Clarion APX401.4 - Manual (Page 4)

4 Channel Power System Amplifier
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The Input Connections are gold-plated RCA Jacks and are labeled as FRONT
RIGHT, FRONT LEFT, REAR RIGHT and REAR LEFT. The Gain Controls
provide a wide adjustment range to accommodate output levels from any
brand of source unit.
•
Gain Controls - Seperate Front and Rear Gain Controls allow you to set the
nominal operating level of the amplifier. The amplifier’s range, 250mV to 2.5V
for RCA inputs or 500mV to 5V for speaker level 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 equalizer, 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.
High-pass/Low-pass Filter Controls
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Freq (Hz) Controls - The front crossover frequency is fully adjustable
between 55Hz and 550Hz. The rear crossover frequency is fully adjustable
between 55Hz and 5500Hz (via the Rear Crossover Frequency Multiplier) for
a wider range of crossover points. Use this feature, along with your speaker
manufacturer’s recommended crossover frequencies, to quickly design a
more advanced system. NOTE: If either of the X-Over Mode Switches is set
to OFF, varying the Freq (Hz) Control will produce no effect.
•
Rear X-Over Frequency Multiplier Switch - When engaged, this switch
increases the crossover frequency of the rear channels by a factor of 10.
Example: If the Freq (Hz) dial is set for 240Hz, pushing in the multiplier
Switch changes the setting to 2400Hz.
•
X-Over Mode Switches - These switches are equipped with 12dB per
octave electronic filters for precise frequency attenuation with minimal phase
distortion. Each filter is activated by sliding the X-Over Mode Switch to either
LP or HP.
•
Output Mode Switches - These switches allow you to set the output mode
for front and rear channels. Stereo output allows full left and right stereo oper-
ation. Bridged Mode uses a single input (Right In) to produce a bridged output
that is useful in high powered systems. L + R (sum mono) allows a stereo
input to be summed into a mono output.
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