Clear One AP800 User manual

AP800 Audio Conferencing System
Installation & Operation Manual

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Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
© 2002 ClearOne Communications, Inc. All
rights reserved. No part of this document may
be reproduced in any form or by any means
without written permission from ClearOne
Communications, Inc. Printed in the United
States of America. ClearOne Communications,
Inc. reserves specific privileges. Information in
this document is subject to change without
notice.
AP800 Installation and
Operation Manual
ClearOne Part No. 800-150-001
July 2002 (Rev. 3.0)

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Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
AP800 Installation and Operation Manual
Table of Contents
CHAPTER 1: Introduction 1
Product Overview 1
Features 2
Professional Services Group 3
Technical Support 3
Sales and Customer Service 3
ClearOne Communications EuMEA GmbH 3
Product registration 3
Product returns 3
Unpacking 4
Controls and Connections 4
Front panel 4
Rear panel 5
G-Link Network 6
CHAPTER 2: Installation 7
Equipment Requirements 7
Power requirements 7
Auxiliary equipment 7
Equipment placement 7
Environmental requirements 7
Hardware Setup 8
Connecting the unit 8
Networking Units 9
G-Link connections 9
Device IDs 10
Mixer Mode 11
LCD Programming 13
Menu Trees 13
System parameters 15
Input Parameters 21
Output Parameters 24

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Routing Parameters 24
Meter Parameters 27
CHAPTER 3: AP-Ware Software 29
Description 29
Installing AP-Ware 30
To install AP-Ware 30
CHAPTER 4: Operation 31
Control 31
Remote Control 31
Volume Control 31
Muting 32
APPENDICES 33
Appendix A: Specifications 33
Appendix B: Warranty 34
Appendix C: Compliance 35
Appendix D: Connector Pinouts 36
Appendix E: Accessories 38
Appendix F: Serial Commands 39
Appendix G: Worksheets 58
Glossary 61
Index 64

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
Congratulations on purchasing the Audio Perfect
®
800, an advanced twelve-by-
twelve digital matrix mixer with Gentner
®
Distributed Echo Cancellation
®
and audio
processing. It uses six user-definable presets to quickly adapt to a variety of
teleconferencing and sound reinforcement applications such as distance learning,
teletraining, telemedicine, courtrooms, conference rooms, boardrooms, hotels, and
houses of worship.
All of the AP800’s functions are programmed in AP-Ware™, an all-new
configuration software. The result is quicker setup, with fewer hassles and more
control.
In its most simple form, the AP800 is a mic mixing matrix. As such, all mic
mixing parameters can be customized and any input or combination of inputs can
be routed to any output or combination of outputs. This allows great flexibility in
accommodating a variety of applications and requirements.
The AP800 features numerous functions which greatly enhance its
performance and flexibility. For example, it can gate mics on and off when the
sound within a mic’s acceptance pattern reaches a certain level.
The AP800 monitors each mic independently, observing ambient levels and
making decisions based on each mic’s environment. Thus, the input for a mic
located in a highly reverberant part of a conference room is gated, mixed, and
processed to compensate for the changes in that area and reduce echo and noise.
This improves audio quality and decreases the possibility of feedback.
The AP800 facilitates local and remote PC setup and diagnostics, logic
outputs, and automatic gated mic operation. Mic inputs can be individually
customized to gate on and off as you want, while automatic gain control keeps the
overall sound level consistent. Eight of the 12 channels can be configured as an
automatic microphone mixer.
Adjustments in routing, level, and other functions can be made through
presets activated through a rear-panel closure or an RS-232 serial interface.
Network-based interconnectivity allows up to eight AP800/AP400 units to be
connected and controlled as a single unit.
CHAPTER 1: Introduction
Product Overview

Introduction ~ Product Overview
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Features
• Gentner®Distributed Echo Cancellation®technology; each microphone has
its own echo canceller for a total of eight echo cancellers per unit
• Easy-to-use AP-Ware software for quick configuration of all functions
• 100 percent digital signal processing (DSP)
• Simultaneous direct connection to several video codecs and
telephone lines (using AP10 Telephone Interfaces)
• 12x12 matrix mixer
• Two internal submixing buses for mixing and level control in sound
reinforcement systems
• All automatic microphone functions and operating modes operate across
expanded units
• Input gain, audio processing, equalization, muting, and automatic mixer
programmable per input channel
• Expandable using a high-speed digital network bus; a total of eight AP800s
and 16 AP10s can be interconnected for up to 64 mic inputs and 96 line
outputs
• All G-Linked devices can be accessed, controlled, and programmed via a
single RS-232 connection
• Six programmable presets for instant configuration changes
• Lockout front-panel access for security

