HELP! Pioneer H/U Problem!

[MrSplorDie 10+ year member]

Ok, So my Pionner 6000UB H/U has been working fine for months and the other day when having the volume around the 40 range the sound began to distort and die. Now the max volume I can turn the radio up to is around 23-25. Past that range the sound starts to distort and goes lower. Im guessing it has something to do with the H/U because I switched the 4-channel amp and the same thing occurred. Any suggestions as to whats wrong with the H/U?

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