Qt 100
Installation & Operations Guide
Qt 100
Safety Information
Qt 100 Introduction
Hardware Installation
Installing the Control Module
Wall Mount
Connections to the Front Panel
Connect Paging or Music
Contact Closure
Connecting Power
Installing Qt Emitters
Emitter Installation Order
Custom Cabling Guidelines
System Configuration via the Front Panel
System Information
Setting Sound Masking Level
Setting Audio Input Levels
Lock/Unlock the Front Panel
Error Codes
Post Installation Handoff
Settings Record
page 2
Safety Information
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water. Indoor use only.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance with
the manufacturer’s instructions.
8) Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers) that
produce heat.
9) Use only power supply provided with the unit.
10) Do not defeat the safety purpose of the polarized or groundingtype plug. A polarized plug has two blades with one wider than the
other. A grounding type plug has two blades and a third grounding
prong. The wide blade or the third prong is provided for your
safety. If the provided plug does not fit into your outlet, consult an
electrician for replacement of the obsolete outlet.
11) Protect the power cord from being walked on or pinched
particularly at plugs, convenience receptacles, and the point where
they exit from the apparatus.
12) Only use attachments/accessories specified by the manufacturer.
13) Unplug this apparatus during lightning storms or when unused for
long periods of time.
14) Refer all servicing to qualified service personnel. Servicing is
required when the apparatus has been damaged in any way, such
as power-supply cord or plug is damaged, liquid has been spilled
or objects have fallen into the apparatus, the apparatus has been
exposed to rain or moisture, does not operate normally, or has been
page 3
Qt 100 Introduction
This manual covers system installation, masking level setting and
system maintenance. This introduction section discusses guidelines to
ensure effective sound masking coverage.
The Qt 100 control module supports one zone of sound masking with
two cable runs. Each run supports up to 60 emitters. The maximum
coverage area for the Qt 100 is 12,000 square feet (1,115 m2). The
module features one audio input for distribution of audio from paging
controllers or background music players.
It is important that the masking volume be set correctly to achieve the
full effectiveness of the Qt 100 system. If volume levels are set too
low, speech privacy will be reduced and workplace distractions will
become more apparent. If volume levels are set too high, the masking
sound could become a source of distraction. The higher the setting
that can be used comfortably, the better the acoustic privacy.
For a given open office design, including ceiling height, ceiling
material and workstation panel height, we can define the masking
volume required to achieve “normal acoustic privacy,” (i.e., normal
voices are unintelligible yet audible). In an open office environment,
the target background sound level is in the 45–48 dBA range, as
measured 3 feet (0.9 m) above floor level.
Similarly, for private offices, based on wall panel design and ceiling
construction, we can define masking volumes required to achieve
“confidential privacy,” (i.e., normal voices not audible). Most private
offices have a target background sound level in the 38–42 dBA range.
Setting the masking volumes can be approached in one of three ways:
Best: The Qt 100 has a companion iPad app that takes acoustic
measurements and relays the results to the control module via
Bluetooth to set the appropriate masking sound level. See Qt 100
Configuration App Manual.
Good: If a sound level meter is available, it is recommended that the
control module’s masking volume be adjusted up or down to achieve
the following readings on the meter:
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Sound Level Meter Readings
Private Office Zones
38-42 dBA, averaged spatially within the office
Open Area Zones
45-48 dBA, measured 3 feet (0.9 m) above floor level
OTHERWISE: If a sound level meter is not available, the
recommended levels are likely to be achieved in most environments
by setting the control module’s masking volumes as follows:
Control Module’s Masking Volume Settings
Private Office Zones
05-09, for all ceiling heights
Open Area Zones
13-16, for 08 ft. (2.4 m) ceilings
15-18, for 10 ft. (3 m) ceilings
17-20, for 12 ft. (3.7 m) ceilings
Masking volumes must be set sufficiently high to improve speech
privacy and reduce distraction but not so high that the masking
sound becomes obtrusive. Settings within the above ranges typically
accommodate both objectives. As a general rule, use the high end
of the range. Base final settings on site conditions and customer
page 5
Hardware Installation
Installing the Control Module
NOTE: Always plug/unplug power supply at wall outlet
Wall Mount (attached to the back of the control module)
Remove the wall mount from the control module. Mount the wall
mount using the 4 screws and plastic anchors provided. Use a ¼ inch
drill bit for the anchor hole. The included Plastic anchors are #6 x 1”
with #6 x 1 ¼” screws.
