Using DD-1 to measure amp output wattage

[WillistonAudioLabs]

I've been using the DD-1 along w/ wirewond resistors and a Velleman HPS50 o'scope/True RMS Volt Meter to measure amplifier output power. Up til now, I've used my results based on the wattage output just before the LED "distortion" light came on the DD-1. I'm curious as to when the DD-1 detects the 1% distortion...is it when the distortion LED light first begins to light up or when the LED reaches a solid red color?

I've decided the 1% THD measurement is a good one for my amplifier output tests and want to ensure I'm understanding the tool properly.

For those who haven't seen my tests, I'll embed a couple of recent videos below:

Rockford Fosgate Punch PBR300x2 Output Test:

MTX "Terminator" MTA 250 Old School Amp Output Test:

Edited April 14, 2012 by BigDWiz

[Hollowstylez]

I like that you tested that 300x1 i think those are sweet little amps. Cool vids man.

[meade916]

forget the amp output test, i am loving the accuracy of the DD-1...i think i even saw one wave that was a little bit crooked, but not clilpped off.......and the distortion light was all over it. Thanks man, i love seeing these vids

[WillistonAudioLabs]

Thanks guys and for those who haven't priced a THD analyzer recently, last I checked they were in the $5k range. Amazing the fact the DD-1 can perform this function in addition to assisting with gain settings. Thanks to Steve for uploading the AD-1 "Amp Dyno" video using the DD-1's technology a few months ago...this gave me the idea to use the DD-1 for my amp tests.