I have two Kicker comp. 12' speakers in a Kicker box with a 600 watt Kicker AMP. The problem is after getting my truck fixed and back from the shop after it being there a month the amp is not pushing my speakers as hard as it once was. I turn my amp through my radio and its dails are set on high and I can barely hear the the speakers in the back seat. I checked all the switches and they seem to be correct the the truck battery is partically new. I am no expert when it comes to stuff like this I had them professionaly installed as well.
Make sure all your connections in your amp are tight, sounds like something is loose, including the ground to the vehicle. If not, tune your interior speakers to the setting that makes them sound the best, leave the sound at that level, then check on the amp and adjust that accordingly to match. If it is not a loose wire, It will either be the amp got turned down, or possibly, check your fuses, both in the amp and in your power cable.
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