NETWORK HUB A
N
NetworkAmp
Manager
NetworkAmp
Manager
E
Owner’s Manual
Owner’s Manual
2
NetworkAmp Manager—Owner’s Manual
Important Information
Special Notices
•The software and this owner’s manual are the exclusive copyrights of Yamaha Corporation.
•Use of the software and this manual is governed by the license agreement which the pur-
chaser fully agrees to upon breaking the seal of the software packaging. (Please read care-
fully the Software Licensing Agreement at the beginning of the printed ACU16-C/NHB32-C
Owner’s Manual before installing the application.)
•Copying of the software or reproduction of this manual in whole or in part by any means is
expressly forbidden without the written consent of the manufacturer.
•Yamaha makes no representations or warranties with regard to the use of the software and
documentation and cannot be held responsible for the results of the use of this manual and
the software.
•This disc is a CD-ROM. Do not attempt to play the disc on an audio CD player. Doing so
may result in irreparable damage to your audio CD player.
•Copying of the commercially available music sequence data and/or digital audio files is
strictly prohibited except for your personal use.
•The screen displays as illustrated in this owner’s manual are for instructional purposes, and
may appear somewhat different from the screens which appear on your computer.
•Future upgrades of application and system software and any changes in specifications and
functions will be announced separately.
Trademarks
CobraCAD, CobraNet, and Peak Audio are trademarks of Cirrus Logic, Inc. Ethernet is a
trademark of Xerox Corporation. Windows is a registered trademark of Microsoft Corpo-
ration. Yamaha is a trademark of Yamaha Corporation. All other trademarks are the prop-
erty of their respective holders and are hereby acknowledged.
Yamaha Web Site
Information about NetworkAmp Manager, related products, and other Yamaha profes-
sional audio equipment is available on the Yamaha Professional Audio Web site at:
http://www.yamahaproaudio.com/.
Specifications and descriptions in this owner’s manual are for information purposes only.
Yamaha Corporation reserves the right to change or modify products or specifications at
any time without prior notice. Since specifications, equipment, or options may not be the
same in every locale, please check with your Yamaha dealer.
3
NetworkAmp Manager—Owner’s Manual
Contents
1 Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
What is CobraNet? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Using Multiple PCs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installing NetworkAmp Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Starting NetworkAmp Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Quitting NetworkAmp Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Configuring NetworkAmp Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Working with Projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Touring NetworkAmp Manager . . . . . . . . . . . . . . . 10
Main Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Network Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4 NHB Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
CobraNet Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Patch Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Word Clock Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5 ACU Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
CobraNet Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Patch Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Amp Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Channel Detail Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Threshold Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6 Other Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Logging Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Locking NetworkAmp Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Using COM & MIDI Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Group View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Control Link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Keyboard Shortcuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Introduction 4
NetworkAmp Manager—Owner’s Manual
1 Welcome
Introduction
The Yamaha NetworkAmp Manager software is for controlling and monitoring Yamaha
PCxxxxN series power amplifiers, the ACU16-C Amp Control Unit, and the NHB32-C
Network Hub and Bridge. It runs on standard Windows PCs and can be connected to an
ACU16-C or NHB32-C by using either USB or RS-232C. Multiple ACU16-Cs and
NHB32-Cs can be managed from a single PC running NetworkAmp Manager, which can
be connected to any ACU16-C or NHB32-C on the CobraNet network.
NetworkAmp Manager can record log files listing various operations and warnings (e.g.,
output shorts, overheating) for troubleshooting analysis after a performance.
Several PCs running NetworkAmp Manager can be connected to the CobraNet network,
offering simultaneous control and monitoring from several locations within a venue.
NetworkAmp Manager can control and manage the following:
Up to 512 Yamaha PCxxxxN series power amplifiers (32 amps per ACU16-C)
Up to 4,096 amplifier channels (8 channels per amplifier)
Up to 16 ACU16-Cs
Up to 8 NHB32-Cs
PCxxxxN Series Amp Parameters That Can Be Controlled
PCxxxxN Series Amp Parameters That Can Be Monitored
Parameter Details
Power
1
1. Affects the entire amplifier. All other parameters can be set for each channel individually.
On/standby
Attenuator 63-step control
Input phase Normal/reverse
Mute On/off
Parameter Details
Amp mode Stereo/parallel/bridge
Input level 12-segment meter
Output level 12-segment meter (watt/volt)
Output clip Output clipping indicator
Impedance Indicates current load impedance
Protection Protection system status
Temperature Heatsink temperature, 12-segment meter (centigrade/Fahrenheit)
5 Welcome
NetworkAmp Manager—Owner’s Manual
What is CobraNet?
