- Sep 8, 2012
A Phase Linear 700 series II amplifier; single channel driven at 1kHz into 8 ohms at 1% THD should be around 510-515 watts. Both channels driven at 1kHz into 8 ohms at 1% THD should be around 440 watts. Both channels driven at 1kHz into a 4 ohm load at 1% THD will be close to 700 watts. NOTE: According to my Monster Power AVS2000 display indication; under the conditions noted above for both channels driven into 8 ohms, the current draw is around 9.82 amps, and for 4 ohms is around 16 amps. NOTE: For both channels driven into a 4 ohm load you will need to increase the line fuse from 10 amps to at least 15 amps and the line supply cord should be 15 Amps as well. (NOTE: I have seen some modified 700 series amps with 10A line cords installed.) Fortunately the ABC15 fuse I used did not blow during this round of tests. The AGX fuses will also need to be increase from 5 amp to 8 amps as well. When testing at 4 ohms, particularly at 20kHz you run the risk of blowing the Zobel network resistors which are (2) 2 watt 10 ohm resistors in parallel for an effective 5 ohms. Clair Brothers discovered this themselves and insisted that Phase Linear use 5 ohm 50 watt resistors.