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Board repair for subwoofer

I have a 10 year old Martin Logan subwoofer which has had a chip or capacitor on a circuit board cease to function a few of times.  It seems that the amplifier chip overheats, and just pops.  It has done this three times despite having the sub sonic filter on my pre amplifier.  I don’t want  buy another entire replacement panel from Martin Logan, with the entire set of wires, connectors, circuit boards.  Does anyone know of a diagnosis and repair shop for a circuit board for audio electronics in the US? (I live in central Florida.)

drbond
erik_squires
17,543 posts
 

I think Crown makes some professional amps with built in DSP and crossovers?  If so, that's ideal.  Almost every sub benefits from parametric EQ. 

drbond OP
484 posts
 

@devinplombier 

It seems that most subwoofers are using class D amplifiers these days:  is that because it is better, or because it is cheaper?  Would you recommend the class AB over the class D for subwoofers? (Hoping not to open a can of worms.)

bigkidz
3,504 posts
 

im in new jersey so you would have to ship the unit

drbond OP
484 posts
 

@bigkidz 

Do you evaluate and repair these circuit boards?  I have a board already detached from the plate and power, etc.  Shipping the circuit board (which is only around 5” x 9”) would be quite simple.  What is the name of your business?  Thanks.

gdaddy1
500 posts
 

I wouldn't rule out replacing the sub with a new one. The amps in your sub are matched. If you go with another amp there will be a mis-match. The two speakers will no longer couple properly. 

For all the time, money and effort a new sub seems like a very reasonable option. For your needs a simple SVS or Rel may be a far better choice. 

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