**I just want to clarify that, while I enjoy a good sounding stereo, I am by no means an audiophile. **
I got this Kenwood KDC-248U head unit for XMas. I installed it in my truck a couple days ago and it worked fine.. until I pumped up the volume. The max volume is 35. I cranked it to about 25 or 26, and after 5-10 seconds, the music began to slowly get quieter, then distroted, and would further distort if I cranked up the volume further. The watts on this unit is 50Wx4 Max and 22Wx2 RMS.
This is the fourth stereo in this truck since I've owned it. Started out with the factory HU, which had a similar problem as this one is having, but it would only happen periodically, never was consistent.. This problem, of course, didn't happen until I swapped out the factory speakers with some Pioneer 3-ways. Can't find the box for em & I can't remember the wattage on them, but I know they were by no means a top-of-line model (IIRC they were ~200W Max and less than 40W RMS). Swapped out the factory crap with a Kenwood KDC-MP735U, which, although a better HU than the one I have now, it has the same power. Ran fine, no problems. Then I swapped that out for a POS Pyle HU, which actually ran fine. Didn't have the best sound quality, but no distortion either. I think it was 45Wx4 Max, don't know the RMS.
I am assuming the speakers are underpowered by the head unit, as that is usually why you would get a distortion like this at higher volumes.. But WHY?! The two other aftermarket HU's didn't have this problem, and I played them a good bit louder than this one thus far. I have triple checked my wiring and everything seems to be fine. Used wire nuts on all connections except the three power wires (two 12V and one ground) which I crimped w/ butt connectors. PLEASE HELP, THANKS!!!