CobraNet is technology developed by Peak Audio (Cirrus Logic, USA) that transmits
uncompressed digital audio signals in realtime over a fast Ethernet cable. It can carry up to
64 channels in each direction or 128 channels total for both directions (64 channels total for
both directions in a network that uses a repeater hub). (However, the number of channels
is limited by conditions such as the performance of your equipment and on the type of
audio signal.)
Tr ansmission of up to 100 meters is possible with Category 5 metal cable, or up to 2 km with
multi-mode optical fiber cable.
A CobraNet network can carry digital audio at sampling frequencies of 48 kHz or 96 kHz
and 16/20/24 bit resolutions, but the ACU16-C/NHB32-C support the 48 kHz sampling
frequency at 20/24 bit resolutions. A fixed latency is added to the audio data each time it
passes through a CobraNet network. You can select this latency from 5.33 ms / 2.67 ms /
1.33 ms.
A CobraNet network can carry audio over an existing Fast Ethernet network to which other
devices such as computers and printers are already connected, but we strongly recommend
that you set up a dedicated network for CobraNet.
In a CobraNet network, digital audio is distributed in packets called “bundles.” Each bundle
contains between three and eight channels of audio, depending on conditions such as the
bit depth and latency.
Bundles are assigned a number in the range of 0 through 65,279. Bundles can be transmit-
ted either as “multicast bundles” which occupy more network bandwidth but allow audio
to be distributed to multiple devices simultaneously, or as “unicast bundles” which use less
network bandwidth but can distribute audio to only a single device. The number assigned
to the bundle determines which of these two types it is. Number 0 indicates a null setting
that disables transmission or reception of bundles, numbers 1 through 255 indicate multi-
cast bundles, and numbers 256 through 65,279 indicate unicast bundles. The
ACU16-C/NHB32-C support bundle numbers 0 through 16,383.
The ACU16-C can accept up to four input bundles simultaneously, and the NHB32-C can
use four input bundles and four output bundles simultaneously. However if you set the
latency to 1.33 ms, the number of bundles usable on the NHB32-C will be a maximum of
four (total for input and output).
A CobraNet network also provides a Serial Bridge feature that allows serial data to be trans-
mitted over the network. The ACU16-C and NHB32-C normally use the Serial Bridge to
transmit amp control data, but you can also use COM mode or MIDI mode to send other
data between two NHB32-C units via the Serial Bridge.
A glossary of CobraNet, NetworkAmp Manager, ACU16-C, and NHB32-C related terms is
provided in this manual (see page 39). A wealth of information about CobraNet, with sec-
tions especially for designers and installers, is available on the Peak Audio Web site at
http://www.peakaudio.com. If you are designing a CobraNet network, we strongly recom-
mend that you visit this Web site and study the information available in order to take full
advantage of the CobraNet technology. Peak Audio also provide a list of Ethernet devices
that have been tested with CobraNet, including switching hubs and media converters.
Using Multiple PCs 6
NetworkAmp Manager—Owner’s Manual
Using Multiple PCs
Several PCs running NetworkAmp Manager can be connected to the CobraNet network,
offering simultaneous control and monitoring from several locations within a venue.
Up to 16 channels of real-time data (e.g., level meter information) can be transmitted across
the network simultaneously. When operating NetworkAmp Manager on several PCs simul-
taneously, operation of the meter displays on the following pages may be interrupted:
•Amp pages
•Channel Detail page
•Group View page
When one of the above pages is selected, any other PCs displaying one of these pages will
automatically switch to its Network page and display the same information. For example, if
PC #1 is displaying the Amp 00–07 page, and PC #2 is displaying the Amp 24–31 page, if the
Amp 08–15 page is selected on PC #1, PC #2 will switch to its Network page and display the
same information. PCs that are not displaying one of the above pages do nothing.
