NAIM NDX User Manual

Copyright Naim Audio 2010 Page 1 of 8
Functionality
Naim’s NDX is an audio source product that integrates
network streaming, internet radio, iPod digital, replay from
USB memory stick and an optional DAB/FM tuner all in
one box. It also has three S/PDIF inputs (two transformer-
isolated coaxial inputs and one buffered optical input) for
the connection of other digital sources.
Naim NDX Network Audio Player
DESIGN, ENGINEERING AND TECHNOLOGY
By Gary Crocker and Hjalmar Nilsson September 2010
Naim Audio Ltd · Southampton Road · Salisbury · Wilts · SP1 2LN · England
exit
input
stop
play
ok
list
AC ONL Y
FREQUENCY: 50/60Hz
INPUT POWER: 60VA
FUSE RATING: ANTISURGE
100-120 V: T4AL.
220-240 V: T2AL/250V.
ON
OFF
Power
Power Supply Upgrade
Analogue Outputs
DIN LR
Chassis
Floating
RCA
CONFORMS
TO EN 60065
N17079
Z180
S/No.
WA RNING:
DISCONNECT SUPPLY CORD
BEFORE OPENING
ATTENTION:
DEBRANCHER AV A NT DíOUVRIR
WA RNING:
THIS APPARA T US MUST BE EARTHED
DESIGNED AND MADE IN ENGLAND BY
NAIM AUDIO LTD.
SOUTHAMPTON ROAD, SALISBURY
NDX
PLEASE READ THE MANUAL BEFORE USE
ch.1
ch.2
-ve
Wi-Fi
Aerial
Network
remote
in
RS232
Control
remote
out 1
remote
out 2
Digital Output
Signal
Ground
Digital Inputs
21
3
Contains Transmitter Module
FCC ID: D6XWL5011S
REFER TO OWNERS MANUAL
Fit NDX linkplug or PSU upgrade
Objective
To design an upgradeable network audio player that is sonically comparable to a high-end CD player.
As standard the NDX is controlled either via the front
panel display and buttons or by the supplied remote
control. With purchase of the Naim n-Stream application
full functional control is available via hand-held devices
such as the Apple iPad or iPod Touch.

NAIM NDX Specifications

General

Storage media type	Not available
Built-in storage media	No
Total storage capacity	- GB
Product color	Black
Internet radio	Yes
Supported radio bands	DAB, FM
Audio formats supported	AAC, AIFF, FLAC, MP3, OGG, WAV, WMA
Video formats supported	Not supported
Impedance	10 Ω
MP3 bit rates	0 - 320 Kbit/s
Frequency range	10 - 20000 Hz
Audio output channels	- channels
Total Harmonic Distortion (THD)	0.1 %
USB 2.0 ports quantity	1
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity	-
AC input voltage	115 - 230 V
AC input frequency	50 - 60 Hz

Weight and Dimensions

Depth	314 mm
Width	432 mm
Height	87 mm
Weight	10000 g

Summary

Network Streaming

Oversampling and Analogue Filtering

Digital Filtering

Filter and Clock Design

Low-Pass Filter Implementation

Discusses the choice and implementation of low-pass filters in the NDX.

Master Clock Design

Explains the importance of the master clock for audio output stability and noise.

Power and Clocking Systems

VCXO Clock Control

Explains how the NDX matches its clock to the source frequency using VCXO and DACs.

Low Noise Power Supply

Covers toroidal transformer, isolated windings, capacitors, and regulators for low noise.

Circuitry and Features

PCB Design and Analogue Circuits

Digital Output