I once upon a time I had an amp, which was under one year old and brand new, well reviewed, well respected; (not an Adcom, I love the 535 amp, I still have two of them as back up) which lacked a speaker relay.
Well it was a dark and stormy night (we go .10 inches of rain as I recall) and well to cut to the chase my beloved Spendor BC1 speakers (may they rest in peace) went to rock and roll heaven (well they aren’t rock and roll speakers, but you get the point).
That was 20 years ago, it happened only once, has never happened again. I insist all the amps I buy now have a speaker relays. I was even using a way too cheap, way too old surge protector. One I had bought from Fry’s for 10 dollars 10 years’ prior, which turned out to be a glorified extension cord. I was thinking ya this will protect my speakers, all my gear is in good shape and well maintained. But the deity is in the details.
I hear the speaker relay on my Yamaha M4 and it’s such a wonderful sound to my ears. I know there is a God or at least I know there is ‘Intelligent Design’ somewhere in this universe.
I sure many people roll their eyes every time SoCal Sam talks about speaker relays, but I smile and say the guy really knows what he is talking about. What a winner don’t know a loser understands.
I also have a Kenwood M2a, nice amp but the Yamaha M4 is just so sweet, IMHO.