7 Getting Started
NetworkAmp Manager—Owner’s Manual
2 Getting Started
Installing NetworkAmp Manager
System requirements and installation instructions for NetworkAmp Manager can be found
in the printed ACU16-C/NHB32-C Owner’s Manual.
Starting NetworkAmp Manager
To start NetworkAmp Manager, double-click the NetworkAmp Manager icon. If a startup
project has been specified on the General Setup dialog box (see page 8), that project is
opened. Otherwise, the Open dialog box appears and you can select the project you want to
open. NetworkAmp Manager can also be started by double-clicking a project file. In either
case, the following dialog box appears.
Disconnect from network: Start NetworkAmp Manager but do not connect to the
network.
Connect to network: Start NetworkAmp Manager and connect to the network, getting
the settings of all devices on the network and updating the project settings accordingly.
Connect & send to network: Start NetworkAmp Manager, connect to the network,
and send the project settings to all devices on the network, updating them accordingly.
Quitting NetworkAmp Manager
To quit NetworkAmp Manager, choose Exit from the File menu, or click the main window’s
Close button. A confirmation message appears. Click Yes to quit. Click No to cancel.
If there are no unsaved changes, NetworkAmp Manager quits. If there are unsaved changes,
a dialog box asking if you want to save the changes before quitting appears. Click Yes to save
the changes and quit. Click No to quit without saving the changes.
Caution: Don’t transmit any audio data until all networked devices (ACU16-C, NHB32-C,
and power amplifiers) have been turned on, the power amplifier’s REMOTE indicators are
on, and the system has stabilized (about 10 seconds). Doing so may produce loud noises.
Note: If you change any settings on the Windows Display control panel, NetworkAmp Man-
ager’s windows may not display properly. In this case, you should reset the Display control
panel settings to their defaults.
Configuring NetworkAmp Manager 8
NetworkAmp Manager—Owner’s Manual
Configuring NetworkAmp Manager
The General Setup dialog box is used to configure NetworkAmp Manager. To open the
General Setup dialog box, choose General Setup from the Option menu.
PC I/F for amp control: These options are used to specify the MIDI interface Net-
workAmp Manager should use to communicate with the connected ACU16-C/NHB32-C.
The options available depends on what MIDI drivers you have installed on your PC. Choose
the Yamaha CBX Driver (for use with serial ports) or Yamaha USB Driver (for use with USB
ports). See the ACU16-C/NHB32-C Owner’s Manual for information on installing these
drivers.
Control error caution: When this option is selected, a message is displayed in the Log
window when a parameter is adjusted on another PC or an ACU16-C or NHB32-C.
Default project: These options determine how NetworkAmp Manager behaves when it’s
started. When “None” is selected, the project open dialog box appears automatically and
you can select a project file manually. When the “Specified project” option is selected, the
specified project is opened automatically. Click the Browse button to select the project file
to be opened automatically. If you enter the filename manually, be sure to include the full
path (e.g., C:\My Documents\NetworkAmp Manager\My Project.apj).
Temperature display units: These options determine the units NetworkAmp Manager
uses to display temperature values: Centigrade (˚C) or Fahrenheit (˚F).
Output meter units: These options determine the units NetworkAmp Manager uses to
display power amplifier output values: Watt (W) or Volt (V).
The “PC I/F for amp control” and “Default project” settings are stored in the Windows Reg-
istry. All other settings are stored in the project file.
9 Getting Started
NetworkAmp Manager—Owner’s Manual
Working with Projects
NetworkAmp Manager setups are stored as projects.
Project files have the file name extension “.apj”.
•To create a new project, choose New from the File menu.
•To open a previously saved project, choose Open from the File menu.
•To save the current project, choose Save from the File menu.
•To save the current project with a new name, choose Save As as from the File menu.
Only one project can be open at a time. If you create a new project or open a previously
saved project, you’ll be prompted to save any unsaved changes.