Use the bubble level on the wall mount to guide installation. Make
sure to completely tighten the screws to ensure proper mounting of
the front panel.
All connections are made to the control module and then the module
“snaps” into place on the wall mount.
page 6
Connections to the Front Panel
Connect Paging or Music
NOTE: The fixed terminal block can be removed for ease of
Balanced Audio Input: (Most often, but not always
characteristic of paging systems.)
Connect signal wires to + and - at the input.
Connect the shield to GND at the audio source.
Unbalanced Audio Input: (Typical of music systems.)
a. Mono Signals: Connect the mono signal wire
to both L and R (split the wire) on the block.
Connect the ground wire to GND.
b. Stereo Signals: Connect the respective signal
wires to L and R on the block. Connect the
ground wire to GND.
Contact Closure
The Qt 100 provides an instant shut-off capability for masking if
connected to a contact closure interface. The contact closure utilizes
the same connector as the audio input. To leverage this feature,
connect a
page 7
two-conductor cable to the two connectors, labeled “contact”.
The other end of these conductors (treated as pairs/circuits) can be
terminated on closure mechanisms of choice.
1. To shut off masking, form a connection between the
two conductors.
2. To resume masking, break the connection.
Connecting Power
The controller comes standard with
a 24 V wall plug power supply. This
supply features a wall plug and a
fixed barrel connector.
Alternatively, power can be
supplied to the fixed block
connector, which allows for stripped
and tinned wires for added
flexibility and convenience.
The terminal block can be removed
for easy wiring. Simply connect
the positive and negative wires to
the terminal block and slide the
terminal block back onto the posts.
page 8
Installing Qt Emitters
Important Considerations:
▪ Each run has a maximum of 60 emitters!
▪ Each run supports a maximum cable length of 1000 ft.
▪ Each home run cable attached to the control module should be
labeled by Zone # and Run #. Adding a logical name (e.g. Marketing, Private Offices) is suggested. In addition, fill out “Zone
Destination Record” at the end of this Guide.
▪ The module has two identical outputs, Run 1 and Run 2. All
emitters on Run 1 and Run 2 are controlled equally.
▪ Each job-made cable should be manufactured according to
ANSI/TIA/EIA Standard 568-B. See custom cabling guidelines
on page 10.
▪ Job-made cables should be tested with a LAN cable tester
before installation.
Emitter Installation Order
1. Set the masking output level to the maximum level of 30.
2. Refer to the emitter layout and wiring diagram provided by the
dealer for cable run connections.
3. Run home run cables from control module to the location of the
first emitter for all runs.
4. Gather all ceiling tiles (per layout drawing) that are to receive
emitters. Use the supplied hole saw to cut holes in designated
tiles. Cut all tiles from the front. (Different types of emitter housings are available to attach in areas where there are no suspended ceiling tiles.)
5. Push the emitter through the front of the hole in tile and secure
it by pushing down and twisting the locking ring at the back of
the emitter.
1. The “tombstone” hook on the back of each emitter is next to
the INPUT jack. This can help you find the INPUT jack by touch.
2. To adjust for unexpected obstacles such as sprinkler heads, each
emitter may be moved up to two feet (one tile or 0.6 m) in any
direction, if necessary.
page 9
6. Connect a run cable from the specified OUTPUT jack on the
module to the INPUT jack of the first emitter. Listen to each
emitter as it is connected. If you cannot hear its “whooshing”
a. Try a different emitter.
b. Test all four previous cables for continuity and shorts.
Repair any faulty cables.
c. If a short is detected, the masking will shut off until the
short is physically fixed. The error on the control module
will remain until the error is cleared.
(see Clearing Error Codes, page 13)
DO NOT put the input cable into the output port of the emitter.
If sound is only heard by putting the cable in the output, there is
a problem earlier in the cable run.
Be sure to fix any problems and hear the “whooshing” sound
before installing the next emitter.
7. Connect the next OUTPUT cable to the emitter OUTPUT jack.
8. Run the cable to next designated tile specified on emitter layout
and wiring diagram. Tie cables up to structure or suspend from
deck as required by local building code.
