9303 / 9505 Installation & Operation ® ® an tr va no s USA IN T E HE MAD PROFESSIONAL POWER AMPLIFIER AMPL NOTICE - IMPORTANT SAFETY INFORMATION CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ! ! 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. 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 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. WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. 1. READ INSTRUCTIONS All the safety and operating instructions of your Hafler equipment should be read before power is applied to the equipment. RETAIN OWNER'S MANUAL These safety and operating instructions should be retained for future reference. HEED WARNINGS All warnings on the equipment and in the operating instructions are important and should be followed. FOLLOW INSTRUCTIONS All operating and use instructions are important and should be followed. HEAT The equipment should be kept away from areas of high temperature, i.e., heater vents, radiators, stoves/ovens, fireplaces, etc. 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. 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. 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. 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. 2. 3. 4. 5. 6. 7. 8. 9. 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- ­i­ PERFORMANCE SPECIFICATIONS 9303/9505 Full Power Bandwidth: 0.15Hz to 300kHz Signal-to-Noise: Slew Rate: CMRR: Gain: >100dB "A" Weighted 150 V/µs 75dB at 1kHz +29dB max. 9303 Power Rating: Distortion: Damping Factor: 150 wpc @8 , 225 wpc @ 4, 450 Watts mono @ 8 0.07% THD 20-20Hz, Typically 0.005% THD 1kHz, at rated power into 8 800 (to 1kHz); 80 (to 20kHz); 20 (to 100kHz) into 8 Input Sensitivity Range: 1.22 Vrms for 150W into 8, 1.06Vrms for 225W into 4 Dimensions: Weight: Power Consumption: 19"W x 12-1/2"D x 3-1/2"H (excluding feet) 36 lbs. (16.4kg) Quiescent, 84 VA; at rated power, 612 VA (150W into 8, both channels driven) 9505 Power Rating: Distortion: Damping Factor: 250 wpc @8 , 375 wpc @ 4, 750 Watts mono @ 8 0.1% THD 20-20Hz, Typically 0.005% THD 1kHz, at rated power into 8 1000 (to 1kHz); 100 (to 20kHz); 20 (to 100kHz) into 8 Input Sensitivity Range: 1.58 Vrms for 250W into 8, 1.37Vrms for 375W into 4 Dimensions: Weight: Power Consumption: 19"W x 12-1/2"D x 5-1/4"H (excluding feet) 50 lbs. (22.7kg) Quiescent, 132 VA; at rated power, 1020 VA (250W into 8, both channels driven) ­ ii ­ TABLE OF CONTENTS SAFETY PRECAUTIONS ........................................................................................................................................... i PERFORMANCE SPECIFICATIONS ......................................................................................................................... ii INTRODUCTION ................................................................................................................................................... 1 INSTALLATION Location ........................................................................................................................................................... AC Line ............................................................................................................................................................ Input ................................................................................................................................................................. Balanced Input: 1/4" Tip Ring Sleeve .......................................................................................................... Balanced Input: XLR ................................................................................................................................... Unbalanced Input ...................................................................................................................................... Unbalanced Source with Balanced Input ................................................................................................... Output Connections ......................................................................................................................................... Monophonic Use .............................................................................................................................................. OPERATION Power Switch ................................................................................................................................................... Balanced/Unbalanced Input Switch .................................................................................................................. Ground Switch ................................................................................................................................................. Mono Switch .................................................................................................................................................... Load Fault Protection ........................................................................................................................................ Warm Up ......................................................................................................................................................... Cleaning and Maintenance ............................................................................................................................... Schematic Diagram .......................................................................................................................................... PC Board Layout ............................................................................................................................................... Parts List ........................................................................................................................................................... 9303/9505 Functional Block Diagram .............................................................................................................. 1 1 2 2 2 2 2 2 2 3 3 3 3 3 3 3 4 6 7 8 TECHNICAL INFORMATION Theory and Operation of trans·nova ................................................................................................................ 9 Circuit Implementation ..................................................................................................................................... 9 Calibration ..................................................................................................................................................... 10 Common Mode Rejection ........................................................................................................................ 10 Bias .......................................................................................................................................................... 10 WARRANTY ......................................................................................................................................................... 11 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. INSTALLATION 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 cleara ...