Crestron QM-WMIC
Wall Plate Media Center Microphone Input
Operations & Installation Guide
This document was prepared and written by the Technical Documentation department at:
Crestron Electronics, Inc.
15 Volvo Drive
Rockleigh, NJ 07647
1-888-CRESTRON
All brand names, product names and trademarks are the property of their respective owners.
©2003 Crestron Electronics, Inc.
Crestron QM-WMIC Wall Plate Media Center Microphone Input
Contents
Wall Plate Media Center Microphone Input: QM-WMIC 1
Introduction......................................................................................1
Features and Functions ..........................................................1
Specifications......................................................................... 3
Physical Description ..............................................................5
Industry Compliance..............................................................7
Installation........................................................................................ 8
Setup...............................................................................................11
Programming Software ..................................................................11
Programming with Crestron SystemBuilder...........................12
Programming with SIMPL Windows..................................13
Programming with VisionTools Pro-e.................................17
Example Program ................................................................ 17
Adjusting the QM-WMIC..............................................................18
Definitions ...........................................................................18
Setting Microphone Gain.....................................................20
Setting the Gating Level ......................................................20
Problem Solving............................................................................. 22
Troubleshooting...................................................................22
Further Inquiries ..................................................................24
Future Updates.....................................................................24
Return and Warranty Policies ........................................................ 25
Merchandise Returns / Repair Service ................................25
CRESTRON Limited Warranty ..........................................25
Operations & Installation Guide - DOC. 6245 Contents • i
Crestron QM-WMIC Wall Plate Media Center Microphone Input
Wall Plate Media Center
Microphone Input: QM-WMIC
Introduction
Features and Functions
The Wall Plate Media Center Microphone Input (QM-WMIC) is an
optional part of the Crestron MediaManager™ line of network devices,
room control systems, and signal routing solutions.
The QM-WMIC is a complementary accessory that can only be used
when installed with a Crestron
The QM-WMIC adds two Neutrik
software enabled phantom power to the A/V connections that are present
on the QM-WMC. The microphone inputs feature adjustable gain and an
integrated noise gate with adjustments for gating level, attack time, and
decay time. The microphone signals are transmitted with the program
audio over the Crestron QuickMedia transport.
A QM-WMIC requires a QM-WMC, the far-right space in a 2½” deep,
triple-gang electrical box and a Decora
for installation.
Functional Summary
• 3-gang Decora style (requires installation with QM-WMC)
®
QM-WMC Wall Plate Media Center.
®
Combo microphone connectors with
®
style faceplate (sold by other)
• Two Neutrik Combo microphone connectors with muting and
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 1
software switchable phantom power (48V @ 10mA) for
condenser microphones
• Adjustable gain, noise gate levels, attack time, and decay time
Wall Plate Media Center Microphone Input Crestron QM-WMIC
The following block diagram illustrates the functional capabilities of a
QM-WMC with the QM-WMIC installed.
Block Diagram of Wall Plate Media Center Microphone Input
2 • Wall Plate Media Center Microphone Input: QM-WMIC Operations & Installation Guide - DOC. 6245
Crestron QM-WMIC Wall Plate Media Center Microphone Input
Specifications
The following table provides specifications for the QM-WMIC.
Specifications for the QM-WMIC
SPECIFICATION DETAILS
Power Requirements
Total QM-WMC & QM-WMIC
Control System Update Files
2-Series Control System Version 3.093.CUZ or later
Front Connectors
Mic Inputs (2) Neutrik Combo: XLR & ¼”
Rear Connectors
QM-WMC (1) Multi-pin ribbon connector for
Microphone
XLR
Concentric ¼” Accepts line level inputs,
1,2
3 Watts (0.13 Amp @ 24 VDC)
8 Watts (0.33 Amp @ 24 VDC)
phone per input
connecting to QM-WMC
Accepts microphones with 60
Ohm to 600 Ohm output
impedance, balanced
balanced (tip/ring/sleeve) or
unbalanced (tip/sleeve)
Input Level Range
XLR
¼”
Max. Input: 4 Vrms balanced
-60 dBV to –20 dBV
-28 dBV to +12 dBV balanced
(-30 dBu to +10 dBu)
-28 dBV to +6 dBV unbalanced
(-30 dBu to +4 dBu)
2 Vrms unbalanced
(continued on next page)
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 3
Wall Plate Media Center Microphone Input Crestron QM-WMIC
Specifications for QM-WMIC (continued)
SPECIFICATION DETAILS
Microphone (continued)
Input Impedance
XLR: 10 kΩ
¼”: 4 kΩ balanced
2 kΩ unbalanced
Level Monitoring Provided for setup purposes.
