Pool and Spa
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Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, the prescribed check would require a multi-meter set to its Ω function. Each speaker should show a reading of at least 2 Ohms. Then from the speakers, the speaker wires should be traced back to the universal harness AQ-UNH-2 and the same Ω checks done on its connector pins.
Please click HERE for the universal harness AQ-UNH-2's pinout (if needed).
If the speaker, its wires, harness and connector checks good, then it would most likely be an internal hardware issue with the AQ-DM-4UBT.
Attempting a DIY (do-it-yourself) repair approach would require access to and familiarity with a multi-meter and even a soldering iron.
I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround; sorry for having to be the bearer of bad news.
Good luck and thank you too for the opportunity to be able to share the information.