All of a sudden, last weekend, my inboats started sounding terrible. Lower volume, distortion, muffled etc... I heard it happen all at once. The amp is powered up and not in protect mode. The tower speakers and sub work as usual. I basically turned down the volume on my eq and continued with the day. Fried amp I guess? Any insight on what might be the problem? I don't typically run them too hard because you can't really hear them very well when the music is up loud. I usually have the volume less than half way on my eq for the inboat speakers.

4 Rev 8 tower speakers w/ ht2 amps
6 xs65i's inboat speakers w/ ht6 amp
1 soundstream T7.124 sub w/ soundstream P1.1200D amp
WS-420SQ eq