@cakyol Has any of you ACTUALLY worked with and recommend a SSR which does not introduce any audible distortion on the speaker line and which can operate with a large range of trigger voltages (12 - 48 VDC, may need to have on board voltage regulator for this range). I am building a speaker DC protector and do not want to use electro mechanical relays becoz of DC arcing and contact erosion issues. It needs to be capable of switching up to 15 amps at about 100 volts.Only TRUE engineers reply please.Thanks
Please begin a question without an abbreviation of the most important item.
Solid State relays typically employ SCRs which will have a dead zone at the zero crossing. Try to measure it Its large and will cause a lot of distortion. Crossover distortion is the worst. Rail fuses are your best bet. They are in the feedback loop, and do no harm and no zero crossing.
Other than that a good relay is useful though rail fuses, not speaker fuses, are far better.
BGW used a parallel clamp when DC was detected. The front panel circuit breaker/power switch then opened and all was well. Great solution if your devices can pull the breaker.