Rockford Fosgate PA-1HD Owner's Manual page 3

INTRODUCTION
The Rockford Fosgate PA-l HD / PA-1 is an automotive stereo
pre-amplifier which will provide state-of-the-art sound in cars,
vans, boats, or wherever a 9 to 16 volt battery is available.
The Punch adjustable input circuits are designed to match
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almost any music source, from low preamp levels to speaker
levels, with negligible noise.
Three rotary potentiometers control bass, midbass, and treble
equalization circuits specially designed to compensate for the
response errors present in most mobile installations.
Unlike conventional tone controls, the Punch equalization cor-
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rects the specific problems of poor low bass response, mid-bass
bulge, and high frequency rolloff. The result is full-range sound
without excessive boost in areas where it is not needed.