Amp issues, need some help....

[Jester1318 10+ year member]

Amp is a crossfire CFA555. When I hook a speaker to the rear L+ terminal and any other terminal the output is extremely low, nearly inaudible (????). But every other terminal seems to be fine. Anyone have any ideas?

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[dB-r 10+ year member]

Bad solder connection inside the amp, or blown output transistors or driver transistors.... Need to have it repaired.