Nominal indication at 20 dB
below input clip level. Clip
indication reported at 6 dB below
input clip level.
Noise Gate Software enabled noise gating
with adjustable level, attack time,
and decay time (variable from 10
ms to 5 seconds).
Phantom Power (XLR only)
Voltage
Current
Source Impedance
Operating Temperature and
Humidity
Software enabled
48 V
10 mA (combined total)
3.4 kΩ
41º to 104º F (5º to 40º C)
10 to 90% relative humidity
3
(non-condensing)
Dimensions and Weight Width: 1.77 in (4.49 cm)
Height: 4.11 in (10.44 cm)
Depth: 2.14 in (5.43 cm)
Weight: 4.1 oz (0.12 kg)
1. The latest software versions can be obtained from the Downloads | Software
Updates section of the Crestron website (www.crestron.com). Refer to the
NOTE following these footnotes.
2. Crestron 2-Series control systems include the AV2, C2N-DVP4DI,
CP2, CP2E, MC2E, MC2W, MP2, MP2E, PAC2, PRO2, QM-RMCRX, and
RACK2.
3. Phantom power is applied to the XLR connectors of both microphone inputs.
It cannot be enabled on an individual microphone input.
NOTE: Crestron software and any files on the website are for Authorized
Crestron dealers and Crestron Authorized Independent Programmers
(CAIP) only. New users may be required to register to obtain access to
certain areas of the site (including the FTP site).
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Crestron QM-WMIC Wall Plate Media Center Microphone Input
Physical Description
The QM-WMIC features two Neutrik Combo XLR/¼” ports that allow
for connection of up to two microphones. The XLR microphone
connectors feature software switchable phantom power for use with
condenser microphones. Microphone signals are transmitted along with
the program audio and can be manipulated at the receiver.
NOTE: Phantom power is applied to the XLR connectors of both
microphone inputs. It cannot be switched on an individual microphone
input.
An LED on the front of the QM-WMIC indicates whether phantom
power is enabled. The following illustration shows the QM-WMIC
properly installed with a QM-WMC.
NOTE: Decorative faceplates, as shown in the following illustrations,
are not supplied.
QM-WMIC Shown with QM-WMC
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 5
Wall Plate Media Center Microphone Input Crestron QM-WMIC
Physical Views of the QM-WMIC Wall Plate Media Center
2.71 in
(6.89 cm)
2.14 in
(5.43 cm)
1.79 in
(4.54 cm)
1.77 in
(4.49 cm)
1.63 in
(4.14 cm)
4.11 in
(10.44 cm)
All microphone connections to the QM-WMIC are made through the
connectors on the front panel. An LED on the front of the QM-WMIC
indicates when phantom power is on. The connection to the QM-WMC is
made on the rear of the unit. Refer to the illustrations and descriptions
that follow.
6 • Wall Plate Media Center Microphone Input: QM-WMIC Operations & Installation Guide - DOC. 6245
Crestron QM-WMIC Wall Plate Media Center Microphone Input
NOTE: A ribbon cable for connecting to a QM-WMC is provided with
the QM-WMIC.
NOTE: Images shown are for illustrative purposes only.
MIC 1 / MIC 2
Each MIC port is a Neutrik Combo connector that contains an XLR
connector for use balanced condenser or dynamic microphones. The XLR
connectors feature switchable phantom power. The ¼” phone connector is
for use with devices that provide line-level signals such as wireless
microphone receivers or the output of a microphone mixer. For more
information on the microphone input capabilities, refer to the
“Specifications” section on page 3.
NOTE: Phantom power is not applied to the ¼” inputs.
Phantom Power Indicator
The QM-WMIC has an LED that illuminates when phantom power is
enabled on the XLR connectors.
Connection for QM-WMC (not labeled)
This 14-pin connector is used to connect the QM-WMIC to the QM-WMC.
