Hafler trans-nova P1000, Installation And Operation Manual

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N T R O D U C T I O N
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The Hafler P1000 is a single rack height, two channel professional power amplifier suitable for use in any situation
where a moderately powered compact amplifier is required. The P1000 is particularly attractive for use in broadcast
monitoring situations. Our trans•ana circuit topology and MOSFET output stage ensures trouble-free, long term
operation and is backed by our five year warranty.
This manual contains information on using the P1000 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 Reference” section contains field service information; in addition to the schematic and parts list there
are block diagrams and circuit operation explanations useful for technicians. We strongly urge reading over the
Installation and Operation portions of this manual before putting the amplifier into service.
The circuitry used in the Hafler Professional power amplifiers is our trans• ana ( TRANS conductance A ctive N odal
A mplifier) topology. The trans•ana technology operates the output stage with its full voltage gain, which allows
the input stage to operate from a low voltage regulated supply. The signal is then shifted up in level to the high
voltage section by the driver stage which forms an active node at ultrasonic frequencies. This results in very stable,
highly linear operation.
Safe Area output protection is handled by our proprietary NOMAD ( NO n- M ultiplying A dvanced D ecision, patent
pending) system. NOMAD accurately computes the allowable device current for the device voltage and clamps the
gate drive when the actual current exceeds this value. This improved accuracy is achieved by eliminating the
dependence upon unreliable analog IE multiplier circuits to model the device operation.
Other specialized circuits which prevent damage to the amplifier and speakers have been carefully implemented.
A soft start circuit prevents sending potentially destructive turn-on and turn-off transients to the speakers. A
thermal sensing network continuously monitors the heatsink temperature and shuts down the amplifier to protect
it from excessive operating heat.
Each channel of the amplifier has been built as a self-contained module. This modular arrangement simplifies
construction and improves service accessibility. The circuit board assembly makes extensive use of surface mount
components in the low power portion of the audio circuitry. Automated equipment is used to place and solder the
components which yields greater uniformity and reliability.
The front panel has controls for input level adjustment and the power switch. In addition, LED indicators give a
visual representation of the operating status of each channel. The THERMAL indicator lights to show when this
protection circuit has been activated. The CLIP indicator helps prevent damaging the speaker by showing when
the amplifier is overdriven. The SIGNAL indicator lights to show the presence of an audio signal.