NAD M2 Di­rect Dig­i­tal

Sound+Image - - Second Decade -

Not only a su­perb am­pli­fier by any stan­dards, but one that brought the hi-fi world closer to ac­cept­ing ‘dig­i­tal’ am­pli­fi­ca­tion, or clever vari­ants of that ilk at any rate, back in a time when au­dio­philes were greet­ing dig­i­tal amps with not so much a raised eye­brow as a raised cross. De­vel­op­ing a fully dig­i­tal cir­cuit ar­chi­tec­ture from Ze­tex (now Diode Ze­tex), NAD de­liv­ered its first ‘Di­rect Dig­i­tal’ am­pli­fier, “es­sen­tially a com­put­er­con­trolled DAC which am­pli­fies”, with dig­i­tal feed­back ac­cu­rately cor­rect­ing tim­ing er­rors in the pulses ev­ery 10 nanosec­onds, this “rein­vented feed­back”, as the en­gi­neers put it, de­liv­er­ing closed loop dig­i­tal am­pli­fi­ca­tion. While NAD now seems to favour Hypex’s Hy­brid Dig­i­tal UcD (Univer­sal Class-D) and nCore ‘dig­i­tal’ am­pli­fi­ca­tion, it’s for this ini­tial brav­ery and suc­cess un­der fire, and for the im­pe­tus it brought to N.A.D.’s Masters se­ries, that the M2 joins our Sound+Im­age Ul­ti­mate 30.

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