beat me to it.
really? last year i ran a hifonics brutus 2010d(rms 2000@ 1 ohm) which is over rated, it ran off 1/0 gauge power and ground, dimmed my lights, dropped my volts to 11.8 at idle on big bass hits, now i run 2 pdx m12's rms 1200@4 ohms birth at 1300+, run off of 4 gauge power, i have the same electrical as last year, no alternator upgrade yet, and i sit steadily at 13.8-14 volts with a legit +800 watt increase in power. i have to argue that the pdx amp is very efficientAmp designs like the Alpine PDX, and the JL Slash series, that put out the same power in a range of impedances, is inherently inefficient. This is because their power supplies are tightly regulated. Even Manville Smith of JL Audio has said that efficiency was sacrificed for SQ/performance.
Barring the use of one of the tightly regulated amps like mentioned above, efficiency isn't going to change much (with a few exceptions). Most amps on the market, including Class D's and A/B's, are going to be about 80% efficient at full tilt. Amps = watts/volts. Multiply this by 1.2 to find the approx maximum continuous power the amp you chose will draw.
There really is no such thing as a 1000-1200 watt amplifier that 'wont draw much current'. I guess its a matter of perspective, but somewhere in the neighborhood of 100 amps of current draw is a significant amount in my book. It usually requires at least some sort of work on the charging system to accommodate properly.
80%-85% efficient. Pretty decent efficiency actually. I thought its design was similar to the JL Slash series, but obviously not.really? last year i ran a hifonics brutus 2010d(rms 2000@ 1 ohm) which is over rated, it ran off 1/0 gauge power and ground, dimmed my lights, dropped my volts to 11.8 at idle on big bass hits, now i run 2 pdx m12's rms 1200@4 ohms birth at 1300+, run off of 4 gauge power, i have the same electrical as last year, no alternator upgrade yet, and i sit steadily at 13.8-14 volts with a legit +800 watt increase in power. i have to argue that the pdx amp is very efficient