As far as amplifiers go, I am not worried about what an amp is rated for at nominal loads, I want them to make power on my load. Practically speaking, two amps rated at the same power at the same load, are going to deliver power very differently based on how low one can safely wire that amp to minimize reactive load. If one amp wires at .3 and does 4k is more useful than one that protects under .7 but will do 3k at .7 nominal. IA did a great job with these amps as far as making them almost bulletproof. I've wired my 20.1s at .175 ohms, slow Rollin like you wouldn't believe, but they cooperated. On 12V you could probably run them at .25 daily.
I think people back off based on the price tag, and I understand that, but when I went to 14V batteries charging high 17s I couldn't resist trying the IA lineup based on what I heard about their high voltage operation and was baffled at how such a little, albeit heavy amp could make so much power. I immediately bought 3 more.
Fiddling with line driver voltage I got some clamped numbers;
Drop to 16.2V
.72 ohms rise from .21
So in my mind, I think that price tag is reasonable for getting 5k out of it. I think it does close to 6-7k at 19V
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