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Introduction ~ Professional Services Group
Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
If you need any additional information on how to install, set up, or operate your
system, please contact us at one of the locations listed below. We welcome and
encourage your comments so we can continue to improve our products and serve
your needs.
ClearOne Communications ~ 1825 Research Way ~ Salt Lake City, UT 84119
Technical Support
Telephone: [phone] (USA) or 1.801.974.3760
Fax: [phone]
E-mail: [email protected]
Web site: www.clearone.com
Sales and Customer Service
Telephone: [phone] (USA) or 1.801.975.7200
Fax: [phone] (USA) or 1.801.977.0087
E-mail: [email protected]
ClearOne Communications EuMEA GmbH
Leonhardstr. 16-18, D-90443 Nuremberg, Germany
Telephone: [phone]
Fax: [phone]
E-mail: [email protected]
Product registration
Please register your AP800 online by visiting ClearOne Technical Support at
www.clearone.com. When your product is properly registered, ClearOne
Communications is better able to serve you should you require technical assistance.
Registration information is also used to notify you of upgrades and new product
information.
Product returns
All product returns require a return authorization (RA) number. Please contact
ClearOne Technical Support before attempting to return your AP800 unit.
Professional Services Group

Introduction ~ Unpacking
Ensure that the equipment shown below was received with your shipment.
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Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
Unpacking
www.gentner.com
Audio Products
AP800 Audio Conferencing System
Gentner Corporation ~ 1825 ResearchWay, Salt Lake City, UT 84119 ~ tel [phone] ~ fax [phone]
Installation & Operation Manual
AP800 Installation
and Operation Manual
Optional
Figure 1.1. Equipment
ClearOne is not responsible
for product damage
incurred during shipment.
You must make claims directly with
the carrier. Inspect your shipment
carefully for obvious signs of
damage. If the shipment appears to
be damaged, retain the original
boxes and packing material for
inspection by the carrier. Contact
your carrier immediately.
!
Controls and Connections
ABCE
F
D
Figure 1.2. Front panel controls Front panel
A. LCD. The two-line, 16-character-per-line LCD display is used for AP800
setup and level adjustments in conjunction with the four associated front-
panel buttons.
B. Enter/▲▼/ESC. These buttons are used to navigate the AP800’s menu
system.
C. LED Meter. The LED bar meter is displays the audio level of any selected
input or output on the AP800, as well as display echo return loss (ERL) and
echo return loss enhancement (ERLE) for mic channels 1–8.
The front panel buttons
are also used to enter the
front panel passcode. See
Lock Panel (page 15) for more
details. The front panel passcode
can also be established in AP-Ware.
Refer to the AP-Ware help file for
more information.
✍

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Introduction ~ Controls and Connections
Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
D. Meter. The Meter button takes you directly to the Meter branch of the
AP800’s LCD programming tree.
E. System, Inputs, Outputs, Routing. These buttons provide direct access to
the corresponding sections in the LCD menu.
F. Mic On LED. These LEDs indicate microphone gate status.
Rear panel
A. Power. This power module accommodates power ranging from
100–240VAC, 50/60Hz. No switching is required.
B. Inputs A–D. These connectors are used with line-level inputs. Line level
inputs can be mixed in any combination with the gated inputs to any of the
eight outputs. Nominal input is 0dBu. Mix level can be easily set for each
non-gated input.
C. Outputs A–D, 1–8. These connectors allows eight line-level outputs to be
connected to the unit. Outputs can include video codecs, AP800s, AP10
Telephone Interfaces, and VCRs. These outputs can be configured to contain
any combination of gated and non-gated inputs. The nominal output level is
0dBm.
D. Mics 1–8. Up to eight mic/line-level inputs (selectable) can be connected
using the three-terminal Phoenix connector(s).
E. G-Link In, Out. These RJ-45 connectors are part of the AP800’s high-speed
digital bus network, which passes audio between units.
F. RS-232. This female DB-9 serial port is for connection between the AP800
and a PC, modem, or other custom remote control. For serial
communications protocol, see Appendix F, page 39.
G. Control/Status A and B. These two DB-25 connectors are used to interface
parallel control to the AP800. Most of the pins on these connectors can be
programmed to perform any function via a closure to ground. For pinouts,
including a description of the default settings, see Appendix D on page 36.
AB
C
D E F G
Figure 1.3. Rear panel connections
For electrical
specifications, see
Specifications on page 33.
✍