Industry Compliance
As of the date of manufacture, the QM-WMIC has been tested and found
to comply with specifications for CE marking and standards per EMC
and Radiocommunications Compliance Labelling (N11785).
NOTE: This device complies with part 15 of the FCC rules. Operation is
subject to the following two conditions: (1) this device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 7
Wall Plate Media Center Microphone Input Crestron QM-WMIC
Installation
The QM-WMIC is designed to connect to a dedicated connector on the
rear of the QM-WMC Wall Plate Media Center.
The following tools/hardware are required for installation.
• Wire nut (not supplied)
• Phillips screwdriver (not supplied)
• Two ¾” pan head Phillips screws (supplied)
NOTE: The QM-WMIC can be installed when the QM-WMC is being
installed or after the QM-WMC has been installed. The following
procedure is written for a scenario where the QM-WMIC is being
installed at the same time as a QM-WMC. Detailed installation
instructions for the QM-WMC can be found in the latest revision of the
QM-WMC Operations & Installation Guide (Doc. 6237) which can be
downloaded from the Downloads | Product Manuals section of the
Crestron website (www.crestron.com
).
NOTE: If the QM-WMIC is to be installed into an existing QM-WMC
installation, all electronic connections to the QM-WMC should be
removed prior to removing the QM-WMC from its two-gang electrical
wallbox. A three-gang box must replace the two-gang electrical wallbox.
1. Turn Cresnet system power OFF.
2. Place the QM-WMIC next to the QM-WMC as shown in the
following diagram.
8 • Wall Plate Media Center Microphone Input: QM-WMIC Operations & Installation Guide - DOC. 6245
Crestron QM-WMIC Wall Plate Media Center Microphone Input
C
Align QM-WMIC with QM-WMC
GROUND WIRE
QM-WM
GROUND WIRE
QM-WMIC
14-PIN RIBBON CONNECTORS
3. Using the supplied ribbon cable, connect the 14-pin connectors
on the rear of the QM-WMIC and QM-WMC.
4. Remove the precut insulation from the ground wires.
5. Using a wire nut, group the ground wires on the QM-WMIC
and the QM-WMC and connect them to ground. Suitable
grounding methods are:
• Connect the grounding wire to the electrical box (the
electrical box must be earth grounded) or a ground wire
in the electrical box.
OR
• Connect the ground wires to the Cresnet shield and
connect the Cresnet shield at the QM-RMCRX to the
chassis of the QM-RMCRX. The QM-RMCRX chassis
must be connected to an earth ground. In this instance,
the Cresnet shield is not connected to Cresnet ground.
NOTE: When the Cresnet shield is used to connect
QM-WMC/QM-WMIC assembly to the ground terminal
of a PRO2, PAC2, AV2, or any other 2-Series control
system where the chassis is already earth grounded, the
grounding wire from the control system to earth ground
is unnecessary.
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 9
Wall Plate Media Center Microphone Input Crestron QM-WMIC
6. Connect the network and QuickMedia cables to the rear of the
QM-WMC.
7. Make sure the QM-WMC and QM-WMIC are properly
oriented (labels are upright), and place it in the electrical box.
CAUTION: Excess wire that is pinched between the wall plate and
electrical box could short out. Make sure that all excess wire is
completely inside the electrical box and not between the box and the wall
plate.
8. Attach the wall plate to the electrical box using the supplied ¾”
pan-head screws as shown in the following diagram.
Install Wall Plate into Wall Box
3-GANG ELECTRICAL BOX -
1
INCH MINIMUM DEPTH
2
2
(NOT SUPPLIED)
QM-WMIC MUST BE MOUNTED TO THE
RIGHT OF THE QM-WMC
3
6-32 X
TO MOUNT TO ELECTRICAL BOX
INCH PAN HEAD SCREW (SUPPLIED)
4
9. Attach an appropriate Decora (or equivalent, not supplied)
faceplate.
10. Turn Cresnet system power ON.
10 • Wall Plate Media Center Microphone Input: QM-WMIC Operations & Installation Guide - DOC. 6245
Crestron QM-WMIC Wall Plate Media Center Microphone Input
Setup
A QM-WMC with the QM-WMIC is connected to a Cresnet network just
like a standard QM-WMC. For instructions on connecting and addressing
the QM-WMC in a Cresnet network, refer to the latest revision of the
QM-WMC Operations & Installation Guide (Doc. 6237) which can be
downloaded from the Downloads | Product Manuals section of the
Crestron website (www.crestron.com
).
