Hi Steve,

Whilst the speaker is still connected to the DBT, check for any DC offset on each amplifier output - they should all be very low (< 20 mV). If any are higher, then you need to investigate the associated amplifier section.

If that's OK, I would go for it and plug the board into the mains.

The DBT is likely restricting current to the amplifier, causing voltages to drop and the digital section to become unhappy.

I'm assuming you've re-capped both the comms and amplifier boards?

If you've not re-capped the other speaker, and you're still having issues on full mains voltages, then you could substitute the comms / amplifier boards from the other speaker to see where the issue is and then potentially work backwards (assuming you've not thrown the old capacitors away...)

Drop me a PM if you're still having issues.

Good luck,

Steve

Main: 861v6 (LPS), 808v6, UHD722, DSP8000SE Anniversaries, DSP5200HC, DSP7200.2, SW1600, Sky Q, Cambridge Audio BD, Roon, M80
Office: 861v4 (LPS), 818v3, 800v4, HD621, M&K S150P, DSP5500HC, M&K MPS2810 sub x2
Son's system: 861v4, HD621, DSP6000.2, DSP5k.2C, DSP33, F80
Spare: MCD, 100 Series, 200 Series, 500 Series, C15s.