Alesis 520 M1 Active Studio Monitor - Needs Repair but Working.

This Speaker works and but has an intermittent fault where it suddenly sounds very ‘middley’ and therefore it needs repair. I believe it’s do with one of the switches on the back as previously holding it in place seemed to restore full range audio.

Im sure it’s a straightforward fix but I have neither the time nor the skill to fix this, so I’m selling it as partially working but needing a repair. Supplied with power lead.

N.B I am have a fully working one of these speakers - please see my other listing.