Assuming you're using the Surround Back speakers for their primary purpose, let's establish that there is something in the way of programming being routed to that speaker. Fire up the speaker level setup procedure and use any handy audio device (*) to see if a signal is present at the Surround Back Pre Out jack. If not, that speaker will never, uh, speak.
* For this test you could use your powered subwoofer. You DO have one, right? Just swap the RCA cable from Sub W Pre Out to the SB R Pre Out jack to see if anything appears there.
If you are able to remove the outer metal cover . Some good amps had fuses for the speakers. Worth a try. Pioneer is a decent amp.
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