Question about Clarion APX201.2 Car Audio Amplifier

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Power up boom

When my amp turns on it booms the subs very loud, is very annoying and wondering if there is a way to fix this, have had hooked up in different vehicles and different recievers so must be a setting on amp?

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The turn-on "boom" is caused by the amp getting the remote turn-on signal too soon after the head unit turns on. Most amps need a bit of a delay between them for the internal circuits to stabilize. Some amps have a built-in muting circuit that creates its own delay, but some do not. It looks like you have one of two options:

  1. Buy a pre-built delay module, like these ones.
  2. Build your own delay circuit with instructions from here.
Hope that helps!

Posted on Mar 05, 2008

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Is your gain all the way up? If it done this before, sounds like your over working the amp. Make sure your subs ohm load is capable with the amp load to. If they are 1 ohm and your amp is only 2 ohm stable, it would beat for a lil bit then go into protection mode to. Check your wires too.

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your problem could be in the fact that you are trying to overdrive the amp. sony will not carry a 1 ohm stable load and if your speaker are 4 ohm speakers wired in series then you cant drive the bass your looking for. try using soundstream tarantula amp or new hifonics block mono class d amp with about 1000 watts rms. what kicker subs do you have? that will also make the difference in amp choice. im running tarantula on 4 polk momo 4 ohm 12's and has broke my back glass in my jeep twice one time was for a show. oh well let me know. happy boom boom. i'll be glad to help

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If the amp produces no boom with no signal input cables connected, I'd suggest using an LOC.

Let me know if you have any other questions.

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It sounds like you have an open shield ground. To check the shield in your head unit, read through the following page.

Temporary Shield Ground Repair

Let me know if you have any other questions.

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it sounds like you have the high lvl inputs on the amp hooked up instead of the rca's. this will cause the boominess for a few seconds when the amp is on and right when you turn it off

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  • Remove the RCA preout connections from the amp. If the problem is still there, we know it's the amp, not the head unit.
  • Check your gain settings. Set them to 50% and see if that affects the issue at all.
  • Check that your ground wire is nice and short.
  • If the issue is still there, it's possible it's internal to the amp and will need repair.

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