- Everything would be more simple if you could give us the Amps model and manufacturer information.
-This also enables the search for the user manual. That informs and explains what everything does. - It would help to know what system (all of them) headunit, speakers etc you have in the car and what are you wanting to do?
But from nothing that is a 4-channel amplifier and you can connect headunit outputs to amplifiers inputs to 1/2 input or 3/4 input, depending of number 2 question above. For what is the end goal.
The rest of settings are Crossover, Low-Pass filter, High-pass filter, Bass EQ, Gain for 3/4 channels.
Mentioned inputs and even Output for another amplifier. Then again same settings for 1/2 channels.
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