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NAD

NAD VISO 1 AP AirPlay Music System

Chris Eberle

NAD introduced its own iPod dock, the VISO, last year at CEDIA. As one would expect from this high-end company, little expense was spared in its design as it sought to bridge the iPod, and other digital music players, with quality amplification and speakers while keeping it all in a compact package. With the proliferation of AirPlay streaming, it made sense that the second generation product should include this super-convenient feature. Hence, we have the VISO 1 AP, the subject of today's review. Where last year's VISO required you to chain your iPod to the unit, the AP lets you keep your iPod in your pocket so you can control your music from anywhere within reach of your WiFi network.

Media Servers

NAD M51 Direct Digital DAC

John E. Johnson, Jr.

 

Most audio component manufacturers have a DAC in their product lineup, and NAD is no exception. However, the NAD M51 is unusual in that it takes the incoming digital PCM bitstream and converts it directly to a PWM bitstream, which is then fed directly to the output. The idea has been around for about a decade, but the technology for implementing it was not fast enough in those early days. Now, with modern technology and techniques, NAD has produced what they call a "Direct Digital DAC", where the digital signal does not go through digital to analog conversion in the normal sense, but converted to PWM at 844 kHz sampling, with 35 bit word length. As you will see with the bench tests, the results are quite amazing, and the price is very affordable.

DACs

NAD M3 Integrated Stereo Amplifier

John E. Johnson, Jr.

If you look at the specs of most stereo integrated amplifiers, the rated RMS power output is between 60 watts and 120 watts per channel. This is lower than the power output of outboard power amplifiers, which typically are about 125 watts to 300 watts per channel. Monoblocks go all the way up to 2,000 watts output. One of the main reasons for this is that in an integrated power amplifier, the preamplifier circuit is situated very close to the power amplifier. Keeping the high voltage, high current power amplifier signal from inducting noise into the preamplifier circuit is difficult. NAD apparently has solved this problem with the introduction of their M3 Integrated Amplifier, which has a rated output of 180 watts per channel, at 0.004% THD+N, and clipping (1% THD+N) at 220 watts.

Integrated Amplifiers