Introduction ~ G-Link Network
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G-Link network architecture allows up to eight AP800s/AP400s and up to 16 AP10
Telephone Interfaces to be controlled as if all were part of a single unit.
Digital technology can provide a distinct advantage in designing and
controlling teleconferencing systems. The ability to network with additional AP
units (for a maximum of 64 mic inputs) makes the Audio Perfect systems ideal for
room combining applications or larger applications which require more
microphone inputs.
The G-Link gives you the ability to interconnect the AP800 with other Audio
Perfect units (additional AP400s, AP10s, and AP800s). The maximum distance
between connected ClearOne units is 20 feet/6.1 meters. ClearOne Communications
recommends that category five twisted-pair (10Base) cable be used. Control of
connected AP800s and AP10s is also possible via a single COM port.
G-Link bus
This digital mix-minus bus appears on every Audio Perfect product. It allows audio
to be routed to any destination on the G-Link network. The AP800 has four digital
buses: X-bus, Y-bus, Z-bus, and G-Link EC Reference bus.
•X-bus. This mix-minus bus is defined as the master microphone mix, and it
supports NOM (see page 24). All gated microphones are default routed to
this bus.
•Y-bus. This mix-minus bus is defined as the line input master mix. All line-
level audio such as from video codecs, AP400s, AP10 Telephone Interfaces,
VCRs, etc. are default routed to this bus.
•Z-bus. This mix-minus bus is a user-defined auxiliary mix bus.
•G-Link EC Reference bus. This bus provides a system-wide echo canceller
reference signal. It allows for the reference signal to be passed to additional
G-Linked mic channels and their associated echo cancellers. Typically, one
output on one unit will be passed along the G-Link EC Reference bus.
G-Link Network
A G-Link network will
allow interconnection of
up to eight
AP800s/AP400s and 16 AP10s.
✍
When multiple AP800s
are used in a system, the
gating parameters on all
units must be set the same.
✍

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
CHAPTER 2: Installation
Power requirements
The AP800 will accommodate an AC voltage-input of 100–240VAC, 50/60Hz, 30W.
Auxiliary equipment
Any auxiliary equipment to be used with the AP800 (i.e., AP400, AP10 Telephone
Interface, AP IR Remote Control, desktop kit, microphones, speakers, recording
equipment, etc.) should be available at time of installation.
Equipment placement
The AP800 is designed for mounting in a 19" equipment rack. Do not block any of
the unit’s ventilation holes. With a desktop kit, the unit can be adapted for tabletop
placement.
Environmental requirements
The AP800 can be safely operated in a room with varying temperatures between 32°
and 110°F (0-43°C).
Equipment Requirements

The AP800 is designed for easy installation and setup. All connections are made
through rear-panel connectors. This chapter provides instructions on installing the
units and making initial connections, creating a G-Link network, assigning device ID
numbers, selecting the mixer mode, and using the LCD menu.
The diagram below illustrates the typical connections that are made for a
single-unit AP800 system. The default routing settings in AP-Ware allow the
AP800 to work out of the box for this type of installation.
Connecting the unit
To connect the AP800
1. Place the unit in a standard 19-inch rack and attach it securely.
2. If you are using a custom controller for control and status, connect it to the
Control/Status port [G].
Installation ~ Installation
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Tape Player (Optional)
Control System
or PC (Optional)
Speakers
External Power Amp
Logic Out
Status and
Control
Telephone
Set
AP10
Analog Telephone Line
AP800
G-Link
Terminator
G-Link
Terminator
Video
CODEC
REMOT E TRANS MIT
INPUT RE CEIV E
OUTPUTG-LINK
IN OUT
TEL CO
LINE S ET
V
OLTAGERANGE 100 v-240V 2A
FREQUENCY50H z/60Hz
Hardware Setup
Figure 2.1. Completed AP800 installation
AB
C
D E F G
Figure 2.2. Rear Panel Connectors

