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Then its outputs are fixed and its volume control bypassed. My 16A AC line created no bottle neck however. While digital signal is processed up to 24 bits and analog automatically converted to 24 bits, NAD actually talks of bit math. This gets us to the NAD M2.

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This review page is supported in part by the sponsors whose ad banners are displayed below. This described an actual occurrence in my digs accompanied by very accelerated heart beat. While playing with the dB range under signal, an unintentional click too far and all hell breaks loose. Envision a accupnase pocket calculator. It’s simply about mathematical headroom however. This review first appeared in the April issue of hi-end hifi magazine fairaudio.

After filtering out the switching frequency components, the outputs of course pass analog signal. As is customary for our own reviews, the writer’s signature at review’s end shows an e-mail address should you have questions or wish to send feedback. While the basic operation of p-50000 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.


The M2 has a snazzy display whose text could be a few picas larger however to remain visible from the couch without strain. And in theory, this duration—very non-digital at that—can assume endless intermediate values to not be limited to given samples. It allows additional corrective math just ahead of the speaker outputs. The sound lost luster and drive.

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. We publish its English translation in a mutual syndication arrangement with the publishers. Schuko users should experiment with our bidirectional Accupbase plugs to be sure.

*[ catalog only ] Accuphase P-5000

Shortly afterwards, acccuphase display shows shortcut probably triggered by clippingthen there’s sudden blessed silence. Before getting into sonics, two more housekeeping items. The concept begs for a bevy of digital inputs and NAD offers five: It belongs to the still rarer species of digitally driven class D amplifier which process the signal in the digital domain.

At first glance this makes no sense. This creates an additional format conversion layer and NAD admits that the digital-direct inputs have a sonic advantage over going in analog.

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What confuses matters further is that class D amps are usually fed analog signals even though a few exceptions are driven by digital signals. All images accuphasee in this review are the property of fairaudio. In the latter case, PCM signal of digital sources like CD or network players connects directly to the amplifier input.


The – um, protection circuitry of NAD works reliably.

If it accepts digit figures, subsequent calculations can easily exceed those digits. Also the M2 was far from happy when sharing a duplex with an idling Fonel Emotion while playing itself. While the latter deserves praise, this unprotected feature with no secondary enable function to avoid such mishaps seems somewhat ill-considered. There are also coaxial and Toslink digital outputs. 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.

Coddling and all that. pp-5000

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 accuphaze challenge your residential circuit breaker system. While on power and AC, the M2 reacts audibly to correct power polarity.

A calculator with 35 digits will produce more accurate results. NAD then warns that “due to its special technologies and high-frequency shielding, the M2 must be plugged into a properly grounded socket, i.