Programming Software
Have a question or comment about Crestron software?
Answers to frequently asked questions (FAQs) can be viewed in the
Online Help section of the Crestron website (www.crestron.com
http://www.crestron.com/accounts/login.asp
view questions you have submitted to Crestron’s True Blue Support.
First-time users will need to establish a user account.
to post your own question or
). Go to
NOTE: Since the QM-WMIC is integrated into the QM-WMC, this
section will only cover topics that are specific to the QM-WMIC. For
information on programming the QM-WMC, refer to the latest revision
of the QM-WMC Operations & Installation Guide (Doc. 6237) which can
be downloaded from the Downloads | Product Manuals section of the
Crestron website (www.crestron.com
Setup is easy thanks to Crestron’s Windows-based programming
software. Crestron’s SystemBuilder™ software creates a complete
project, with no special programming required. SystemBuilder completes
all necessary programming for a base system including all touchpanel
screens and the control system program. The program output of
SystemBuilder is a SIMPL Windows program with much of the
functionality encapsulated in macros and templates. Once SystemBuilder
creates the project, the system interfaces and program logic can be
customized in SystemBuilder or can be easily modified with Crestron
development tools (i.e., SIMPL Windows and Crestron VisionTools
Pro-e (VT Pro-e) software packages).
).
®
SystemBuilder comes with templates for all supported interfaces. If a
user wishes to create a touchpanel project using templates with a
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 11
Wall Plate Media Center Microphone Input Crestron QM-WMIC
p
f
different look-and-feel, this can be accomplished by making a custom
template. This custom template can then be used by SystemBuilder to
create the final project files to be loaded into the panels. Alternatively,
VT Pro-e can be used to tweak projects created with the SystemBuilder
or develop original touchpanel screen designs.
Once the program created by SystemBuilder is loaded into the control
system, Crestron’s Digital Media Tools (DMT) software can be used to
tune the system for optimal performance. DMT software can be used to
test the quality of microphone signals as well as fine-tune microphone
settings.
NOTE: Crestron recommends the use of SystemBuilder and Digital
Media Tools software for creating and fine-tuning a QuickMedia system.
NOTE: Crestron recommends that you use the latest software to take
advantage of the most recently released features. The latest software is
available from the Downloads | Software Updates section of the Crestron
website (www.crestron.com
).
The easiest
method of
rogramming,
but does not
offer as much
lexibility
as SIMPL
Windows.
The following are recommended software version requirements for the
PC:
• (Optional) SystemBuilder (first release due in fourth quarter of
2003). Requires SIMPL Windows.
• SIMPL Windows version 2.05.08 or later. Requires SIMPL+
Cross Compiler version 1.1.
• Crestron Database version 16.0.5 or later. Required by SIMPL
Windows.
• Digital Media Tools software version 3.00.00 or later.
Programming with SystemBuilder
SystemBuilder can automatically program MediaManager systems for
residential and commercial applications such as meeting rooms, home
theater, video conferencing, and lighting. The interface of this tool guides
you through a few basic steps for specifying the control system,
touchpanels, network devices, and functionality. SystemBuilder then
programs the system, including all touchpanel projects and control
system logic.
®
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Crestron QM-WMIC Wall Plate Media Center Microphone Input
Selection of QM-WMC and QM-WMIC in SystemBuilder
SystemBuilder integrates fully with Crestron’s suite of software
development tools, including SIMPL Windows, VT Pro-e, and the
Crestron Database. SystemBuilder accesses these tools behind the scenes,
enabling you to easily create robust systems.
Programming with SIMPL Windows
The QM-WMC device in SIMPL Windows contains the symbols for the
QM-WMC and the QM-WMIC. For instructions on adding a QM-WMC
to a SIMPL Windows program, refer to the latest revision of the
QM-WMC Operations & Installation Guide (Doc. 6237) which can be
downloaded from the Downloads | Product Manuals section of the
Crestron website (www.crestron.com
NOTE: While SIMPL Windows can be used to program the
QM-WMIC, it is recommended to use SystemBuilder and Digital Media
Tools software for configuring and tuning a QuickMedia system.
