So i just replaced my head unit and speakers about 5 months ago. Now that it is getting hot the sound becomes muffled. My music will play good until i turn it up as soon as i do that the sound gets faint and i can barley hear it. I had some similar issues about a year ago with the speakers cutting completely out until i turned on and off the car.

But i fixed that by taking the stock amp out and hard wiring the speakers to the head unit. Any suggestions on what it could be. The head unit i have is a pioneer and the speakers are polk audios. I took the middle speakers out so all i have is the two in the door and two in the back were the hatch is. I also have an alpine 600 watt amp and two infinity 10in subs.

Any input would be appreciated thanks

 

I would look at the connections at the speakers first. make sure there is not a freyed wire that is grounding when the speaker is moving more. Did you loop the wiring in the back, or run your own wires? If so check the door jam and grommits for pinching. Could also be one of your speakers is starting to go and the ressistance is freaking out the radio amp.