What settings should be applied to the KICKER KX400.4 amplifier?

Q: What settings should be applied to the KICKER KX400.4 amplifier?

The main adjustment is the gain (input control) . Set your car radio to about 75% volume, then slowly increase the amplifier gain clockwise until you hear a slight distortion, then reduce it slightly. This step ensures clean sound without clipping. Crossovers (X-OVER) You can set up two independent crossover sections: Amp 1 : Choose OFF, High-Pass, or Low-Pass with a range of 10 to 5,000 Hz (use the x1/x10 switch to adjust) Amp 2 : Select OFF, High-Pass, Low-Pass, or Band-Pass (10-500 Hz high-pass, 40-5,000 Hz low-pass) All crossovers use a slope of 24 dB/octave. Input Level Switch On the back panel, set according to your source: Low level (125 mV to 5 V) : for the low-level RCA outputs of your car radio High level (250 mV to 10 V) : for speaker outputs Bass Boost (KICK EQ) The variable bass boost control offers from 0 to 18 dB at 40 Hz. If you increase the bass, return to the gain control to avoid distortion. Startup Mode Choose between three options: remote start +12 V (recommended), continuous offset detection, or audio signal detection for automatic amplifier activation. Tip: Start with the gain and crossovers turned off (OFF), then gradually adjust from this baseline.

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The main adjustment is the gain (input control). Set your car radio to about 75% volume, then slowly increase the amplifier gain clockwise until you hear a slight distortion, then reduce it slightly. This step ensures clean sound without clipping.

Crossovers (X-OVER)

You can set up two independent crossover sections:

Amp 1: Choose OFF, High-Pass, or Low-Pass with a range of 10 to 5,000 Hz (use the x1/x10 switch to adjust)
Amp 2: Select OFF, High-Pass, Low-Pass, or Band-Pass (10-500 Hz high-pass, 40-5,000 Hz low-pass)

All crossovers use a slope of 24 dB/octave.

Input Level Switch

On the back panel, set according to your source:

Low level (125 mV to 5 V): for the low-level RCA outputs of your car radio
High level (250 mV to 10 V): for speaker outputs

Bass Boost (KICK EQ)

The variable bass boost control offers from 0 to 18 dB at 40 Hz. If you increase the bass, return to the gain control to avoid distortion.

Startup Mode

Choose between three options: remote start +12 V (recommended), continuous offset detection, or audio signal detection for automatic amplifier activation.

Tip: Start with the gain and crossovers turned off (OFF), then gradually adjust from this baseline.

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