Main Window 10
NetworkAmp Manager—Owner’s Manual
3 Touring NetworkAmp Manager
Main Window
This is NetworkAmp Manager’s main window. The left pane displays the CobraNet net-
work tree, consisting of ACU16-Cs, NHB32-Cs, and power amps. The right pane displays
the various NHB and ACU pages. The name and unit ID of the device currently selected in
the network tree are displayed at the top of the right pane. If it’s an ACU16-C, “ACU - name
[Unit ID]” is displayed. If it’s an NHB32-C, “NHB - name [Unit ID]” is displayed. You can
set the device names in NetworkAmp Manager (see page 13). Unit IDs are set on the actual
devices.
11 Touring NetworkAmp Manager
NetworkAmp Manager—Owner’s Manual
Menus
File
Edit
These commands are available only when an editable text field is selected, including the
threshold values on the ACU Threshold page (see page 24). These commands also appear
on the pop-up Edit menu that appears when you right-click an editable item. The pop-up
menu also has Undo and Select All commands.
View
Option
Window
Help
New
Creates a new project
Open
Opens an existing project
Save
Saves the current project
Save As
Saves the current project with a new name
Disconnect from Network
1
Disconnects NetworkAmp Manager from the network
Connect to Network
1
1. A check mark appears next to either of these commands, indicating the current status. If the con-
nected ACU16-C/NHB32-C is turned off, the check mark appears next to the “DIsconnect from Net-
work” command and a disconnection warning message appears.
Connects NetworkAmp Manager to the network
Connect & send to network
Connects NetworkAmp Manager to the network and sends the
project settings to all devices on the network
Exit
Quits NetworkAmp Manager
Cut
Moves the currently selected item to the clipboard
Copy
Copies the currently selected item to the clipboard
Paste
Pastes the item on the clipboard to the current location
Delete
Deletes the currently selected item
Group View
Displays the Group View page
Control Link
Displays the Control Link page
Log Setup
Opens the Log Setup dialog box
Operation Lock
Opens the Operation Lock dialog box
COM/MIDI Mode
Opens the COM/MIDI Mode dialog box
General Setup
Opens the General Setup dialog box
Factory Reset
Resets the ACU16-C or NHB32-C connected to your PC
Log Window
Opens the Log window
Help
1
1. If this command is unavailable, select a language from the Help Topics submenu.
Opens this manual (PDF format)
Help Topics
Selects the language, English, Japanese, German, French, or Spanish,
of the NetworkAmp Manager Owner’s Manual
About
Opens the About NetworkAmp Manager window
Network Tree 12
NetworkAmp Manager—Owner’s Manual
Network Tree
The network tree displays all the ACU16-Cs, NHB32-Cs, and
power amps in the project in a tree-like structure. Items are dis-
played in order of unit ID. The tree can be expanded and col-
lapsed by clicking the plus and minus symbols.
The following table lists the items that can appear in the network tree.
Networked devices can be offline, online, or in COM/MIDI mode, and the current status is
indicated by icon color, as shown in the table above. While NetworkAmp Manager is receiv-
ing data from a device, the corresponding icon flashes.
When the PRJ icon is gray (offline), no networked devices are being controlled and moni-
tored (i.e., NetworkAmp Manager is disconnected from the network). When it’s green
(online), networked devices are being controlled and monitored (i.e., NetworkAmp Man-
ager is connected to the network). When it’s yellow, COM/MIDI mode is being used.
When an ACU, NHB, AMP, or CH icon is gray (offline), that device is either not turned on
or not connected. When an icon is green (online), the device is turned on and connected
and can be controlled and monitored. When an icon is yellow, COM/MIDI mode is being
used.
Item
Icon
Label
Parent
node
Maximum
number
Offline Online
COM/MIDI
mode
PRJ
Project name
—1
ACU
Unit ID + ACU16-C name
PRJ 16
NHB
Unit ID + NHB32-C name
PRJ 8
AMP
Unit ID + amp name
ACU
32 (per
ACU16-C)
CH
Channel name
Amp
8 (per
amp)
13 Touring NetworkAmp Manager
NetworkAmp Manager—Owner’s Manual
PRJ
The PRJ icon always appears at the top of the network tree.
The following menu appears when you right-click the PRJ icon.