9. On the next emitter, connect this cable to the INPUT jack.
10. Repeat Steps 4 through 9 for the remaining emitters on the
home run.
11. Set sound masking volume levels for each zone, using either the
front panel controls or the software interface. Set sound levels
according to Table 1.
1. The “tombstone” hook on the back of each emitter
is next to the INPUT jack. This can help you find the
INPUT jack by touch.
2. To adjust for unexpected obstacles such as sprinkler
heads, each emitter may be moved up to two feet
(one tile or 0.6 m) in any direction, if necessary.
page 10
Custom Cabling Guidelines
For system compliance, follow these guidelines if custom cables are
1. Use solid conductor 24 AWG CAT cable that meets local code
2. If the system is installed in a return air plenum, the cable must
be plenum rated.
3. Shielding is not required. Unshielded twisted pair (UTP) cable is
4. Snagless boots are not required.
5. RJ-45 plugs must use the “bent 3-tine” RJ 45 plugs intended for
use with solid core CAT wire. Three tine plugs can be purchased
at a hardware store and from most CAT cable suppliers. DO
NOT USE the “aligned two-tine” type intended for stranded
wire, as they provide improper contact and may yield intermittent system operation. The diagram below shows the cross
section view of both types.
6. Field test each cable after fabrication with the RJ-45 connectors
(before final installation), using a standard network LAN cable
tester, to check for continuity, shorts, and 1:1 (straight through)
RJ-45 connector
with bent type
RJ-45 connector
with aligned type
page 11
System Configuration via the
Front Panel
After the Qt 100 is mounted and the emitters have been tested, it is
time to configure the Qt 100 for general operation.
The front panel display shows system information and allows for
adjustment of the masking and the auxiliary audio input levels.
System Information
Initial display of the front panel, shown below, shows the software
version and system status.
The VERSION X.X.X indicates the following fields: major release.
minor changes . bug fixes The BRx format is to identify the version of
the internal code and used as reference for technical support on rare
occasions. Status indicates if there are errors (see Error Format) or if
the system is OK.
Status: OK HxBx
The Cambridge Sound Management support phone number is on the
display as the default service contact.
For Service Call
page 12
Setting Sound Masking Level
Z1 Volume: Mute
This figure shows that the format of the panel for configuring masking. Z1 stands
for zone 1 and it is currently set to mute.
The initial value of Mute is displayed. To adjust the level, use the up
and down arrows while this screen is displayed.
Settings within the recommended ranges (see page 4) should
optimize speech privacy without excessive distractions. Generally,
set masking volumes toward the high end of the recommended
range and adjust according to site conditions and user preferences. If
possible, measure the results with a sound level meter and check for
the achieved sound pressure level. Adjust as necessary or judge by
listening in the area.
Setting Audio Input Levels
Input A
Z1 Volume: 6
This figure shows the format of the panel for configuring the volume for input A.
The example shows Input A is level 6.
The system has one input for paging or music. If no paging and/or
music from the input is desired, set the audio volume level to mute.
The audio input levels are set in a similar way as the masking. Use
the arrows on the front panel to move left and right to find the input
A field. The input is enabled and level set using the up and down
Lock/Unlock the Front Panel
If the configuration app was used to set the masking level, the app
could have locked the front panel. To unlock the front panel, hold
the left and right buttons for 5 seconds. The front panel display will
indicate that the panel has been unlocked. To lock the front panel,
repeat the process, hold the left and right buttons for 5 seconds. If
using the configuration app, the front panel will automatically unlock
when adjusting the masking level.
page 13
Error Codes and Clear Error
System errors are shown on the control module front panel display.
If an error occurs, the message “Status: Error” will be displayed. To
determine the cause of the error, press NEXT (right arrow button), to
display the error code.
Error Codes
If one or more errors exist in the sound masking system, an eight
digit error code is displayed on the LCD display (scroll forward to the
“Error” screen). The error state is indicated by an eight digit code of
the form:
Error: 0_000000
Error Code for Zone 1
Error Code for Control Module
Where a number other than “0” indicates an error.