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3. If you are using an external RS-232 controller or the AP IR remote,
connect it to the RS-232 port [F].
4. Wire the inputs and outputs to the AP800 using the provided three-terminal
Phoenix push-on connectors. These connectors are designed for easy wiring;
simply insert the desired wire into the appropriate connector opening and
tighten down the top screw.
•Mic 1–8 [D] Mic or line level inputs
•Inputs A–D [B] Line level inputs only
•Outputs A–D, 1–8 [C] Line level outputs
When connecting, use the screened legend on the back of the unit;
overlapping from one channel to another can cause improper operation.
5. Connect the speaker wire to the + (red) and –(black) binding post
connectors. A 4–16Ωspeaker can be directly connected to the XAP 400,
eliminating the need for an external power amplifier.
6. Plug in the AP800 to complete the installation. The power output [A] will
operate at any level between 100–240VAC and 50–60Hz.
If you are installing only one AP800 and are not connecting it to any other AP units,
you have completed the hardware installation.
G-Link connections
Using the G-Link connectors, you can connect up to eight AP800/400s and 16 AP10
units, where the total number of microphone inputs does not exceed 64. Make
connections between units in daisy-chain fashion using the short RJ-45 jumper
(provided). If your units are further apart (maximum distance 20 feet/6.1 meters),
use category-five twisted-pair cable (10 BaseT).
For a single-unit system, no connection is required in either G-Link In or
G-Link Out connectors.
The three terminals in
the Phoenix connector
correspond with the rear-
panel audio contacts (from left to
right): + (positive), – (negative),
and
 (ground).
✍
Figure 2.3. Phoenix push-on connector
A G-Link network supports
connection of a maximum
of any combination of 8
AP400s and AP800s. It also
supports up to 16 additional AP10s,
for a maximum of 24 telephone
lines.
✍
Networking Units

Installation ~ Installation
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To create a G-Link network
1. Insert a G-Link terminator (provided) in the G-Link In connector of the first
unit in the network.
2. Connect the RJ-45 jumper cable (or Cat. 5 twisted-pair cable) to the G-Link
Out connector of the first unit and to the G-Link In connector of the second
unit. Continue connecting units in the same fashion.
3. Plug the G-Link terminator in the G-Link Out connector on the last unit to
complete the network connections.
Device IDs
Once your physical G-Link network is established (and if you have more than one AP
unit at a site), you need to specify unique device ID numbers for each AP800 on the
network. As shipped from the factory, all AP800 units default as device ID “0”. Set
device ID numbers for each unit at your site by manipulating the front-panel LCD.
To set the device ID
1. Press the System button, then scroll to Device ID.
2. Press Enter, then scroll through the eight (0–7) options.
3. Press Enter to select the appropriate device ID.
Repeat this process for each
AP product on the G-Link network.
If the same Device ID is assigned to more than one unit of the same type on
the G-Link network, Meter LED “+12”will flash red and Meter LED “0”, “-4”,
“-30”, and Mic 4 will flash green on the affected units. To correct the problem,
change the device ID on one of the units.
AP800 unit 0
AP800 unit 2
G-Link
Terminator
G-Link
Terminator
AP800 unit 1
Figure 2.4. G-Link Network Connection

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Device types
Device IDs are automatically assigned a device type. AP800s are always device
type “1”(AP400 device types are “3”, AP10 device types are “2.”). The device
ID # selected is added to the device type “3”to generate the unique address for
that unit. For example, the first AP800 unit in your G-Link network would be
identified as “10”, “3”being the Device Type, and “0”being the Device ID.
Mixer Mode
Once your physical G-Link network is established and unique G-Link device ID
numbers for each unit on the network are set, the mixer mode must be set. There are
four mixer-mode settings (see Figure 2.5): master-single (default), master-linked,
slave, and dual mixer.
•Master-single must be used when only one AP800 is used in a system;
however, only one AP800 can be designated as master-linked when multiple
AP800s are used in a system.
•Master-linked denotes the master AP800 unit when more than one unit is on
the network.
•Slave is used for all networked units that are not designated as master-
linked, master-single, or dual mixer. If there are two units networked, one
must be set with the master-linked parameter, the other must be set with the
slave parameter.
•Dual mixer is used when a single AP800 is used as two distinct mic mixers.
A system is defined as one or more units that communicate to perform mixing
functions. A system can consist of one unit in master-single or dual mixer mode, or
several units that work together with one master-linked unit and multiple slave
units. Systems can be G-Linked together for easy reconfiguration. The physical
location on the G-Link network determines which system individual units belong
to. In Figure 2.5, for example, AP800 Device 4 has been designated as master-
linked. The units located below this unit on the G-Link network constitute System
3, while units above it belong to different systems. The entire network could be
easily reconfigured into one system by changing the mixer mode on Devices 3 and
4 to slave units which would then refer to the only master-linked unit on the
system: AP800 Device 0.
When using the dual mixer parameter, a single AP800 unit can be used as
two distinct mic mixers, allotting Mics 1–4 and Outputs 1–4/A–B to one mixer,
and Mics 5–8 and Outputs 5–8/C–D to the second mixer.
1
2
3
0
Figure 2.5. Multiple AP Systems (multiple
AP800s, multiple AP10s)
A dual-mixer AP800 acts
as a closed system. This
parameter cannot be used if
the unit needs to link audio with other
AP800 units on the G-Link network
within a single system.
✍

