Hafler 9303, 9505 User Manual
9303 / 9505
PROFESSIONAL POWER AMPL
Installation & Operation
®
®
trans
MADE
IN THE
USA
nova
PROFESSIONAL POWER AMPLIFIER
NOTICE - IMPORTANT SAFETY INFORMATION
The lightning flash with arrowhead symbol within an equilateral triangle
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: TO PREVENT FIRE OR
SHOCK HAZARD, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE.
!
!
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. Do not mount on a carpeted shelf or in a
sealed enclosure. Allow for proper clearance above the equipment.
ment. Furthermore, extension cords or power strips must provide
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
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.
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 equip-
B. Objects have fallen, 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.
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
9303/9505
Full Power Bandwidth: 0.15Hz to 300kHz
Signal-to-Noise: >100dB “A” Weighted
Slew Rate: 150 V/µs
CMRR: 75dB at 1kHz
Gain: +29dB max.
9303
Power Rating: 150 wpc @8 Ω, 225 wpc @ 4Ω, 450 Watts mono @ 8Ω
Distortion: 0.07% THD 20-20Hz, Typically 0.005% THD 1kHz, at rated power into 8Ω
Damping Factor: 800 (to 1kHz); 80 (to 20kHz); 20 (to 100kHz) into 8Ω
Input Sensitivity Range: 1.22 Vrms for 150W into 8Ω, 1.06Vrms for 225W into 4Ω
Dimensions: 19"W x 12-1/2"D x 3-1/2"H (excluding feet)
Weight: 36 lbs. (16.4kg)
Power Consumption: Quiescent, 84 VA; at rated power, 612 VA (150W into 8Ω, both channels driven)
9505
Power Rating: 250 wpc @8 Ω, 375 wpc @ 4Ω, 750 Watts mono @ 8Ω
Distortion: 0.1% THD 20-20Hz, Typically 0.005% THD 1kHz, at rated power into 8Ω
Damping Factor: 1000 (to 1kHz); 100 (to 20kHz); 20 (to 100kHz) into 8Ω
Input Sensitivity Range: 1.58 Vrms for 250W into 8Ω, 1.37Vrms for 375W into 4Ω
Dimensions: 19"W x 12-1/2"D x 5-1/4"H (excluding feet)
Weight: 50 lbs. (22.7kg)
Power Consumption: Quiescent, 132 VA; at rated power, 1020 VA (250W into 8Ω, both channels driven)
– ii –
TABLE OF CONTENTS
SAFETY PRECAUTIONS........................................................................................................................................... i
PERFORMANCE SPECIFICATIONS......................................................................................................................... ii
INTRODUCTION ................................................................................................................................................... 1
INSTALLATION
Location ........................................................................................................................................................... 1
AC Line ............................................................................................................................................................ 1
Input................................................................................................................................................................. 2
Balanced Input: 1/4" Tip Ring Sleeve.......................................................................................................... 2
Balanced Input: XLR................................................................................................................................... 2
Unbalanced Input ...................................................................................................................................... 2
Unbalanced Source with Balanced Input ................................................................................................... 2
Output Connections ......................................................................................................................................... 2
Monophonic Use.............................................................................................................................................. 2
OPERATION
Power Switch ................................................................................................................................................... 3
Balanced/Unbalanced Input Switch.................................................................................................................. 3
Ground Switch ................................................................................................................................................. 3
Mono Switch .................................................................................................................................................... 3
Load Fault Protection........................................................................................................................................ 3
Warm Up ......................................................................................................................................................... 3
Cleaning and Maintenance............................................................................................................................... 3
Schematic Diagram .......................................................................................................................................... 4
PC Board Layout............................................................................................................................................... 6
Parts List ........................................................................................................................................................... 7
9303/9505 Functional Block Diagram .............................................................................................................. 8
TECHNICAL INFORMATION
Theory and Operation of trans•
Circuit Implementation..................................................................................................................................... 9
Calibration ..................................................................................................................................................... 10
Common Mode Rejection ........................................................................................................................ 10
Bias.......................................................................................................................................................... 10
WARRANTY ......................................................................................................................................................... 11
nova ................................................................................................................
9
INTRODUCTION
The Hafler 9303 and 9505 are two channel professional power amplifiers. Passive cooling with large heatsinks
is used 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 9303 and 9505 amplifiers. It 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 amplifiers and how to use them to get the best effect.
The “Technical Information” 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 9303 and 9505 is the latest refinement of our trans•nova (TRANSconductance NOdal
Voltage Amplifier, US Patent 4,467,288) circuit. The 9303 and 9505 utilize our proprietary DIABLO (patent
application in progress) 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 used with
these models, DIABLO yields lower high frequency distortion without the sonic penalties associated with
increasing the negative feedback.
The 9303 and 9505 have 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. Using state-of-the-art surface mount assembly equipment in our manufacturing facility
ensures consistency and reliability.
I NSTALLATION
LOCATION
The 9303 and 9505 can 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, as well.
If the amplifier is mounted in an equipment rack, make sure adjacent equipment does not impede cool air flow
through the amplifier bottom and out the top. The attached feet provide sufficient clearance for the bottom
when the amplifier is resting on a hard surface. Inadequate ventilation can shorten component life, especially
when other equipment raises the ambient air temperature, so a circulating fan should be considered in tight
quarters. The 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.
AC LINE
The 9303 and 9505 operate from a 120 volt, 60Hz AC power line. Connection is made by an 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. Located inside the amplifier 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 included in the
parts list in the “Technical Information” section of this manual. If the replacement fuse blows, this is an
indication of a fault with the amplifier. Servicing should be performed only by a qualified technician.
– 1 –
Loading...