Add: Adds an ACU16-C or NHB32-C to the project. When you choose either of these
commands, a dialog box appears for you to specify the device name and unit ID.
Rename: Opens the Rename dialog box so you can rename the project.
ACU
When you click an ACU icon, the ACU pages appear in the main window’s right pane.
The following menu appears when you right-click an ACU icon.
Add: Adds a PCxxxxN series power amplifier to the ACU16-C. When you add an ampli-
fier, a dialog box appears for you to specify the device name, unit ID, and channel mode
(i.e., Parallel, Bridge, or Stereo).
As of this writing, the Yamaha PC9501N/PC6501N/PC4801N/PC3301N/PC2001N/
PC9500N/PC4800N/PC3300N power amplifiers can be added to projects. Please check the
Yamaha Professional Audio Web site at the following URL for news and information on net-
workable power amplifiers to be released in the future, and for information on other
Yamaha professional audio products: http://www.yamahaproaudio.com/.
Amplifiers are defined in the device definition file. As and when Yamaha introduce new net-
workable power amps, an updated device definition file will be made available.
Delete: Deletes the ACU16-C from the project. A confirmation message appears before
the ACU16-C is deleted.
Rename: Opens the Rename dialog box so you can rename the ACU.
Note:
•You can check the version of a device definition file by selecting [About] from the [Help]
menu.
•If you intend to drive the PC3301N power amplifier at a high impedance in Bridge mode,
note the following:
–If the load impedance is 50 Ω or higher (total speaker input is 200W or lower), the imped-
ance indicator will not display the correct value.
–If the load impedance is 500 Ω or higher (total speaker input is 21W or lower), and the
output meter displays the level in watts, the meter will not respond. (If the meter displays
the level in volts, it will display the correct level.)
Network Tree 14
NetworkAmp Manager—Owner’s Manual
NHB
When you click an NHB icon, the NHB pages appear in the main window’s right pane.
The following menu appears when you right-click an NHB icon.
Delete: Deletes the NHB32-C from the project. A confirmation message appears before
the NHB32-C is deleted.
Rename: Opens the Rename dialog box so you can rename the NHB.
AMP
When you click an AMP icon, the ACU Amp pages appear in the main window’s right pane.
The following menu appears when you right-click an AMP icon.
Delete: Deletes the amplifier from the project. A confirmation message appears before the
amplifier is deleted.
Rename: Opens the Rename dialog box so you can rename the amplifier.
CH
When you click a CH icon, the ACU Channel Detail page appears in the main window’s
right pane.
The following menu appears when you right-click a CH icon.
Rename: Opens the Rename dialog box so you can rename the amplifier channel.
15 NHB Pages
NetworkAmp Manager—Owner’s Manual
4 NHB Pages
This chapter explains the NHB pages, which can be selected while an NHB32-C is selected
in the network tree.
Devices on a CobraNet network transmit and receive audio data by matching bundle num-
bers. Matching the bundle number on the transmitting and receiving devices is analogous
to making a physical cable connection between two devices. For example, if the Transmit
bundle assignment (CobraNet Output) on NHB32-C #1 is set to bundle #5, and the Receive
bundle assignment (CobraNet Input) on NHB32-C #2 is also set to bundle #5, audio data
in bundle #5 will be carried from NHB32-C #1 to NHB32-C #2.
CobraNet Page
In this page you can make CobraNet bundle assignments, and specify the audio resolution
and CobraNet network latency for the transmitted bundles.
CobraNet distributes digital audio data in bundles. A single bundle can carry eight channels
of 20-bit/48 kHz digital audio, or seven channels of 24-bit/48 kHz digital audio (with a
latency of 5.33 ms). The NHB32-C supports bundles 0 through 16,383 (multicast and uni-
cast). Bundle 0 is not really a bundle as such, more of a null setting used to disable trans-
mission or reception.
Enable Unicast: If you do not check this check box, you can specify bundle 0 and multi-
cast bundles 1 through 225. If you check this check box, you can specify unicast bundles 256
through 16,383, in addition to bundle 0 and multicast bundles 1 through 225.
