Surge protector

@rvpiano If you find a true surge suppressor, make sure to determine if it is A. Resettable or B. Sacrificial. A sacrificial model may self-destruct in the act of saving your equipment. This may become expensive. 

@dweller, none of the Furman’s with SMP are sacrificial though they do include an MOV for a rare edge- case surge. It almost never has a part to play in the surge protection.

Arguably the Zerosurge/Brickwall units are completely not sacrificial, but they also let more voltage through and have one wierd case they don’t cover. I talked to an engineer at length about this, and I’m afraid I forgot the full explanation. SMP, he argued, is a series mode protection with lots of similarities to Brickwall / Zerosurge PLUS an MOV just in case. So long as the SMP does it’s job the MOV never activates.

Bottom line is after the discussions I had PLUS the Wirecutter testing consider the Furman as reliable if not more, and more cost effective.

If you own a Brickwall or Zerosurge already it's an excellent choice and will give you many years of service.  It is only those users who are shopping new that should consider the alternatives.

@rvpiano - Might consider doing 2 things, having whole home surge protection installed at your panel; and also getting non-sacrificial surge protection to plug the equipment into. I use ZeroSurge. I haven’t had any degradation for whatever reason(s) using one in both of my systems , and also with my main TV. And, they aren’t unreasonably expensive $290 for 8 outlets.  I had a Furman, don’t recall the model it cost $150 or so when I purchased it, it went wonky after a while and ruined a 55 inch tv

You absolutely should have one at your breaker box , if you want something very good on a dedicated circuit then go to VH audio great for audio .

if you just want one for the whole house still have installed at the. Breaker box 

Siemens make very good ones for under $250 on Amazon I have one 

plus the top model around $1k from VH Audio , for my dedicated Audio circuit 

and I believe it has power wave form correction ,I have to lookfor the paperwork 

it works excellent the sound sounds improved day or night .

Why don't you just take the amp boards out of the speakers and take them to be repaired? It's probably just a few screws and a couple connectors, and they probably weigh under 10 lbs, not that hard to do.