Robert, yes it's certainly understandable that you've finally had it with the EP600 amps. I'm really not enthusiastic about class D amps switching several hundred thousand times a second and wouldn't consider one for a separate amplifier. But I do have to point out that my EP500, a month short of six years and approaching 15,000 hours of play, has been trouble-free.

Possibly Brent can shed some light on the problem with the returned amps.

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Enjoy the music, not the equipment.