he Phoenix Gold Xenon x100.4 performed well. True to its marketing, the Xenon x100.4 delivers nearly the same power into different impedance loads. On the bench, the Xenon x100.4 delivered
116 watts x 4 into 4 ohms and 112 watts x 4 into 2 ohms. Only in the 1 ohm configuration did the Xenon x100.4 fall a little short. In the bridged mode, the amplifier produced nearly
234 watts x 2 into 8 ohms and 225 watts x 2 into 4 ohms. Again, while close, the Xenon x100.4 amplifier produced slightly below the rated power into 2 ohms, bridged. )Bear in mind that these tests were performed with all channels driven into the respective loads.) When I powered half of the amplifier, the Xenon x100.4 amplifier delivered its rated power into lower loads. The current draw of the Xenon x100.4 was 48.7 amps, 65.5 amps, and 61.8 amps of current into 4 ohms, 2 ohms, and 1 ohm, respectively. This calculates for a maximum 67% efficiency at 4 ohms. At 1/3 power, the Xenon x100.4 delivered 43% to 36% efficiency into the lowest impedance load. This level of efficiency is above average for a Class AB amplifier.Pulled from carsound.com
http://www.carsound.com/articles/publish/printer_413.shtml