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NAD then warns that “due to its special technologies and accuphxse shielding, the M2 must be plugged into a properly grounded socket, i. It belongs to the still rarer species of digitally driven class D amplifier which process the signal in the digital domain. Also the M2 was far from happy when sharing a duplex with an idling Fonel Emotion while playing itself. This review first appeared in the April issue of hi-end hifi magazine fairaudio.

While digital signal is processed up to 24 bits and analog automatically converted to 24 bits, NAD actually talks of bit math. 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.

Accuphase P Stereo Power Amplifier Japan Audio | eBay

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


We publish its English translation in a mutual syndication arrangement with the publishers.

It allows additional corrective math just ahead of the speaker outputs. The sound lost luster and drive.

Accuphase P & Luxman CA | Audiokarma Home Audio Stereo Discussion Forums

Shortly afterwards, the display shows shortcut probably triggered by clippingthen l-5000 sudden blessed silence. While playing with the dB range under signal, an unintentional click too far and all hell breaks loose.

Most of you already know that class D stands for neither class Digital nor means that this class of operation is digital per se. This creates an additional format conversion layer and NAD admits that the digital-direct inputs have a sonic advantage over going in analog. This review acculhase is supported in part by the sponsors whose ad banners are displayed below.

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. There are also coaxial and Toslink digital outputs.

A calculator with 35 digits will produce more accurate results. This gets us to the NAD M2. The M2 has a snazzy display whose text could be a few picas larger however to remain visible from the couch without strain. Coddling and all that.

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After filtering out the switching frequency components, the outputs of course pass analog signal. At first glance this makes no sense. The M2 draws a lot of current which theoretically could challenge your residential circuit breaker system. Envision a basic pocket calculator. What confuses matters further is that class D amps are usually fed analog signals even though a few exceptions are driven by digital signals.


This described an actual occurrence in my digs accompanied by very accelerated heart beat. Before getting into sonics, two more housekeeping items. While the latter deserves praise, this unprotected feature with no secondary enable function to avoid such mishaps seems somewhat ill-considered. Schuko users should experiment with our bidirectional EU plugs to be sure. If it accepts digit figures, subsequent calculations can easily exceed those digits.

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.

The – um, protection circuitry of NAD works reliably. It’s simply about mathematical headroom however. The concept begs for a bevy of digital inputs and NAD offers five: My 16A AC line created no bottle neck however. And in theory, this duration—very non-digital at that—can assume endless intermediate values to not be limited to given samples. All images contained in this review are the property of fairaudio. Then its outputs are fixed and its volume control bypassed. 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.