2. home-theater
  3. 178173-1662

Repair service for Revel B15 subwoofer

I have an old B 15 subwoofer that I use as a center channel bass source with my home theater system which is otherwise very modest. I have noticed lately that the woofer is not putting out sound in response to an input signal. The woofer itself seems to be OK. I believe the problem is with the electronics. Does anyone know a service or a shop that has some expertise in repairing the electronic components of this unit? Thanks for any response.

lewm
epping4est
4 posts
 

My two Revel B15a subwoofers have the same [no response to input] problem. If not worth fixing, then what is the 15" driver’s nominal impedance, and what would be an appropriate substitute amplifier?

 

Is there a service manual for the B15As?

Post removed 
epping4est
4 posts
 

The Revel Performa B15a subwoofer employs a class-AB amplifier which can run without a load, which might make one think that the problem could be repaired by shipping only the subs' plate amplifiers to an electronics repair shop. PROBLEM: A B15A's plate amplifier depends on various a/c voltages coming out of a massive transformer screwed and glued to the inside rear of the subwoofer's MDF chassis. i.e. Two choices:

  1. Ship the entire 105-lb unit for repair
  2. Ship just the plate amp to a repair shop that has the cable harnesses and power supplies to deliver the voltages needed by the plate amp.
epping4est
4 posts
 

I'm mistaken, above, in saying that the (toroidal) transformer is "screwed and glued" to the cabinet's insides. In fact, by also removing the very heavy 15" driver, the relatively light transformer can be unbolted and removed:

PXL_20241123_230718238.jpg

So a reasonable fix-it shop should accept the defective plate amplifier for repair along with the toroidal transformer with which to suppy power to the amp.

CAUTION: Due to its extraordinary weight, the 15" driver is best removed when the plate amplifier has already been removed and the cabinet is on its back.

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