The voice coil on the cube speakers must be scraping against the magnet.Or the speaker cone must be damaged causing it to flutter at low frequency where there will be large cone movement. Try removing the phono jack from your musical instrument/ guitar and touch the tip of the jack with your finger. You will hear a hum, now turn down the volume and listen to the speakers very closely and see if you can identify the flutter. All the same you will have to fix the speaker or replace it. Have you ever dropped the speakers, if so the speaker frame could have warped causing the scraping noise.
I hooked up my amp and touched my finger the the exposed end of my 1/4" input and i swept the volume from high down to 0, and there was no flutter that I could hear. I have never dropped my amp. If its the voice coil on the magnet is there a easy way to fix it, or would i be better off getting a new amp?
If its the voice coil or magnet all you have to do is replace the speaker, but if you hear no flutter the speakers are OK.
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