I had a moderately-priced smart speaker (using the play-fi eco system) with a nice sound, The speaker recently failed. I am generally handy, but with limited electronics expertise. For fun, I disassembled the speaker, assuming that the wifi or mainboard failed. So I extended, then connected, the speaker wires to two different external lower-end "chip" amps. I then connected the amp to an echo dot unit (which I think is reasonably close to the play-fi hardware, but his may be the issue?) for streaming the same Amazon HD music channels as before. Decent, but sub-par sound. So I connected the speaker to an expensive amp, similar result. I have tried several different troubleshooting ideas with no improvement. I realize there a numerous variables, but would appreciate any quick thoughts or ideas, thanks.