HY­BRID DIG­I­TAL

Sound + Image - - Nad -

NAD’s ‘Hy­brid Dig­i­tal’ am­pli­fi­ca­tion, har­nesses Hypex’s UcD (Univer­sal Class-D) tech­nol­ogy. Un­like the ac­tive dig­i­tal pro­cess­ing used for er­ror cor­rec­tion in Di­rect Dig­i­tal, UcD uses a switch­ing ana­logue am­pli­fier where each driver and out­put stage has such low open-loop dis­tor­tion that the whole cir­cuit is able to achieve self-reg­u­la­tion. In higher level prod­ucts, care­fully man­aged clip­ping is added to al­low high lev­els of con­trol feed­back, bring­ing a dra­matic re­duc­tion in dis­tor­tion across the au­dio band, in ad­di­tion to use­ful load in­vari­ance and high cur­rent ca­pa­bil­ity when backed by a well reg­u­lated (but not too tight) cus­tom switch-mode power sup­ply. This fi­nal con­trol loop is the dif­fer­ence be­tween UcD and the highly-re­garded ‘Ncore’ am­pli­fiers.

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