Circuit diagram of BEHRINGER TRUTH B2030A Active speaker unit.

The speakers could of had quit working and have also died.You could buy new speakers or get the speakers repaired that are broken.

You should contact Behringer customer service directly for the sevrice manual.

Did you buy the second hand and with which gear do youvconnect them

Could be when the power outage the speaker was blown a little. If not check the wire connections.

Unfortunately Behringer equipment is hard to get parts for generically. You may be able to order the whole amp from behringer but I doubt it. I have had lots of problems repairing them for that reason and I will no longer use any of their stuff. The IC's could be repaired but can't find any record or crossover to any of their output transistors. It appears they are custom made for Behringer. Sorry, I can't help any more than that.

Behringer is the only source or an authorized repair facility. I have a site for some of the Behringer stuff, but not this product. They will only release the schematics to their authorized repair people. Getting parts is another whole nightmare.

The fault is not with the speakers... It is with the noisy audio system common in computers. Get a decent USB audio interface and use balanced interconnect cables to solve the problem.

A common problem is the power cord NOT being fully seated... push it in hard. Beyond that, take it in for repair.

A well know problem to the Behringer Truth B2031A speakers is radio interference and noise. I had the same problem with mine and found a solution on a forum!

If you open the speakers, you'll see a cable from the main board that runs to the 2 lights at the front (on/limit LED's). It functions as an antenna... Disconnect it and your speakers are silent, finally. (OK no leds, but I can live with that).

Check the watts and size on your old woofer and go to radio shack and get a repacement woofer with the same wattage and size.
Radio shack make great replacement speakers and woofers.