).
NOTE: The following assumes that the reader has knowledge of SIMPL
Windows. If not, refer to the extensive help information provided with
the software.
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 13
Wall Plate Media Center Microphone Input Crestron QM-WMIC
Locating the QM-WMIC Symbol
The QM-WMIC symbol is in Slot 2 of the QM-WMC symbol. Doubleclick Slot 2 of the QM-WMC symbol to view the details of the
QM-WMIC symbol.
QM-WMIC Symbol in Programming Manager
Programming Manager is where programmers “program” a Crestron
control system by assigning signals to symbols. The following describes
the QM-WMIC symbol in the SIMPL Windows Programming Manager.
NOTE: Many of the signals in the QM-WMIC symbol are used to adjust
operating parameters such as gain, gating/gating level, attack time and
decay time. For definitions and information on the effects of adjusting
these parameters, refer to “Adjusting the QM-WMIC” on page 18.
QM-WMIC symbol in SIMPL Windows Programming Manager
The following tables list the symbol’s input and output signals,
respectively, and their functional descriptions.
14 • Wall Plate Media Center Microphone Input: QM-WMIC Operations & Installation Guide - DOC. 6245
Crestron QM-WMIC Wall Plate Media Center Microphone Input
QM-WMIC Digital Input Signal Descriptions
INPUT DESCRIPTION
Mic1Mute Mutes the input signal from Mic 1 when high
Mic2Mute Mutes the input signal from Mic 2 when high
Mic1GatingEnable Enables automatic gating on Mic 1 when high
Mic2GatingEnable Enables automatic gating on Mic 2 when high
PhantomEnable Enables phantom power for both microphone
inputs when high
NOTE: Phantom power is applied to the XLR connectors of both
microphone inputs. It cannot be switched on an individual microphone
input.
QM-WMIC Analog Input Signal Descriptions
INPUT DESCRIPTION
Mic1GatingLevel Specifies gating level for Mic 1 (0 to 100%)
Mic2GatingLevel Specifies gating level for Mic 2 (0 to 100%)
Mic1Gain Specifies gain level for Mic 1 (0 to 100%)
Mic2Gain Specifies gain level for Mic 2 (0 to 100%)
AttackTime Specifies attack time (10 to 100 ms)
DecayTime Specifies decay time (10 to 5000 ms)
NOTE: AttackTime and DecayTime are applied to both microphone
inputs.
QM-WMIC Digital Output Signal Descriptions
OUTPUT DESCRIPTION
Mic1Mute-F Indicates Mic 1 is muted
Mic2Mute-F Indicates Mic 2 is muted
Mic1GatingEnable-F Indicates automatic gating on Mic 1 enabled
Mic2GatingEnable-F Indicates automatic gating on Mic 2 enabled
Mic1Gate Indicates Mic 1 gating level has been reached
Mic1Nominal Indicates Mic 1 at nominal level
(continued on next page)
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 15
Wall Plate Media Center Microphone Input Crestron QM-WMIC
QM-WMIC Digital Output Signal Descriptions (continued)
OUTPUT DESCRIPTION
Mic1Clip Indicates Mic 1 signal is at 6 dB below input
clip level
Mic2Gate Indicates Mic 2 gating level has been reached
Mic2Nominal Indicates Mic 2 at nominal level
Mic2Clip Indicates Mic 2 signal is at 6 dB below input
clip level
PhantomEnable-F Indicates when phantom power is enabled.
NOTE: The gating level indicators will still function even if the gating
function is not enabled.
NOTE: Nominal indication is reported at 20 dB below input clip level.
Clip indication is reported at 6 dB below input clip level.
QM-WMIC Analog Output Signal Descriptions
OUTPUT DESCRIPTION
Mic1GatingLevel-F Gating level feedback for Mic 1
Mic2GatingLevel-F Gating level feedback for Mic 2
Mic1Gain-F Gain level feedback for Mic 1
Mic2Gain-F Gain level feedback for Mic 2
AttackTime-F Attack time setting feedback
DecayTime-F Decay time setting feedback
NOTE: Returned values match values that were selected for the
GatingLevel, Gain, AttackTime and DecayTime inputs.
