MiniDSP NDAC-2 Manuel utilisateur

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 1

DSP-ENABLED POEAVB/IP ENDPOINTS

SPK-4P

COMPACT POWERED SPEAKER

NDAC-2

2-CHANNEL DAC

NPW-2

2-CHANNEL POWER AMPLIFIER

SPK-4

AUXILIARY PASSIVE SPEAKER

User Manual

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 2

Revision history

Revision

Description

Date

1.0

First released version

4th June 2019

1.1

Updated for configurations/presets, added panel diagram

17th June 2019

1.2

Added NDAC-2 and NPW-2 for combined manual, changed name

6 December 2019

1.3

Corrected crossover screenshot

31 January 2020

1.4

Updated support link

6 July 2020

1.5

Adobe AIR not needed any more

1 February 2021

 
 
miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 3 
TABLE OF CONTENTS 
Important Information........................................................................................................................................ 5 
1Product overview.......................................................................................................................................... 7 
1 Typical application................................................................................................................................ 7 
2 About AVB............................................................................................................................................ 8 
2Hardware connectivity.................................................................................................................................. 9 
3AVB Configuration –Mac OS X.................................................................................................................... 11 
1 Enabling AVB endpoint....................................................................................................................... 11 
2 Configuring multiple endpoints .......................................................................................................... 12 
4Software Installation .................................................................................................................................. 15 
1 Possible Mac installation issues.......................................................................................................... 16 
2 2x4 HD plugin installation................................................................................................................... 16 
5Configuring the AVB endpoint .................................................................................................................... 17 
1 Signal flow and processing overview................................................................................................... 17 
2 Synchronizing with the AVB endpoint................................................................................................. 18 
3 Key features ....................................................................................................................................... 19 
3.1 Master control............................................................................................................................ 19 
3.2 Configuration/preset selection ................................................................................................... 19 
3.3 Saving and loading configurations............................................................................................... 19 
3.4 Restoring to defaults................................................................................................................... 20 
3.5 Local configuration storage......................................................................................................... 20 
3.6 Input selection............................................................................................................................ 20 
4 Input channel strips............................................................................................................................ 21 
5 Routing .............................................................................................................................................. 22 
6 Output tab ......................................................................................................................................... 23 
6.1 Channel strip layout.................................................................................................................... 23 
6.2 Channel label.............................................................................................................................. 23 
6.3 Level meter and gain control ...................................................................................................... 23 
6.4 Parametric EQ............................................................................................................................. 24 
6.5 Crossover.................................................................................................................................... 26 
6.6 Compressor ................................................................................................................................ 28 
6.7 FIR.............................................................................................................................................. 29 
6.8 Invert and mute.......................................................................................................................... 29 
6.9 Time delay.................................................................................................................................. 29 
 

 
 
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7 Custom biquad programming ............................................................................................................. 30 
7.1 What’s a “biquad? ...................................................................................................................... 30 
7.2 Using custom biquad programming ............................................................................................ 30 
7.3 Biquad design software............................................................................................................... 32 
8 FIR filtering and design ....................................................................................................................... 33 
8.1 FIR filtering overview.................................................................................................................. 34 
8.2 FIR filter design software ............................................................................................................ 34 
8.3 Filter file format.......................................................................................................................... 34 
8.4 Loading filter coefficients............................................................................................................ 35 
9 Keyboard shortcuts ............................................................................................................................ 35 
6Additional information ............................................................................................................................... 36 
1 Specifications ..................................................................................................................................... 36 
1.1 All miniDSP AVB endpoints ......................................................................................................... 36 
1.2 SPK-4P ........................................................................................................................................ 36 
1.3 NPW-2........................................................................................................................................ 37 
1.4 NDAC-2....................................................................................................................................... 37 
2 Obtaining support .............................................................................................................................. 37 
 

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 5

IMPORTANT INFORMATION

Please read the following information before use. In case of any questions, please contact miniDSP via the

support portal at support.minidsp.com.

System Requirements –Windows

Use of the AVB endpoint is currently not supported on Windows.

System Requirements –Mac OS X

•Intel-based Mac with 1 GHz or higher processor clock speed

•512 megabytes (MB) of RAM or higher recommended

•OS X 10.9 or higher, macOS 10.12 or higher

•Ethernet network connection

Disclaimer/Warning

miniDSP cannot be held responsible for any damage that may result from the improper use or incorrect

configuration of this product. Please read this manual carefully to ensure that you fully understand how to

operate and use this product, as incorrect use or use beyond the parameters and ways recommended in this

manual have the potential to cause damage to your audio system.

Please also note that many of the questions we receive at the technical support department are already

answered in this User Manual and in the online application notes on the miniDSP.com website. So please take

the time to carefully read this user manual and the online technical documentation. Thank you for your

understanding!

Warranty Terms

miniDSP Ltd warrants this product to be free from defects in materials and workmanship for a period of one

year from the invoice date. Our warranty does not cover failure of the product due to incorrect connection or

installation, improper or undocumented use, unauthorized servicing, modification or alteration of the unit in any

way, or any usage outside of that recommended in this manual. If in doubt, contact miniDSP prior to use.

FCC Class B Statement

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

•This device may not cause harmful interference.

•This device must accept any interference received, including interference that may cause undesired

operation.

