots in the bottom panel and top cover clear. If the amplifier
is mounted in an equipment rack, make sure adjacent equipment does not impede cool air flow.
Rack systems should have two fans 4" to 5" in from the front of the amplifier blowing upward.
!
Los sistemas empotrados en gabinetes (rack), deben tener dos (2) ventiladores soplando hacia arriba, ubicados
!
de 10 a 12.5 ctms. detrás del frente del amplificador.
Les chaines stéreo Rack devraient avoir deux ventillateurs placés à 4 ou 5 centimètres, en face de l'amplificateur.
!
Rack Systeme sollten zwei eingebaute Ventilatoren haben, die Luft von oben auf den Verstärker leiten. Die
!
Ventilatoren sollten ca. 10-20cm hinter der Front des Verstärkers angebracht werden.
Per i sistemi ad armadio sono necessari due ventilatori direzionati in su collocati dai 10 ai 13 centimetri davanti
!
all'amplificatore.
Inadequate ventilation can shorten component life, especially when other equipment raises the ambient air
temperature, so circulating fans should be considered in tight quarters.
4" to 5"
(from fan center)
(Bottom View)
Fan center approximately in line with edge of unit and starting of heatsink fins
• Fans placed 4" to 5" from front of unit
• Fans placed under the unit pointing upwards
• Recommended 9505 fan is 50cfm x 2
AC LINE
The 9505 amplifier operates from a 120 volt, 60Hz AC 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. Mounted on the rear panel is the line fuse which interrupts the power to the amplifier. If this fuse blows
replace it only with the same type and rating fuse. The correct replacement fuse value is printed on the rear panel
of the amplifier. If the new fuse blows, this is an indication of a fault with the amplifier. Servicing should be
performed only by a qualified technician.
– 3 –
UNBALANCED INPUT
The unbalanced inputs use conventional RCA phone jacks. Set the BALANCED/UNBALANCED switch to the
UNBALANCED position to use these jacks.
BALANCED INPUT
The input jacks located on the back of the amplifier are dual function connectors which accept 1/4" Phone (Tip
Ring Sleeve) or XLR plugs. The 1/4" Phone jack is connected according to conventional usage. The XLR jack is
connected according to the IEC and AES standard.
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
+
SHIELD
OUTPUT CONNECTIONS
The speaker output connectors are dual binding posts. These binding posts will directly accept 12 AWG wire
or banana plugs and are spaced on 3/4" centers to accept dual banana plugs.
MONOPHONIC USE
For systems with high power requirements, the amplifiers can be configured for single channel bridged mono
operation. To bridge the amplifier, set the rear panel Mono/2 Ch switch to the Bridged Mono position. Only
the Channel 1 input and level control is used. The speaker is connected to the RED output binding posts.
– 4 –
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