I use 3 of their EP-4000 amplifiers to power my subwoofers, and also a DCX-2496 to manage the subs. The thing with the higher powered amps is they have fans which are not quiet. I have the amps I use in the room behind my system thus eliminating the fan noise issue, some have done fan mods to either quiet the fans and some have removed them all together. I have had no issues at all with the three amps I use and they work great powering the subs.
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