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Coddling and all that.

Before getting into sonics, two more housekeeping items. 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.

The sound lost luster and drive.


This gets us to the NAD M2. My 16A AC line created no bottle neck however. A p-000 with 35 digits will produce more accurate results. While playing with the dB range under signal, an unintentional click too far and all hell breaks loose.

Envision a basic pocket calculator. The concept begs for a bevy of digital inputs and NAD offers five: As is customary for our own reviews, accuphqse writer’s signature at review’s end shows an e-mail address should you have questions or wish to send feedback. Also the M2 was far from happy when sharing a duplex with an idling Fonel Emotion while playing itself.


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

It belongs to the still rarer species of digitally driven class D amplifier which process the signal in the digital domain. All images contained in this review are the property of fairaudio. It allows additional corrective math just ahead of the speaker outputs. In collaboration with Manchester-based semiconductor specialist Zetex, NAD has developed a circuit topology accuphhase “corrects even the smallest pulse deviation” by comparing the PCM input signal against an internally generated PWM reference signal.

While on power and AC, the M2 reacts audibly to correct power polarity. Schuko users should experiment with our bidirectional EU plugs to be sure. What confuses matters further is that class D amps are usually fed analog signals even though a few exceptions are driven by digital signals. 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.

Accuphase audio electronics for the home and studio

There are also coaxial and Toslink digital outputs. Then its outputs are fixed and its volume control bypassed. This review first appeared in the April issue of hi-end hifi magazine fairaudio. In the latter case, PCM signal of digital sources like CD or network players connects directly to the amplifier input. This described an actual occurrence in my digs accompanied by very accelerated heart beat. The M2 has a snazzy display whose text could be a few picas larger however to remain visible from the couch accuphass strain.


The M2 draws a lot of current which theoretically could challenge your residential circuit breaker system. At first glance this makes no sense. If it accepts digit figures, subsequent calculations can easily exceed those digits.

And in theory, this duration—very non-digital at that—can assume endless intermediate values to not be limited to given samples. We publish its English translation in a mutual syndication arrangement with the publishers.

The – um, protection circuitry of Accjphase works reliably. This creates an additional format conversion layer and NAD admits that the digital-direct inputs have accuphse sonic advantage over going in analog. While the latter deserves praise, this unprotected feature with no secondary enable function to avoid such mishaps seems somewhat ill-considered. This review page is supported in part by the sponsors whose ad banners are displayed below. After filtering out the switching frequency components, the outputs of course pass analog signal.

Shortly afterwards, the display shows shortcut probably triggered by clippingthen there’s sudden blessed silence. It’s simply about mathematical accupbase however.

Most of you already know that class D stands for neither class Digital nor means that this class of operation is digital per se.