Based on the feedback and my test of the Audiopipe AP-15001D, I decided to bench test the "mini" APSM-1500 to find out how it stacks up against the "premium" version AP-15001D (Audiopipe's claim of premium, not mine, based on their literature) Big thanks to gumby688 for sending me the amp to test.
Those who don't like watching videos, here's my results at 14v:
Audiopipe APSM-1500's Results:
4 ohms = not tested
2 ohms = 840w
1 ohm = 960w
2 ohms: 75A @ 14v = 80% (based on measurement of 840W)
1 ohm 121A @ 14v = 56.7% (based on measurement of 960W)
Since the efficiency dropped so drastically between 2 ohms and 1 ohm (and the power increase was minimal), I decided against the 1/2 ohm resistive test.
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.
*note: the Velleman HPS-50 o'scope was not used in this test as I need to replace the probes, which should be here for my next test...
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 electrical 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.
You can see my previous post showing the AP-15001D's results - Audiopipe AP-15001D Bench Tested for RMS Power Output
See the video on YouTube in 1080P
or embedded below: