Qt® Conference Room Edition
A Speech Protection System Designed for Conference Rooms
Installation and Operations Guide
Table of Contents
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Using Sound Masking to Protect Privacy of Conference Rooms . . . . . . . . . . . . . . . . . . 7
Full Feature List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Planning the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Sound Masking Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Choosing Where to Install Emitters – What is an exposed wall? . . . . . . . . . . . . . . . . . . 9
Emitter spacing and ceiling height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Emitter Layout – Normal installation – Two Rows of Emitters . . . . . . . . . . . . . . . . . . . 10
Emitter Layout – When to Use Up to 4 Rows of Emitters . . . . . . . . . . . . . . . . . . . . . 11
Controller and Privacy Sign Layout . . . . . . . . . . . . . . . . . . . . . . . . 12
Options on How to Control the System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
Pre-wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Connection to Privacy Signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Installing Qt Emitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Important Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Custom Cabling Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Important Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Installing the controller and privacy signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Controller Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Installing the Controller to the Back Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Mounting Options for the Privacy Signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3
System Conguration Via the Front Panel . . . . . . . . . . . . . . . . . . . . 25
System Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
User Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Set-up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Commissioning Ramp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Contact Closure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Paging / Music Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
System Acoustic Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Special Installation Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Error Codes and Clear Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Post-Installation Hando . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Zone Destination Record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Settings Record. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Hole Cut Guide for Flush Mount Box . . . . . . . . . . . . . . . . . . . . . . . 37
Hole Cut Guide for Privacy Sign . . . . . . . . . . . . . . . . . . . . . . . . . .39
Addendum. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
4
Safety
Important Safety Instructions:
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
ampliers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type 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 t into your outlet, consult
an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles,
and the point where they exit from the apparatus.
11. Only use attachments/accessories specied by the manufacturer.
12. Unplg this apparatus during lightning storms or when unused for long periods of time.
13. Refer all servicing to qualied service personnel. Servicing is required when:
• the apparatus has been damaged in any way
• liquid has been spilled or objects have fallen into the apparatus
• the apparatus has been exposed to rain or moisture
• the apparatusdoes not operate normally, or has been dropped
5
Packing List
The package includes:
• 1 Wall-mounted ST 1000 control module
• 1 4-gang adaptor plate for control module (used for 3-gang EU/UK boxes)
• 2 Automatically lighted privacy signs
• 2 1-gang adaptor plate for privacy signs
• 1 Power supply
• 8 Qt Emitters
• 7 16 ft audio cables
• 1 50 ft CAT-3 audio cable (home run)
• 2 50 ft two-conductor cables for privacy signs
• 1 Hole saw
• 4 Privacy sign 6/32” x 3/8” screws
• 8 Wall plate adapter 6/32” x 3/8” screws
• 4 Control module back panel 6/32” x 5/8” screws
6
Introduction
General
The Quiet Technology Conference Room Edition (QtCRE) from Cambridge Sound Management is a very costeective solution to provide condential speech privacy for conference rooms, executive oces and suites,
boardrooms, and other sensitive spaces, to the immediate areas surrounding such spaces. For convenience
we may refer to all such rooms as conference rooms although that may not be their actual use. The system
comprises sound masking emitters and a lighted privacy sign placed immediately outside the private
conference room indicating when the system is operational, and a QtCRE controller and identical privacy sign
inside the room. The system does not place sound masking emitters inside the sensitive space itself.
Using Sound Masking to Protect Privacy of Conference Rooms
The acoustical attenuation performance of walls and other construction surrounding conference rooms can
vary widely. Even if high quality materials with high STC (sound transmission class) ratings are installed with
the intent of providing adequate sound attenuation, the expected result may not be achieved if the surrounding
space is suciently quiet. There may be sound leaks under doors or an HVAC that serves as a “sound tubes”
to adjacent spaces. Acoustical ceilings may be intended to provide good sound absorption but these same
lightweight tiles usually allow substantial speech sound to transmit through them to plenums above and back
down to oces adjacent the conference room. Return air grilles into plenums common to both the conference
room and exterior spaces are a frequent privacy issue. Background noise from a high quality building HVAC
system may be so low that it provides no signicant masking of speech sound escaping the conference room.
The common use of modern energy-ecient variable air volume HVAC systems can further exacerbate this
problem. Remedial work to the construction or HVAC system to improve privacy can be very costly, and even
then may not achieve satisfactory results. On the other hand a dedicated electronic sound masking system
around the conference room is cost eective and will provide condential privacy in almost all applications.
A conference room speech privacy protection system diers from typical oce-wide sound masking system in
three important ways:
1. The sound masking is applied only to a select small area – the exposed area around the perimeter of the
conference room.
2. Rather than operating 24/7 the QtCRE sound masking optionally may be turned on and o by users.
3. The resulting speech privacy protection status is indicated in the conference room and the entrance to it by
lighted signs.
The QtCRE sound masking levels can be calibrated using Cambridge Sound Management’s Qt100
Conguration iPad app, iMic microphone, and Bluetooth dongle (used to connect the iPad to the QtCRE unit)
or by a calibrated sound level meter with octave band lter set or analyzer. If using iPad app, set levels directly
below rst row of emitters.
Alternatively, levels may be set using the standard settings chart later in the manual, which will work ne for
most installations.
