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1. Main Volume: This knob controls the volume level of your Front
and Rear outputs. It is recommended that you set your radio
volume at the desired listening level and make your sound
adjustments from your equalizer.
2. Fader: This knob will allow you to fade the signal level between
your Front and Rear outputs. This will allow you to have Front
and Rear fading capabilities with only one pair of inputs.
3. Dual Input Selector: This button allows you to select the input
signal from either your main Head Unit or Aux Input.
4. Input Voltage Selector: On the top of the AP-4EQ is a switch
to select either Low Level RCA Input (left side position) or High
Level Speaker Input (right side position). The High-Level input
allows you to connect speaker outputs from our factory radio to
the equalizer without the need of a high to low level converter.
5. Subwoofer Frequency: This knob allows you to select the
center frequency range of your subwoofer output from 40Hz to
150Hz.
6. Subwoofer Volume: This knob controls the volume level of your
Subwoofer Output and is independent from the Main Volume
knob.
7. Equalizer Knobs: These 4 knobs allows you to control the Bass
(75Hz), Mid-Bass (500Hz), Midrange (2.5kHz) and High (10kHz)
frequencies with a 18dB of defeat or boost.
8. Auxiliary Input: This 3.5mm input jack allows you to connect
your phone or portable audio player directly to your equalizer. Be
sure to select Aux input mode when in use from the front
panel button.
Front Panel Controls
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