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Coddling and all that. In collaboration with Manchester-based semiconductor specialist Zetex, NAD has developed a circuit topology which “corrects even the smallest pulse deviation” by comparing the PCM input signal against an internally generated PWM reference signal. It’s simply about mathematical headroom however.

The concept begs for a bevy of digital inputs and NAD offers five: This review first appeared in the April issue of hi-end hifi magazine fairaudio. Pp-5000 are also coaxial and Toslink digital outputs.

P Accuphase – HiFi-Do McIntosh/JBL/audio-technica/Jeff Rowland/Accuphase

This described an actual occurrence in my digs accompanied by very accelerated heart beat. What confuses matters further is that class D amps are usually fed analog signals even though a few exceptions are driven pp-5000 digital signals.


While digital signal is processed up to 24 bits and analog automatically converted to 24 bits, NAD actually talks of bit math. NAD then warns that “due to its special technologies and high-frequency shielding, the M2 must be plugged into a properly grounded socket, i.

Accuphase P-400 & Luxman C-5000A

Shortly afterwards, the display shows shortcut probably triggered by clippingthen there’s sudden blessed silence. This creates an additional format conversion layer and NAD admits that the digital-direct inputs have a sonic advantage over going in analog.

A calculator with 35 digits will produce more accurate results. While playing with the dB range under signal, accupyase unintentional click too far and all hell breaks loose.

Accuphase P vs. P – which is better (George Mann)? – SFEINST – Amp/Preamp Asylum

All images contained in this review are the property of fairaudio. My 16A AC line created no bottle neck however. Before getting into sonics, two more housekeeping items.

Most of you already know that class D stands for neither class Digital nor means that this class of operation is digital per se. The M2 draws a lot of current which theoretically could challenge your residential circuit breaker system. While the basic operation of this very energy-efficient approach does resemble digital by consisting of just two switch modes of the output devices—on and off like 1 and 0—the more common pulse width modulation technique is actually defined by the duration between switch changes.


It allows additional corrective math just ahead of the speaker outputs. After filtering out the switching frequency components, the outputs of course pass analog signal.


While on power and AC, the M2 reacts audibly to correct power polarity. In the latter case, PCM signal of digital sources like CD or network players connects directly to the amplifier input.

Schuko users should experiment with our bidirectional EU plugs to be sure. Also the M2 was far from happy when sharing a duplex with an idling Fonel Emotion while playing itself. Accuphqse it accepts digit figures, subsequent calculations can easily exceed those digits. At first glance this makes no sense.

The – um, protection circuitry of NAD works reliably.

Envision a basic pocket calculator. Possible errors include pulse amplitude incurred by remaining power supply rippledpulse width and a softening of the pulse edges — all factors with are directly relevant to the quality of the music signal.

Then its outputs are fixed and its volume control bypassed.