Hi there, I've seen some people fairly accurately read the amps power by going by the amperage of the fuses. I know digital amps make great use of what power their given, but could anybody (that honestly knows what there talking about!)give me approxiamates of power output in relation to the powe input. Like What wattage would 2 X 30 fuses give me for a class A/B amp? [img]graemlins/dunno.gif[/img]

 

Well, that only works if the amp designer is honest with the fusing... I've seen some really crappy amps with huge fuses. With 2 30a fuses you could probably expect a good 100x2 @ 4 ohm out of a class A/B, assuming it's your standard 2 ohm stable amp.

 

well if a/b is about 50% efficient then i think its something like 300watts for 60amp fusing.

so what dodgeram said, about 150 watts per channel

 

My amps have no fuses... does that mean they don't put out any power!?! [img]graemlins/cry.gif[/img]

 

Hmmm... I had a Pioneer premier that did 500rms with 14v fused at 60..

also a Jensen I benched doing more then 400rms and it was fused at 50...

[img]graemlins/dunno.gif[/img]

 

Is that figure of 8-10 watts per ampere at 14 volts or higher Mr. Dave? Are these mostly class a/b amps? What is the efficiency of most class a/b and class d amps that you have tested and at what voltage?

 

A/B amps are usually %50 - %60 near output
saturation (almost clipping)... I think %66 is the theoreical maximum...

An average Class D is %60-75 but some can achieve greater then %90