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NAD's two different class-D amplifiers


NAD uses two distinct class D sets, Hypex based, in M22 (nCore) and D3020 (lower Hypex amp), and the other one from CSR.

Contrary to some people's beliefs, the "D" in "class D" does not refer to or imply 'digital'

There are digital class D amplifiers, and there are analog class D amplifiers. The central issue is the representation of the signal and feedback in the primary control loop.

For analog amplifiers, digital inputs need conversion to analog before amplification. For digital amplifiers, analog inputs need conversion to digital before amplification. The amplifier performs the conversion to analog, it is a "power DAC".

It would be erroneous to assume either is intrinsically better on all merits.

Hypex amplifiers are analog class D. The Zetex/CSR are digital class D. NAD uses both types depending on the product.

I find my M22 excellent, essentially perfect, for my main speakers, and my D3020 very good within its power limitation.

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  • NAD's two different class-D amplifiers - DrChaos 17:49:54 12/30/17 (0)
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