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I NTRODUCTION
– 1 –
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.