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• Gain Control - This allows you to set the nominal operating level of the
amplifier. The amplifier’s range, 250mV to 2.5V for RCA inputs, can
accommodate input levels from virtually any brand of source unit.
• Bass Boost Control- The amplifier also features a “high-Q” (i.e. narrow
frequency band) Bass Boost circuit. It acts much like an equlaizer, with
adjustable gain (from 0 to +18dB) fixed at 45Hz. Use this feature to tune low-
frequency audio response to compensate for a less than ideal subwoofer
enclosure design. The added boost produces rich, full bass tones that are
normally difficult to reproduce in the car audio environment. NOTE: If Bass
Boost is undesired, set Bass Boost to 0dB.
• Pass Through - This allows you to “daisy chain” multiple amplifiers by
internally splitting off the RCAinput to the Pass Through output. (The Pass
Through output signal will be identical to the input signal. For example, full
range in equals full range out, 50Hz low-pass in equals 50Hz low-pass out.)
• Power Save - When engaged, the amplifier will automatically minimize the
current drawn while the amplifier is idle or the system volume is at a low level.
This feature increases your amplifier’s efficiency by not drawing unnecessary
current.
High-pass/Low-pass Filter Controls
• Frequency (Hz) Selection Control - The crossover frequency is fully
adjustable between 50Hz and 5500Hz (via the Crossover Frequency Multiplier)
for a wide range of crossover points. Use this feature, along with your speaker
manufacturer’s recommended crossover frequencies, to quickly design a more
advanced system (see Applications on page 5.) NOTE: If the X-Over Mode
Switch is set to FULL, varying the Freq (Hz) Control will produce no effect.
• Crossover Frequency Multiplier Switch - When engaged, this switch
increases the crossover frequency by a factor of 10. Example: If the Freq (Hz)
dial is set for 240 Hz, pushing in the multiplier Switch changes the setting to
2400 Hz.
• X-Over Mode Switch - This switch is equipped with a selectable 12 or 24dB
per octave electronic filter for precise frequency attenuation with minimal
phase distortion. The steep crossover slope keeps midrange tones out of the
subwoofer and thereby eliminates an unnatural “nasal” tone quality in the audio
system. A filter is activated by sliding the X-Over Mode Switch to either LP or
HP.
• Input Mode Switch - This switch allows you to set the input mode. Stereo
input allows full left and right stereo operation. Right (bridged) input allows
single channel input for bridged operation. This is especially useful in high-
powered systems when using one amplifier for each subwoofer/speaker. L + R
(sum mono) allows a stereo input to be summed into a mono output.
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