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Crestron QM-WMIC Wall Plate Media Center Microphone Input
Programming with VisionTools Pro-e
Touchpanel screens can be created in VT Pro-e to allow configuration of
phantom power, gain levels, gating levels, attack times, and decay times.
Digital Media Tools software already has these controls built in. Refer to
the section “Adjusting the QM-WMIC” on page 18 for instructions.
Example Program
An example program for the wall plate is available from the Crestron
FTP site (ftp://ftp.crestron.com/Examples
QM-WMC_QM-WMIC.ZIP.
). Search for the file named
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 17
Wall Plate Media Center Microphone Input Crestron QM-WMIC
Adjusting the QM-WMIC
Once a QM-WMIC is installed and configured, settings for gain, gating
level, attack time, and decay time must be set using the Realtime Mode in
Digital Media Tools (version 3.00.00 or later). Digital Media Tools
software can be started from the SystemBuilder application.
NOTE: Crestron recommends that you use the latest software to take
advantage of the most recently released features. The latest software is
available from the Downloads | Software Updates section of the Crestron
website (www.crestron.com
Definitions
The QM-WMIC allows for adjustments to be made to microphone input
signals. Following are definitions of terms that are commonly used when
making adjustments to the QM-WMIC.
).
Attack Time
The time it takes (in milliseconds) from when an input signal rises above
the gating level until the microphone output signal is enabled.
Clipping
A condition in which a signal level exceeds the maximum level (the
clipping level) a circuit can handle. This is usually caused by improper
gating parameters and gain settings.
Decay Time
The time (in milliseconds) from when an input signal falls below the
gating level until the microphone output signal is muted.
Gain
An adjustable amplification to accommodate varying input signal levels.
Gating
A function that mutes a microphone signal when the input sound level is
below a user-set threshold (Gating Level).
The following diagram demonstrates Clipping, Attack Time, Decay
Time, and Gating level.
18 • Wall Plate Media Center Microphone Input: QM-WMIC Operations & Installation Guide - DOC. 6245
Crestron QM-WMIC Wall Plate Media Center Microphone Input
Visual Representation of Gating Level, Clipping Level, Attack Time, and Decay
Time
SIGNAL LEVEL
MICROPHONE
INPUT
SIGNAL
Mic On
Clipping Level
Gating Level
SIGNAL LEVEL
QM
OUTPUT
SIGNAL
Attack Time
Gating Level
Reached
Mic Off
TIME
Decay Time
Gating Level Reached
Mic On
Mic Off
TIME
Attack Time Decay Time
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 19
Wall Plate Media Center Microphone Input Crestron QM-WMIC
Setting Microphone Gain
The QM-WMIC provides variable gain on the XLR and ¼” microphone
inputs. The following procedure is used to set the optimal gain for a
microphone input.
Use the Realtime Mode in Digital Media Tools to control phantom
power, gain and gate settings, and to monitor the gate, normal, and clip
level indicators. For information on using Digital Media Tools software,
refer to the extensive help information provided with the software.
NOTE: The input gain is independent of the system’s output volume
level.
1. To adjust the input gain, set the gain and noise gate to their
lowest settings. Disable the “Mute” function by removing the
check from the Mute checkbox.
2. Connect a microphone and enable phantom power if required.
3. Increase the gain while providing a “normal” sound level input
to the microphone. When the “Norm” indicator shows fairly
consistent activity, you’ve reached a good signal level for the
QM-WMIC.
NOTE: The "clip" indicator shows that the signal is clipping. Let your
ears be the judge, but when the clip indicator is active, you are
approaching or have reached distortion in your QM-WMIC signal.
Occasional clip indications on loud input are expected, but constant clip
indicator activity is a sign that the gain may be set too high.
4. Set the system output volume to a desirable listening level and
verify the gain settings by listening to the system output. Some
minor gain adjustment may be required for the “best sound” in
any specific configuration.
Setting the Gating Level
The QM-WMIC provides an input level gating function that will mute a
microphone signal when the input sound level is below a user-set
threshold. This function can be enabled or disabled via software
commands.
20 • Wall Plate Media Center Microphone Input: QM-WMIC Operations & Installation Guide - DOC. 6245
Crestron QM-WMIC Wall Plate Media Center Microphone Input
Use the Realtime Mode in Digital Media Tools to control phantom
power, gain and gate settings, and to monitor the gate, normal, and clip
level indicators. For information on using Digital Media Tools software,
refer to the extensive help information provided with the software.
