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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Posted on Jan 02, 2017

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2 12" subs + 600W amp. Turn on, goes boom once, then red light


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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It sounds like there is a DC bias with the switching and they did not design a good fade in and out when switching... If this is original, chalk it up to BAD design.

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i would check your sub connection also make sure the volume isnt set to high. sometimes unplugging the power and cables also helps

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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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BOOM SOUND AT AUDIO MODE CHANGE


Suggest turning the volume down on the Receiver/Amp before changing modes. Changing modes can produce signals that can hurt speakers if driving at mid-high levels.

Regarding the sub, turn off the receiver first, then turn off the sub. When turning everything on, turn on the sub first, then the receiver. If you still hear the noice in the sub, turn down the volume in the sub before turning it off (making note of what volume level you prefer for it when it is on).

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