Error: 0_000001
Short sensed in the wiring of the zone
Error: 0_000004
Emitter not working
Error: 2_000000
Over temperature
Error: 4_000000
Intermittent fault
Error: 8_000000
Contact the manufacturer
Clearing Error Codes
To clear an error that is currently shown on the display:
1. Press the right arrow button on the front panel to see the error
2. Press the up arrow to clear the error code
3. If the error still persists, the problem has not been resolved
4. If you are not sure how to resolve the problem,
contact support@cambridgesound.com
page 14
Post Installation Handoff
Perform a final walk through to satisfy all aspects of the system performance:
1. Fill out the settings record.
2. Store guide with completed settings record near the control
module. If there is a hard module failure, the recorded values
can be used to reconfigure the system. System settings are
retained after a power outage.
3. Lock the control module panel by holding down the left and
right buttons for 5 seconds.
If you need assistance installing or commissioning this Qt 100 sound
masking system, please contact CSM support at:
1.800.219.8199 (Toll free within US & Canada)
617.349.3779 (Outside US & Canada)
page 15
Note: This equipment has been tested and found to comply with
the limits for a Class A digital device, pursuant to part 15 of the FCC
Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to
radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will
be required to correct the interference at his own expense.
Modifications not expressly approved by the manufacturer could void
the user’s authority to operated the equipment under FCC rules.
Warranty Coverage — Qt® Emitters
Cambridge Sound Management, LLC (the “warrantor”) will, for a period of five (5) years, starting with the date of purchase, warrant that
the Qt Emitters™ (the “speakers”) will be free of defects in materials
and workmanship that interfere with proper operation as a sound
masking, paging and music speaker system. During that period, the
warrantor will, at its option, either (a) repair the speaker, or (b) replace
the speaker. The decision to repair or replace will be made by the
Warranty Coverage — Qt control unit
The warrantor will, for a period of five (5) years, starting with the date
of purchase, warrant that the Qt control unit (the “system”) will be
free of defects in materials and workmanship that interfere with its
proper operation as a sound masking, paging and music distribution
control system. During that period, the warrantor will, at its option, either (a) repair the system, with new or refurbished parts, or (b) replace
the system with a new or refurbished system of equal functionality
at no charge. The decision to repair or replace will be made by the
All software installed in the Qt system is warranted to substantially
conform to its published specifications. In no event does the warrantor warrant that the software is error free or that the customer will be
able to operate the software without problems or interruptions. The
warrantor will, from time to time, make available software bug fixes.
It is the responsibility of the purchaser to download and install these
software modifications. Except for the forgoing, all software and software upgrades are provided AS IS.
page 16
The following terms apply to all
These warranty terms are extended only to the original purchaser of a
new product. A purchase order or other proof of the original purchase date and purchaser is required for warranty service.
Obtaining warranty repairs: Please access and review online help
resources for the product before requesting warranty service. If the
product is still not functioning properly after making use of these resources, please contact Cambridge Sound Management for a return
authorization number. All returns are to be prepaid. The warrantor
will pay return surface freight within the continental United States on
warranty repairs. All customs and freight charges in excess of surface
freight within the United States will be born by the purchaser.
Warranty Limits and Exclusions
This warranty ONLY COVERS failures due to defects in materials
or workmanship, and DOES NOT COVER normal wear and tear or
NOT COVER damages that occurred in shipment, failures that are
caused by products not supplied by the warrantor (e.g., replacement power supplies) or failures that result from accidents, misuse,
abuse, neglect, mishandling, misapplication, alteration of any sort,
installation, use as a system driver during speaker installation, set-up
adjustments, misadjustment of controls, improper maintenance, power line surge, lightning damage, power surges, modification, rental
use, service by anyone other than the warrantor or damage that is
attributable to acts of God. THERE ARE NO EXPRESS OR IMPLIED
PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WARRANTY. As an example, this specifically excludes damages for lost time,
lost use of the system, cost of removal or reinstallation of the system
or travel to and from the purchaser’ location. ALL EXPRESS AND
IMPLIED WARRANTIES ARE LIMITED TO THE PERIOD OF THE WARRANTY. This warranty provides specific legal rights, and there may be
others that vary from state to state or in the country of compliant use.
Therefore, certain additional exclusions may apply.
page 17
Zone Destination Record
Zone 1
Run 1 ____________
Run 2 ____________
Settings Record
Zone: 1
Input A:
Installation / Service:
Company name:_______________________________________
Install date:
©2015 Cambridge Sound Management, Inc. All rights reserved. Qt is a registered trademark
and QtPro is a trademark of Cambridge Sound Management, Inc.
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