I couldn't resist getting my hands on one of these AP-15001D's to test out the 1500w claim. I've been around car audio since the late 80's and come from the days when you paid several dollars per watt, while this amp promises 10c per watt!
Those who don't like watching videos, here's my results at 14v:
4 ohms = 504w
2 ohms = 844w
1 ohm = 1115w
I have a complex test bench fitted with wirewound resistors for the ohm loads, (2) 100A 13.8v power supplies "strapped" (showing 14v), SMD DD-1 for 1% distortion measurement, Velleman HPS50 o'scope for visual display of waveform and wattage measurement (or Volts RMS at 1 ohm), Klein Tools CL2000 True RMS Clamp Meter for measuring DC Amperage pull from amp, Fluke 85 III multimeter for verifying ohm loads, 40Hz test tone from DD-1 disc, Yamaha RX-V670 receiver as pre-amp (has large analog volume knob for precise adjustments) and iPod Nano 1st gen with Wolfsen audio chip and DD-1 test tone loaded in Apple lossless format.
I've seen many people "clamp" test this amp and get 1500w or more. Truth is, if you are using a speaker as the load, you must take into account phasing. If you don't know what I'm talking about, see this video by Tony D'Amore, former Rockford Fosgate engineer and the one who developed the infamous T15kW amp.
As I mention in the video, I only tested this amp on the bench with resistors, didn't give it a loaded down subwoofer test. I'll do this in the future and also test 1/2 ohm as many are telling me this amp can handle it. We'll see...
See the video on YouTube in 1080P
or embedded below: