Nad C 390 DD Service Manual

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DAC/Amplifier

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C 390DD Direct Digital Powered

Our C390DD DAG/Amplifier is a new concept in amplification and in high definition audio system architecture. Featuring Direct Digital
technology first introduced in our now famous M2 Direct Digital Amplifier, the C 390DD will amaze with its transparent, dynamic
and detailed sound quality. The most accurate DAC/amplifier ever devised, the C 390DD is packed with loads of power, MDC
upgradability, software defined operation (offering simple software updates), and exclusive NAD features. Rethink how a music

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Features

> Revolutionary Direct Digital Technology

The C 390DDs proprietary Direct Digital technology has no
analogue stages in the signal path, keeping music in the digital
domain right up to the speaker outputs. Preamp functions occur in
the digital domain without the phase shift, noise, and distortion that
plagues all analogue designs. A 35-bit architecture and a 108MHz
master clock also make Direct Digital one of the most accurate
DAC technologies available. Direct Digital also includes a large
amount of DSP processing power, which we have fully exploited
to give you extra useful features.

> Immense Power

The C 390DD has a very high continuous power rating of 150W
per channel with almost immeasurable distortion and noise. Our
exclusive Digital PowerDrive circuit senses the speaker load and
alters amplifier characteristics to enhance power delivery into
your loudspeakers with great efficiency. Digital PowerDrive can
more than triple the C 390DD's rated power while effortlessly
reproducing musical transients with accuracy.

> New System Architecture

The C 390DD performs the functions of multiple conventional
components, so you can change the way your music system is
configured. The C 390DD is ready for the world of computer audio
with its asynchronous USB input that can directly play 24/96
content from your computer. Connections in front and rear
support USB portable flash memory devices and external hard
drives (FAT32).

> Modular Design Construction (MDC)

A pure digital system has many advantages, but one drawback
is the constantly changing delivery formats for digital
content. For this reason, we developed MDC, which places
all digital interface circuitry on replaceable modules. The
C 390DD comes standard with one DD USB-l Module for USB
interface, with room for two more modules. Current options are
the DD HDMI-1 Module (three HDMI inputs, one output), and
the DD AP-1 Module with phono preamp for analogue source
compatibility with the C 390DDs pure digital circuitry.

> Exclusive Room EQ

Room E0 is our simple solution to problematic room modes or
standing waves that result in undesirable boomy bass. Playing
back a supplied test tone sequence easily tames this problem by
using your ears and the C 390DD Room EQ filters. Six frequency
centres in the low bass region can be cut (or slightly boosted)
to remove the boom without reducing the low bass response.

> Advanced Integration

The C 390DD comes standard with eight inputs, which can
be expanded to 14 with the optional MDC modules. Inputs can
be activated or hidden, and can be renamed for the source
component attached. Listening Mode, Polarity, and NAD Soft
Clipping are all easily selected and adjusted. RS-232,
IR Inputs/Outputs and 12V triggers all make integration with
home automations systems simple and effective.

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