Installation ~ Installation
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Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
To set mixer mode
1. Press the System button. Scroll through the menu until you see Mixer Mode.
2. Press Enter, then scroll through the three options.
3. Press Enter at the appropriate option to select it.
4. Repeat this process for all AP units in the G-Link network.
EC reference
Multiple units to one speaker output note: When multiple AP800 units are linked
together and are using only one output channel to drive the speaker system, this
output must be defined for the entire system as the sample reference for echo
cancellation. In other words, the output which the master unit will use as the EC
reference must be identified to the slave units via the G-Link. See page 25 for details
on echo cancellation setup for multiple units.
Errors
A synchronization error occurs when slave units are not receiving a signal from the
master unit. Meter LED “+12”will flash red and Mic LEDs “1,”“2,”and “4”
will flash green on affected slave units. The error is a result of one of two problems:
incorrect master/slave configuration or a broken G-Link connection.
If it is a master/slave configuration error, LEDs will flash on a unit that is
designated as a slave unit but does not have a master unit. To correct the problem,
make certain that Mixer Mode for the master unit is set to Master-Linked and not
to Master-Single or Dual Mixer.
If the error is in the G-Link connection, LEDs will flash on any units that are
not physically connected to the master unit. To correct the problem, check for
broken connections and reconnect the G-Links.

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Installation ~ LCD Programming
Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760
The AP800’s front panel is simple and intuitive to operate, thanks to its front-panel
user interface: a 2x16 character LCD, previously described menu buttons, level LED
bar meter and gate LED bar meter.
When power is applied to the AP800, the LCD panel will first read
INITIALIZING. If an error is displayed, contact technical support. If initialization
is completed without any errors, a title screen is displayed, including the product
name (top line) and the version number (bottom line). The title screen remains on
display until an event occurs (i.e., a button is pressed) that writes information to
the LCD panel or a device conflict error is detected.
Menu Trees
There are five menu trees (menu categories): meter, inputs, outputs, routing, and
system. All menu items are arranged under these menus. To enter one of the five
menu trees or to move from one menu tree to another, press the corresponding
category button.
The menu trees are structured in levels such that the first level (top of the
tree) branches into multiple subcategories. These branches typically end when an
adjustable parameter or viewable value is reached (see Figure 2.6).
Navigating the menu items
Use the ▲and ▼buttons to scroll through the menu items at a particular level.
When you reach the last menu item, the display scrolls back to the beginning of the
list, and vice-versa. If you hold down an ▲/▼button, the scrolling speed increases.
To descend a menu level (go deeper into the tree), press Enter. To ascend a
menu level (go back toward the top of the tree), press Esc.
Switching from one main menu category to another
To switch between main menu categories, press the System, Routing, Outputs, Inputs,
or Meter buttons. If the menu tree is left inactive for a period of time (see Timeout,
page 20), the LCD reverts to the title screen.
Easy, complete AP system
configuration is also
available with AP-Ware
software. See Chapter 3, AP-Ware
Software, and the AP-Ware help file
for more information.
LCD Programming
✍
Pressing ESC at the top of
the menu tree has no
effect.
✍