Warning: This equipment has been tested and found to comply with the limits for a Class B digital device,

pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection. This

equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance

with the instructions, may cause interference to radio communications. However, there is no guarantee that

interference will not occur in a particular installation. If this equipment does cause harmful interference to radio

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or television reception, which can be determined by turning the equipment off and on, the user is encouraged to

try to correct the interference by one or more of the following measures:

•Reorient or relocate the receiving antenna.

•Increase the separation between the equipment and receiver.

•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

•Consult the dealer or an experienced radio/TV technician for help.

Notice: Shielded interface cable must be used in order to comply with emission limits.

Notice: Changes or modification not expressly approved by the party responsible for compliance could void the

user’s authority to operate the equipment.

CE Mark Statement

The SPK-4P, NDAC-2 and NPW-2 have passed the test performed according to European Standard EN 55022

Class B.

A Note on this Manual

This User Manual is designed for reading in both print and on the computer. If printing the manual, please print

double-sided. The embedded page size is 8 ½” x 11”. Printing on A4 paper will result in a slightly reduced size.

For reading on the computer, we have included hyperlinked cross-references throughout the manual. In

addition, a table of contents is embedded in the PDF file. Displaying this table of contents will make navigation

much easier:

•In Adobe Reader on Windows, click on the “bookmarks” icon at the left. The table of contents will appear on

the left and can be unfolded at each level by clicking on the “+” icons.

•In Preview on the Mac, click on the View menu and select Table of Contents. The table of contents will

appear on the left and can be unfolded at each level by clicking on the triangle icons.

miniDSP Ltd, Hong Kong / www.minidsp.com / Features and specifications subject to change without prior notice 7

1PRODUCT OVERVIEW

Thank you for purchasing miniDSP DSP-enabled PoE IP audio products. This manual covers the stereo endpoints:

•SPK-4P powered speaker with DSP. The speaker includes two channels of amplification, so an additional

passive speaker, the SPK-4 can be connected on the rear panel.

•NPW-2 stereo power amplifier with DSP.

•NDAC-2 stereo analog line-level endpoint with DSP.

Each stereo endpoint includes a powerful DSP with an extensive range of audio processing functions, including

parametric EQ, FIR filters, high pass and low pass filters, delay and compression. All DSP functions are set up

from a PC or Mac with miniDSP’s user-friendly configuration software. A single CAT5/6 network cable provides

power, low latency audio and control.

1.1 TYPICAL APPLICATION

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1.2 ABOUT AVB

AVB defines a group of network protocols for the distribution of time-synchronized and low-latency audio &

video streams over IEEE802 networks. By leveraging a combination of existing 802 network technologies along

with standards specifically designed for the purpose, AVB technology lays the groundwork for unparalleled

guaranteed media streaming over Ethernet networks.

The overall concept of AVB is actually rather simple. In brief, the three core protocols specify:

1. Timing and synchronization

2. Bandwidth allocation through the Stream Reservation Protocol (SRP)

3. Traffic shaping to ensure that low priority Ethernet traffic does not interfere with AVB traffic.

Engineered from the ground up for media streaming applications, AVB has a definitive edge over legacy Ethernet

technology in the sense that it allows bandwidth allocation and priority rules based on timing. Unlike similar

audio over IP (AOIP) technology, AVB will dynamically assign and defend bandwidth allocation for AVB

streaming, thanks to the Stream Reservation Protocol (SRP).

These are the key terms used for AVB streaming:

Audio Video Bridging (AVB)

General descriptive for a group of protocols providing audio/ video streaming, timing,

synchronization, Quality of service (QoS), control and discovery.

AVB Endpoint

A device capable of transmitting and/ or receiving audio streams using the P1722/P1733

transport protocol.

Talker

An AVB endpoint transmitting audio to the network (source).

Listener

An AVB endpoint receiving audio from the network (sink/destination).

Talker/Listener

An AVB endpoint that is both transmitting and receiving.

Precision Time Protocol (PTP)

The protocol that allows devices on the network to get a notion of global time in order to

synchronize with each other. PTP components in each AVB module can act as a Grand Master

(providing clock) or as a slave (receiving clock). Once a grand master negotiates and is selected

as a sync source, all units will synchronize to it.

Stream ID

Unique 64-bit stream identifier used by AVB transport protocols to identify streams.

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2HARDWARE CONNECTIVITY

SPK-4P panel

NPW-2 panel

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NDAC-2 panel

Connections

12VDC

12 VDC power input from external power supply. This separate 12 VDC connection is not used if

the speaker is powered over Ethernet (PoE).

USB

USB Audio is not supported by the default endpoint firmware. Contact miniDSP directly if you

require a USB-capable firmware for the AVB endpoint.

TOSLINK

Digital optical input. Sample rates from 20 to 216 kHz are accepted.

AVB/ETH

Used for AVB audio and endpoint configuration. It must be connected to an AVB-capable switch.

If the switch provides PoE (Power over Ethernet), then the speaker is powered from this

connector and the 12VDC connector is not used.

AMP (SPK-4P)

The channel 2 output of the power amplifier is provided via this connector for connection to a

passive SPK-4.

AMP OUT (NPW-2)

Two channels of power amplifier output for connection to speakers.

ANALOG OUT (NDAC-2)

Balanced analog outputs.

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