Receive bundle assignment: These parameters are used to specify the bundles that
contain the CobraNet channels you want to patch to the NHB32-C’s AES/EBU outputs. You
can patch the individual channels in each bundle on the NHB Patch page (see page 17).
Latency: This parameter is used to specify the latency of audio data distributed from the
NHB32-C to the CobraNet network in msec units. In most cases, select 5.33 ms. You can
also select 2.67 ms or 1.33 ms (low latency). However if you decrease the latency, this will
CobraNet Page 16
NetworkAmp Manager—Owner’s Manual
intensify the restrictions on Ethernet’s packet delivery times, and therefore reduce the max-
imum number of switches that can be used. For details, refer to the Peak Audio website
(http://www.peakaudio.com).
The number of channels assignable per single device:
Transmit bundle assignment: These parameters are used to specify the bundles that
contain the CobraNet channels you want to patch to the NHB32-C’s AES/EBU inputs. You
can patch the individual channels in each bundle on the NHB Patch page (see page 17).
Audio resolution: This option is used to specify the audio resolution for bundle trans-
mission: 20 or 24 bit. Be sure to select 24-bit if you are using 24-bit digital audio. Otherwise,
your audio will be truncated to 20-bit.
Note: If the latency is 1.33 ms, the number of bundles that can be handled by this single device
on a CobraNet network will be limited to a total of four bundles for transmission and reception.
When changing the latency to 1.33 ms from some other setting, you will be unable to make
this change if the total number of bundles for transmission and reception is five or more.
Latency
20-bit 24-bit
Channels
per bundle
Maximum number of bundles
(total of input and output)
Channels
per bundle
Maximum number of bundles
(total of input and output)
5.33ms 8878
2.67ms 8888
1.33ms 8484
Note: You can change the latency setting only while offline. In order to apply the setting to the
NHB32-C or ACU16-C, you must execute “Connect & send to network.” It is possible that
noise will occur somewhere in the system when you change the latency. To prevent damage to
speakers or other components, you should turn down the audio to the CobraNet network or
turn down the output of the power amps before making this change.
Note: If two or more latencies exist within a CobraNet network, there is a danger that the
devices may become unable to communicate correctly with each other. You must make the
same latency setting for all devices in a single network.
Note: If you are unable to change the latency, refer to Troubleshooting (see page 38).
Note: Two or more devices cannot transmit data in the same bundle. So do not assign the same
bundle to more than one group.
17 NHB Pages
NetworkAmp Manager—Owner’s Manual
Patch Page
This page is used to assign AES/EBU inputs and outputs to individual CobraNet channels
and to store and recall assignment patches. Before making any assignments, you must spec-
ify the bundles that contain the CobraNet channels you want to patch (see page 15).
AES/EBU inputs and outputs are assigned to CobraNet channels on two 32 x 32 grids, one
for inputs, one for outputs. To make an assignment, click on the grid at the relevant inter-
section. A blue spot appears when an assignment has been made. To cancel an assignment,
click the blue spot.
Only one AES/EBU input or output can be assigned to each CobraNet channel. For example
if you select a latency of 5.22 ms and a bit depth of 24 bits in the NHB CobraNet page (see
page 15), the number of channels in each group will decrease to 7, and channels 8, 16, 24,
and 32 will be unavailable.
Network efficiency can be optimized by using all channels in each bundle instead of, for
example, using four channels in two bundles or two channels in four bundles.
EDIT indicator
Word Clock Page 18
NetworkAmp Manager—Owner’s Manual
AES/EBU In to CobraNet: This tab is used to assign AES/EBU inputs to CobraNet
channels.
CobraNet to AES/EBU Out: This tab is used to assign CobraNet channels to AES/EBU
outputs.
Store/Recall: These buttons are used to store and recall patches. A patch consists of all
AES/EBU input and output to CobraNet channel assignments. There are 100 patch mem-
ories. Patch #0 is a read-only memory containing initial assignments, with each AES/EBU
input and output assigned to the correspondingly numbered CobraNet input and output.
For example, AES/EBU input #1 is assigned to CobraNet output #1, AES/EBU input #2 is
assigned to CobraNet output #2, and so on. Up to 99 patches can be stored in patch mem-
ories 1 through 99.
