Amp Class Ratings?
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Road Warrior
Joined: Jul 2011
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From: Wisco!
Amp Class Ratings?
Can someone chime in on what the amp class ratings mean? I was told by a rep over at Hybrid audio that the arc amp was the way to go being that it was a class Class H or Class G/H rating verses your typical Class D rating apparently class D is not as good?
Thanks
Thanks
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From: OHIO......UGH !!
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From: East of the Sun, West of the Moon
I disagree. Class D amps are great amps and within all the amp classifications a step below Class A and A/B which are the best but are power hungry; the problem is the EMI.
Class-G amplifiers (which use "rail switching" to decrease power consumption and increase efficiency) are more efficient than class-AB amplifiers. These amplifiers provide several power rails at different voltages and switch between them as the signal output approaches each level. Thus, the amplifier increases efficiency by reducing the wasted power at the output transistors. Class-G amplifiers are more efficient than class AB but less efficient when compared to class D, without the negative EMI effects of class D.
Class-H amplifiers take the idea of class G one step further creating an infinitely variable supply rail. This is done by modulating the supply rails so that the rails are only a few volts larger than the output signal at any given time. The output stage operates at its maximum efficiency all the time. Switched-mode power supplies can be used to create the tracking rails. Significant efficiency gains can be achieved but with the drawback of more complicated supply design and reduced THD performance. In common designs, a voltage drop of about 10V is maintained over the output transistors in Class H circuits
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