probably too much DC into speaker. 2...3V enough to fry.
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Speakers are 10 years or so old a 2 way puts a lot of stress on midwoofer toss in modern adhesives foams etc many are failing and that maybe a issue I have not noticed any longevity in modern design and it seems that many modern loudspeakers etc are already failing. I have drivers and loudspeakers from 1930s up. In my experience modern designs are not holding up as well and I have had many modern transducers fail while the old ones just keep working. And sad thing about many modern drivers is limited repair-ability most designed to be binned if any issues.
Thank you for the comment, however, as stated I do not play music loud since I live in an apt near neighbors. There are occasions where loud noises do occur. For example, if watching a movie and there is an explosion there is definitely an increase in volume noise and there is a lot of sound distortion. I have an Anthem MRX700 receiver with 120 watts per 7 channels and 8 ohms. The SF Monitor M are 40 -150 watts and 4 ohms. Shouldn’t this receiver be powerful enough for these speakers? If not then is there a booster of sorts (pre amp or pre pro) available to boost the power of the receiver?
If you're clearly hearing distortion you're overdriving the hell out of that amp and that's almost certainly the cause of your problems. Plus, I seriously doubt that amp is delivering 120 watts to a 4 ohm load. It's probably much less than that. AV receivers aren't well suited to challenging loads and that's what those speakers are. Your only option is a power amp that will deliver clean power into at least 4 ohms.