Efficiency ratings

[sonic purity 10+ year member]

Anyone know where I can find the efficiency ratings for amps. I know this is a pretty vague question, but any help would be appreciated.

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[lostdaytomorrow 10+ year member]

I've been down this path before.

Unfortunately, almost all companies only rate them at 4 ohms, which is useless if you want 1 or 2 ohm ratings.

 

[audioarsonal 10+ year member]

It all depends on the type of amp you wanna know about.Is it a/b,d class,etc...a/b usually 50-60%,d class usually 70-75% efficient.