Board repair for subwoofer

After three boards in 5 years, replacing the board with a third party board wouldn’t be unreasonable.  It would just need to fit in the space of the old board, and I would need to find a way to attach it to the panel.  Which brands would you recommend for replacement amplifier circuit boards?  (The current board is a 850 W class D amplifier circuit board.)

How loud do you listen? Do you run demanding levels of EDM music or are you more geared to average listening levels or perhaps classical? Point is you may not need 850 watts of power and can save a bit of $ by downsizing. What size is the driver? What ohm?

@gdaddy1 

I listen to only classical and jazz, and any acoustic music, but at realistic listening volumes.  I think that it’s a few vinyl records that I play that have a low rumble that causes the amplifier board of the subwoofers to detonate.  They are the Martin Logan Balanced Force 212 subwoofers, which have 2 12 inch woofers (drivers); RCA impedance is 10,000 ohms.

Disconnect that board and throw it in the trash.

Call it a passive sub and run it with an external amp such as this one from fosi audio, might be good enough.

https://www.suncoastaudiodirect.com/products/fosi-audio-tp-02-tda7498e-subwoofer-amplifier-receiver-mini-hi-fi-class-d-professional-integrated-amp-for-sub-bass-shakers-220w?_pos=1&_psq=Fosi+tp&_ss=e&_v=1.0

@deep_333 

A problem is that there are two drivers, each with an 850 class D amplifier, in one sealed cabinet.  I would need to get two 850 W amplifiers on the same signal from the pre-amplifier, or some satisfactory combination that could drive both woofers from one RCA line.