It probably wipes out all the AM radios for you and the neighbors as well.
The upscale Lutron dimmers (more than $30, eg. Diva) have RFI suppression that's
enough to spare the neighbors, and might spare the guitar amplifier since it's
not an AM radio.
I'd send it back myself, as unacceptable engineering. It's not as if it's a
that they'll make noise or how they have to suppress it. They just don't care.
Number of complaints = x% and they find they can make a profit at that rate
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