A general rule of thumb you’ll see in the literature is that, if tweeters blow, the amplifier is too small for the application. When conventional amplifiers are driven beyond their design limit they enter a “clipping” (major distortion) mode that is rich in high frequencies. Relative to bass, normal music does not have much high frequency energy and the distortion caused energy skew damages the tweeter. If an amplifier is too large it is the woofer that usually fails.
AMP is not a “conventional” amplifier because it is designed to not enter the clipping range. AMP will reduce its output or shut down before clipping. If you gave me a job: “please damage this speaker”, I would not willingly attempt this using a SONOS amplifier of any generation. I don’t know about your speaker design, but it is common for modern speakers to include a power limiter in the tweeter circuit. It is difficult to damage a tweeter in such a design.
“200W peak” is a vague spec. for a speaker. Further, since there is no universally used industry standard for assigning speaker power, it is usually the marketing department that assigns the rating. A low number is assigned to low end speakers and higher numbers are assigned to higher end speakers. A meaningful spec. would specify “average” speaker power handling at various frequencies. The public assumes that, if the speaker spec. is higher than the amplifier spec., it will not be possible to damage the speaker. I wish that this was the case.
Unless there is some sort of gross issue with the amplifier, instant speaker damage is unlikely. Your first failure after an hour could be the result of over driving the speaker or a speaker fault. The second, almost instant failure is inconclusive. I’d need to take some data on-site to be sure what is happening here.
Was it proven at the dealership that the tweeters had been damaged? What is the source of your music? Speaker wire will not damage speakers, but damaged speaker wire could cause sonic issues that are then blamed on the speakers.
