Dc voltage sent to my speakers

Um, not the one's I've seen especially "high end" amplifiers that pride themselves on not having any.

@erik_squires 

Sounds cringeworthy to me- yikes!

If you want fancy amplifier output protection you need to stick to Class D. 

Not really joking but looking at the Hypex and ICEpower spec sheets they have a lot of fault detection and shut down circuitry built in that most linear amps never even think of.  Maybe the need to target pro sound helps them build paranoia into each amp?

My DIY amp went south a while ago. Not sure if it was the emitter resistor that shorted and caused the output transistor to fail, or vice versa.

Thankfully, I had installed protection boards on the outputs, so speakers were spared.

Had they not been there, the speaker would have been toast.

It’s a 30w class an amp, so there was only around 30vdc, but would have blown the speaker for sure. Rail voltages can go waaaaay high in high power amps, so should something fail, it could get dramatic.

Sorry this happened, a costly episode no doubt.

Should you buy a used amp again, one that doesn’t have DC protection, or some other kind of fuse on the output/rail, then any tech should be able to install DC protection for not very much money.

Some amps are heavily current limited and under low impedance/high output conditions will clamp their output so that the output resembles straight DC or clipping (or a square wave, for that matter). Because this keeps the amps VA output within safe marginsn, nthis is an amp protection scheme, not a speaker protection one. 

Some amps are heavily current limited and under low impedance/high output conditions will clamp their output so that the output resembles straight DC or clipping (or a square wave, for that matter). Because this keeps the amps VA output within safe marginsn, nthis is an amp protection scheme, not a speaker protection one.