To store a patch, use the Up and Down arrow buttons to select a patch memory from 1 to
99, enter a title, and then click the Store button. The patch is immediately transferred to,
and stored in the NHB32-C, where it is can be recalled directly from the front panel.
To recall a patch, use the Up and Down arrow buttons to select a patch memory from 0 to
99, and then click the Recall button.
When a patch is edited, the “EDIT” indicator appears next to the patch number. It disap-
pears when the patch is stored or another patch is recalled.
Word Clock Page
This page is used to select the NHB32-C’s wordclock source.
Master clock: This indicator shows the wordclock lock status of the NHB32-C: LOCK or
UNLOCK. It works in unison with the LOCK indicator on the NHB32-C’s front panel.
Word clock source select: These options are used to select the NHB32-C’s wordclock
source, which can be a pair of AES/EBU inputs, the CobraNet network, or the NHB32-C’s
BNC WORD CLOCK IN connector. A confirmation message appears when you change the
wordclock source. The wordclock source can also be selected on the NHB32-C’s front panel.
Note: When you change the wordclock settings of your system, some devices may output noise,
so turn down your power amps beforehand, otherwise you may damage your speakers.
19 ACU Pages
NetworkAmp Manager—Owner’s Manual
5 ACU Pages
This chapter explains the ACU pages, which can be selected while an ACU16-C is selected
in the network tree.
Devices on a CobraNet network transmit and receive audio data by matching bundle num-
bers. Matching the bundle number on the transmitting and receiving devices is analogous
to making a physical cable connection between two devices. For example, if the Transmit
bundle assignment (CobraNet Output) on an NHB32-C is set to bundle #4, and the Receive
bundle assignment (CobraNet Input) on an ACU16-C is also set to bundle #4, audio data
in bundle #4 will be carried from the NHB32-C to the ACU16-C.
CobraNet Page
In this page you can make CobraNet bundle assignments and specify the latency of the
CobraNet network.
You can specify which bundles you want the ACU16-C to receive. The ACU16-C supports
bundles 0 through 16,383 (multicast and unicast). Bundle 0 is not really a bundle as such,
more of a null setting used to disable transmission or reception.
Enable Unicast: If you do not check this check box, you can specify bundle 0 and multi-
cast bundles 1 through 225. If you check this check box, you can specify unicast bundles 256
through 16,383, in addition to bundle 0 and multicast bundles 1 through 225.
Receive bundle assignment: These parameters are used to specify the bundles that
contain the CobraNet channels you want to patch to the ACU16-C’s analog outputs. You
can patch the individual channels in each bundle on the ACU Patch page (see page 20).
Latency: This parameter is used to specify the latency of audio data received from the
CobraNet network in ms units. Normally, select 5.33 ms. You can also select 2.67 ms or
1.33 ms (low latency).
The number of bundles that can be assigned per unit is always four bundles, regardless of
the latency setting.
Note: You can change the latency setting only while offline. In order to apply the setting to the
NHB32-C or ACU16-C, you must execute “Connect & send to network.” It is possible that
noise will occur somewhere in the system when you change the latency. To prevent damage to
speakers or other components, you should turn down the audio to the CobraNet network or
turn down the output of the power amps before making this change.
Patch Page 20
NetworkAmp Manager—Owner’s Manual
Patch Page
This page is used to assign individual CobraNet channels to ACU16-C analog outputs.
Before making any assignments, you must specify the bundles that contain the CobraNet
channels you want to patch (see page 19).
CobraNet channels are assigned to ACU16-C analog outputs on a 16 x 32 grid. To make an
assignment, click on the grid at the relevant intersection. A blue spot appears when an
assignment has been made. To cancel an assignment, click the blue spot.
Only one CobraNet channel can be assigned to each ACU16-C output. The bundle number
assigned to each group of CobraNet channels is displayed along the left side of the grid.
Note: If two or more latencies exist within a CobraNet network, there is a danger that the
devices may become unable to communicate correctly with each other. You must make the
same latency setting for all devices in a single network.
Note: If you are unable to change the latency, refer to Troubleshooting (see page 38).
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