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Peak Indicator LED
The peak indicator LED will glow when the output level reaches 6dB below clipping. It is quite common
for the LED to flash on and off during high level operation. However, if the LED remains steadily lighted,
the input level control or the output level of associated equipment should be lowered until the LED only
flashes at the highest peaks.
High Pass Filter Control
This shelving-type filter provides an 18dB per octave rolloff between 120Hz and 15Hz. It is especially
useful for reducing stage or turntable rumble, AC hum, wind noise, and other subsonic components that
waste amplifier power and tax speakers.
Low Pass Filter Control
This is also a shelving-type filter that provides a 12dB per octave rolloff above 8kHz and up to 25kHz. Its
main purpose is to stop high frequency noise, oscillation, and certain types of RF interference from
damaging tweeters. It is also useful in reducing excessive background noise, such as that produced by old
phonograph records.
Input Level Control
This control adjusts the input gain by ±12dB to allow the use of a wide range of input sources. To insure
the best S/N ratio possible, adjust this control so that the peak LED flashes only occasionally.
Equalizer Sliders
These sliders are adjusted to tune or equalized the overall frequency response of a sound system.
Equalizer Indicator LED
The indicator LED turns on whenever the equalizer IN/OUT switch is "in".
Equalizer IN/OUT Switch
Equalizer switch puts the input signals either in circuit or out of circuit of the equalizer except high- and
low-pass filters. The "out" position provides flat audio response no matter what the position of the
equalizer sliders.
Power Indicator LED
The green LED glows when the power switch is "on".
Power Switch
Pushbutton alternately switches the AC power on and off.
Security Cover Stud Screw
The stud screws are provided to mount the smoked plastic security cover, which prevents inadvertent
control changes after all controls are properly set.
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Front Panel