The following procedure sets the optimal “gate level” for the microphone
inputs:
1. Follow the “Setting Microphone Gain” procedure on page 20 to
set the gain for each microphone input.
2. Set the noise gate level, attack and decay times to minimum.
Disable the “Mute” function by removing the check from the
Mute checkbox.
3. While providing a level to the microphone that is equivalent to
the background noise that should be gated out, increase the
noise gate level until the Gated indicator turns off. When the
input sound levels are at or below the established noise gate
level, the microphone output signal will be gated off.
4. Set the “attack time” to the minimum level and the “decay
time” to the maximum level. These settings provide the
shortest time to enable the microphone output when an input is
above the gating level, and the longest time before disabling the
microphone after such an input.
NOTE: The “attack” and “decay times” are applied to both microphone
inputs.
5. Set the system output volume to a desirable listening level.
While providing realistic voice input and background noise
levels, adjust the gating level and attack/decay times to
eliminate undesired input while providing the best content
quality.
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 21
Wall Plate Media Center Microphone Input Crestron QM-WMIC
Problem Solving
Troubleshooting
The table below provides corrective action for possible trouble situations.
If further assistance is required, please contact a Crestron customer
service representative.
QM-WMIC Media Center Microphone Input Troubleshooting
TROUBLE POSSIBLE
CAUSE(S)
QM-WMIC is not
functioning.
Microphone
does not
produce sound.
QM-WMIC is not
receiving power.
QM-WMC Net ID is
not correct.
QM-WMC Net ID is
not set to match
the Net ID specified
in SIMPL Windows.
QM-WMC Net ID is
the same as
another device’s
Net ID.
Microphone
requires phantom
power or cannot
use phantom
power.
CORRECTIVE ACTION
Check wiring connections
to QM-WMC and
QM-WMIC.
In Viewport, poll the
network to verify the Net ID
of the QM-WMC.
Verify SIMPL Windows
program for setting Net ID.
Assign a different Net ID
for the QM-WMC to match
the Net ID specified in the
SIMPL Windows program.
Enable or disable phantom
power as necessary using
controls created in the
SystemBuilder project.
Incorrect gain,
gating level, attack
time or decay time
settings.
Adjust gain, gating level,
attack time, or decay time
settings as required.
(continued on next page)
22 • Wall Plate Media Center Microphone Input: QM-WMIC Operations & Installation Guide - DOC. 6245
Crestron QM-WMIC Wall Plate Media Center Microphone Input
QM-WMIC Media Center Microphone Input Troubleshooting
(continued)
TROUBLE POSSIBLE
CAUSE(S)
Microphone
does not
produce sound.
Intermittent
microphone
output.
Microphone
produces harsh,
distorted sound.
Incorrect volume
and/or mixer
settings on
QM-RMCRX.
Incorrect peak
setting.
Poor cable
connection.
Input gain is set too
high.
CORRECTIVE ACTION
Adjust volume and/or mixer
settings on QM-RMCRX as
required.
Adjust QM-RMCRX peak
control until audio is
restored. For more
information refer to the
latest revision of the
QM-RMCRX Operations
and Installation Guide
(Doc. 6236).
Verify all cable
connections.
Lower microphone input
gain.
“Hum” in
microphone
audio.
QM device is
improperly
grounded.
Ensure that all devices in
the system are properly
grounded.
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 23
Wall Plate Media Center Microphone Input Crestron QM-WMIC
Further Inquiries
If, after reviewing this Operations and Installation Guide for the wall
plates, you cannot locate specific information or have questions, please
take advantage of Crestron's award winning customer service team in
your area. Dial one of the following numbers.
• In the US and Canada, call Crestron's corporate headquarters at
1-888-CRESTRON [1-888-273-7876].
• In Europe, call Crestron International at +32-15-50-99-50.
• In Asia, call Crestron Asia at +852-2341-2016.
• In Latin America, call Crestron Latin America at
+5255-5093-2160.
• In Australia and New Zealand, call Crestron Control Solutions
at +61-2-9737-8203.
You can also log onto the online help section of the Crestron website
(www.crestron.com
users will need to establish a user account to fully benefit from all
available features.