Installation ~ LCD Programming
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Power-Up Screen
OutputsInputsSystem Routing Meter
Select Preset
Lock Panel
Set Passcode
Device ID
Unit ID #
Mixer Mode
Gate Parameters
RS-232
Inputs 1-8
Inputs A,B,C,D
Subbus 1,2
Output 1-8
Output A,B,C,D
Route to
Outputs 1-8
Route to
Outputs A,B,C,D
Route to
Subbus 1,2
Route to
G-Link X,Y, Z
Route to
EC Reference 1,2
Route to
G-Link EC Ref
Inputs
Outputs
ERL
ERLE
Default Meter
ClearOne AP800
Version X.X
Figure 2.6. LCD menu tree
Adjusting a value
To adjust a parameter, first verify that it is flashing. If the parameter is not flashing,
it cannot be adjusted. If the parameter is flashing, adjust the value with the ▲and
▼buttons. As the value is adjusted, the parameter is updated immediately. For
example, if you adjust input gain, you should be able to hear the difference as it
changes. To store the new value, press Enter. To discard the change and revert back
to the old value, press Esc. If you press a menu category button while a parameter is
being adjusted, it is the same as pressing the Esc key.
In general, while adjusting parameters, numerical values do not wrap around
when the end is reached. However, parameters that toggle between two values (or
are a list of values) will wrap around. When adjusting a parameter and a ▲/▼
button is held, after 2 seconds the parameter will scroll through its values at a
faster rate.

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System parameters
There are eight system-level parameters (see Figure 2.6, previous page) with which
an AP800 can be programmed: select preset, lock panel, set passcode, device ID,
unit ID number, mixer mode, gate parameters, and RS-232. For default settings, see
the programming worksheet (page 59). Bolded items are the factory defaults.
Select Preset
The Select Preset menu item allows one of six presets to be selected for AP800 use.
These preset configurations can be easily loaded via the LCD display or by serial
commands to the RS-232 port. For example, the AP800 can be set up for different
room microphone configurations (e.g. Preset 1 for a two-mic presentation, Preset 2
for an eight-mic conference, Preset 3 for a three-mic priority panel discussion with
20 mics for audience questions, etc.).
To select a preset, scroll through the numbered presets until the desired preset
is visible, then press Enter. The preset will immediately be loaded into AP800
memory for active use.
Lock Panel
The front panel can be locked to prevent unauthorized adjustments to the AP800.
Menu items can still be viewed when the panel is locked, but settings cannot be
altered or entered until the panel is unlocked by entering the appropriate passcode.
To lock the front panel
1. Press the System button.
2. Scroll through the menu items to select Lock Panel, and press Enter.
3. Select On, and press Enter again.
To unlock the front panel
1. Attempt to adjust a parameter. The AP800 prompts you for the passcode.
2. Begin entering the passcode. Once you have correctly entered the fifth
character, the front panel unlocks. (The default passcode for all units is
▲▲▼▼Enter.)
Set Passcode
Once the AP800 is unlocked, the passcode can be changed. Before the AP800 will
allow passcode changes, the new passcode must be entered, then re-entered for
validation.
If you enter a passcode and
unlock the system, you
must lock it again after
making any changes. Otherwise the
panel will remain unlocked and
accessible to anyone.
✍
Refer to the AP-Ware help
file for complete
information about
establishing presets.
✍

Installation ~ LCD Programming
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A good way to remember the new passcode would be to create a word using
the first letters of the buttons. For example, using Rooms as the passcode would be
the key sequence: routing, output, output, meter, system. The passcode must be
five characters long.
Device ID
The AP800’s device ID is set in the Device ID menu selection. There are eight
G-Link network positions (0–7). See Device IDs, page 10.
Unit ID
The Unit ID menu selection allows for accessing the read-only address set at the
factory. This unique ID number identifies the particular unit and cannot be changed.
Gate Parameters
There are nine gate parameters that can be adjusted via the front-panel LCD (see
Figure 2.7). The parameters in this submenu include last mic mode, maximum
numbers of mics, PA adaptive mode, first mic priority, gate ratio, off attenuation,
hold time, decay rate, and manual ambient.
PA Adaptive Mode
The AP800 recognizes how much loudspeaker audio is picked up by the microphones
and uses this level as the new ambient level when audio is present at the power
amplifier (see Figure 2.8). This prevents loudspeaker audio from gating on a
microphone while still allowing people in the room to gate on microphones as they
speak. This mode can be turned on (default) or off by selecting the option and
pressing Enter. ClearOne Communications recommends leaving this feature on.
Figure 2.7. Gate Parameters LCD
submenu
Ambient Level
Gate Ratio
New Ambient Level
New Gate Ratio
When the AP800 detects
audio in the power amplifier,
it increases the ambient level
to match the level of the
speaker audio at the
microphones.This prevents
the speaker audio from
turning on the microphones.
Figure 2.8. PA adaptive mode