Originally Posted by Sphinx360
4000Wrms? But isn't the limit from my typical 120V 15A AC line about 1800Wrms based on a 100% efficient amp?
Originally Posted by bodhisafa
How is this design capable of these enormous numbers if the amp in only puuting out half of the stated power numbers based on the limits of a circuit. Jeff calculated everything of the 4000Watt estimate but if the amp is limited to just half, then those numbers are not realistic, is this correct or am I missing something?
Can you produce an honest 4000W sine wave for 2 hrs off a single 20A, 120V home circuit? No. Do we ever do this in audio playback? Nope.
If you have the capability to deliver 4000W for a useful duration ranging from 15s to a few minutes, no audio signal you will want to listen to with peaks of 4000W will have an average power of more than 2000W, and more likely less than 500-700W. Circuit breakers are there largely to protect wires from overheating and to protect from fault (short to ground) conditions. They react on a much longer time average than peak audio signals. MANY audio enthusiasts operate systems with 6000W or more on a 20A circuit without popping breakers.
If you are using these in the interest of good sound quality you are generally more than safe if you figure circuit loading at 1/3rd-1/6th maximum audio power, with 1/4 being a good target. If you are running subwoofers very hard for dance use and regularly hitting limiters, clipping amps and running compressed signals, 1/2 maximum audio power is generally plenty safe.
The 4kW amplifier Jeff is using is the same amplifier I'm using in my Terraform XL and some other future products. I've been testing prototypes of the amp for more than 6 months. I see no problem with normal use of a pair of these 4kW amplifiers on a single 20A home circuit.