) to ask questions about Crestron products. First-time
Future Updates
As Crestron improves functions, adds new features, and extends the
capabilities of the QM-WMIC, additional information may be made
available as manual updates. These updates are solely electronic and
serve as intermediary supplements prior to the release of a complete
technical documentation revision.
Check the Crestron website (www.crestron.com
update availability and its relevance. Updates are available from the
Downloads | Product Manuals section and are identified as an
“Addendum” in the Download column.
) periodically for manual
24 • Wall Plate Media Center Microphone Input: QM-WMIC Operations & Installation Guide - DOC. 6245
Crestron QM-WMIC Wall Plate Media Center Microphone Input
Return and Warranty Policies
Merchandise Returns / Repair Service
1. No merchandise may be returned for credit, exchange, or service without prior
authorization from CRESTRON. To obtain warranty service for CRESTRON products,
contact the factory and request an RMA (Return Merchandise Authorization) number.
Enclose a note specifying the nature of the problem, name and phone number of contact
person, RMA number, and return address.
2. Products may be returned for credit, exchange, or service with a CRESTRON Return
Merchandise Authorization (RMA) number. Authorized returns must be shipped freight
prepaid to CRESTRON, 6 Volvo Drive, Rockleigh, N.J., or its authorized subsidiaries,
with RMA number clearly marked on the outside of all cartons. Shipments arriving
freight collect or without an RMA number shall be subject to refusal. CRESTRON
reserves the right in its sole and absolute discretion to charge a 15% restocking fee, plus
shipping costs, on any products returned with an RMA.
3. Return freight charges following repair of items under warranty shall be paid by
CRESTRON, shipping by standard ground carrier. In the event repairs are found to be
non-warranty, return freight costs shall be paid by the purchaser.
CRESTRON Limited Warranty
CRESTRON ELECTRONICS, Inc. warrants its products to be free from manufacturing defects in
materials and workmanship under normal use for a period of three (3) years from the date of purchase
from CRESTRON, with the following exceptions: disk drives and any other moving or rotating
mechanical parts, pan/tilt heads and power supplies are covered for a period of one (1) year;
touchscreen display and overlay components are covered for 90 days; batteries and incandescent lamps
are not covered.
This warranty extends to products purchased directly from CRESTRON or an authorized CRESTRON
dealer. Purchasers should inquire of the dealer regarding the nature and extent of the dealer's warranty,
if any.
CRESTRON shall not be liable to honor the terms of this warranty if the product has been used in any
application other than that for which it was intended, or if it has been subjected to misuse, accidental
damage, modification, or improper installation procedures. Furthermore, this warranty does not cover
any product that has had the serial number altered, defaced, or removed.
This warranty shall be the sole and exclusive remedy to the original purchaser. In no event shall
CRESTRON be liable for incidental or consequential damages of any kind (property or economic
damages inclusive) arising from the sale or use of this equipment. CRESTRON is not liable for any
claim made by a third party or made by the purchaser for a third party.
CRESTRON shall, at its option, repair or replace any product found defective, without charge for parts
or labor. Repaired or replaced equipment and parts supplied under this warranty shall be covered only
by the unexpired portion of the warranty.
Except as expressly set forth in this warranty, CRESTRON makes no other warranties, expressed or
implied, nor authorizes any other party to offer any warranty, including any implied warranties of
merchantability or fitness for a particular purpose. Any implied warranties that may be imposed by law
are limited to the terms of this limited warranty. This warranty statement supercedes all previous
warranties.
Trademark Information
All brand names, product names, and trademarks are the sole property of their respective owners. Windows is a registered
trademark of Microsoft Corporation. Windows95/98/Me/XP and WindowsNT/2000 are trademarks of Microsoft Corporation.
Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 25
Wall Plate Media Center Microphone Input Crestron QM-WMIC
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Crestron QM-WMIC Wall Plate Media Center Microphone Input
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Operations & Installation Guide - DOC. 6245 Wall Plate Media Center Microphone Input: QM-WMIC • 27
Crestron Electronics, Inc. Operations & Installation Guide - DOC. 6245
15 Volvo Drive Rockleigh, NJ 07647 12.03
Tel: 888.CRESTRON
Fax: 201.767.7576 Specifications subject to
www.crestron.com change without notice.
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