AVS Forum Special Member
Join Date: Mar 2007
Location: Pac NW, Seattle area
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Hello folks, I'm getting ready to upgrade my amps, but I'm confused as to how much amp power I can put on a 20A curcuit. I currently have a pair of Buttkickers and a Marantz SR 8500 (as well as TV, DVD player, SMS-1, cable box) on a single 20A curcuit (but on more than one outlet). This 20A curcuit is the only one on my downstairs room where the theater is (I think the whole downstairs is on this curcuit). The only time I've tripped the breaker so far is when the wife turned on the washer while I've had the HT running pretty loud, plus a small space heater running.
I'm wanting to replace the Buttkickers with a CE4000 or perhaps a QSC PLX series amp, and I want to run an external amp for my front and center speakers, while continuing to use the SR8500 to power my surrounds. However, I don't know how to figure out how much power I can put on that circuit. According to the Crown website, a 30% duty cycle seems applicable to my usage (I don't think I've ever clipped my Buttkickers). What I'm wondering is: If a given amp is listed at say 15A maximum power consumption, but say 6A normal '1/8 power pink noise', do I need to assume it'll need 15A on a given curcuit, or am I OK assuming 6A (maybe 8A for wiggle room?). I understand that 90+% of the time, most amps are hardly working at all.
Someone please explain how amp power consumption works! Thanks!