7
The QtCRE control module supports one zone of sound masking with 2 cable home runs. Each run supports
up to 60 emitters. The maximum coverage area for the QtCRE is 12,000 sq. ft. (1,115 m²) although typical
conference room speech privacy installations will not require coverage for such a large area.
Full Feature List
• Comes standard with: two automatically-lighted privacy signs with cables; one wall-mounted control module
(controller) and power supply; mounting brackets; eight emitters; seven 16-ft. (4.8m) audio cables; one 50ft. (15.2m) CAT distribution line (for the home run cable); and a hole saw
• Sound masking level adjustable in 1/2 dB steps
• Out of the box support for conference rooms with up to 40 ft. (12m) of exposed walls
• Optional add-on emitters for larger areas
• Simplied software for easy customer operation
• More advanced functions accessible by installer
• Premium, minimalist design style to t in with other conference room AV equipment
• Smooth ramp up and down sound masking level function to inhibit disruption outside the conference room
• Controllable from in-room Crestron and AMX control systems via contact closure; also oers 5V trigger
output
• Straightforward, low-impact installation
• Can be left on 24/7 or turned on as needed during condential meetings
• Less than 7 watts power consumption
• Power supply compatible with 100VAC to 240VAC power mains
8
Planning the System
Sound Masking Guidelines
This manual covers system installation of the controller, privacy signs and emitters, as well as masking level
setting and system maintenance. This introduction section discusses guidelines to ensure eective sound
masking coverage.
Generally the layout and calibration of emitters outside a conference room follow the standards for an open
oce design. It is important that the masking volume be set correctly to achieve the full eectiveness of the
system. If volume levels are set too low, speech privacy for the conference room occupants will be reduced
and people outside the conference room may nd audio leakage to be more distracting. If volume levels are
set too high, the masking sound itself could become a source of distraction.
In a given open oce design, including ceiling height, ceiling material, and workstation panel height, we can
dene the masking volume required to achieve “normal acoustic privacy,” between oces (i.e., normal voices
are audible but not easily understood). In an open oce environment, the target background sound level is
typically in the 45 - 48 dBA range, as measured 3 - 4 ft. (0.9 m) above oor level.
Ceiling Height Volume Level Intended Result (at listener ear level)
8 ft. (2.4m) 13 - 16 45 - 48 dBA
10 ft. (3m) 15 - 18 45 - 48 dBA
12 ft. (3.6m) 16 - 19 45 - 48 dBA
Choosing Where to Install Emitters – What is an exposed wall?
The goal of the system is to lower the listener’s speech-to-masking noise ratio to the point that people outside
cannot understand any speech originating in the conference room, even from persons using a raised voice.
Technically this is known as Condential Privacy or having an Articulation Index (AI) of 0.05 or below, and is
comparable to a Speech Transmission Index (STI) of 0.12 or below.
In order to achieve this goal, the emitters should be installed in rows parallel to all exposed walls of the
conference room, that is, along any wall party (common) to both the conference room and any adjacent oce
spaces, including open plan or private enclosed oces, corridors, storage or utility rooms, etc.
Emitter spacing and ceiling height
Spacing between emitters generally should follow the same rules as for other Cambridge Sound Management
(CSM) direct eld masking systems, i.e. should be not less than the ceiling height above the nished oor. The
English dimensions are based on America drop ceiling tile sizes (24x24”, 24x48”). The metric dimensions are
based on international tile sizes (300x300mm).
Ceiling Height Spacing
Ceiling heights less than 10 ft. (2.4m) 8 ft. spacing (2.4m)
Ceiling height is 10 ft. to 12 ft. (3m) 10 ft. spacing (3m)
Ceiling height is 12 ft. and above (3.6m) 12 ft. spacing (3.6m)
9
Emitter Layout – Normal installation – Two Rows of Emitters
Place the rst row adjacent any party wall between the conference room and exterior spaces at 1/2 the height
of the ceiling or less. For example, a 10 ft. (3m) ceiling, place the rst row no more than 4 or 5 ft. (1.2 to 1.5m)
from the wall. Continue both rows one spacing beyond both ends of party walls. However, for party walls that
are adjacent a narrow corridor or room, one row on or near the center is sucient.
Example: Conference room with one exposed wall – two rows of emitters.
Example: Conference room with two exposed walls and an open area extending away from the area in one
direction. One row of emitters in side cubicle area.
10
Emitter Layout – When to Use Up to 4 Rows of Emitters
Consider using 4 rather than 2 rows of emitters in the conditions described below. Four rows may not
be required if no speech is intelligible beyond the rst two rows. To test for this have a colleague go into
the conference room, close all doors, and read some material with raised voice as though addressing a
conference. Listen in the area beyond the rst two rows of emitters while the masking system is operating at
its set level. The test should be done after all room nishes and furniture are in place and when there are no
atypical noise sources operating near the masking coverage area. The test should be done when the oce
is unoccupied so that activity noise is absent. If the speech is not intelligible under these conditions, then two
rows are sucient.
Reasons to use 4 rows of emitters:
• Conference rooms with speech reinforcement or other amplied sound such as computer playback of
speech
• No plenum barrier above the conference room party wall
• Open ceiling shared by conference room and protected areas
• Glass or demountable partition party walls
• Unusually quiet exterior spaces (less than 38 dBA ambient)
• Highly sound reective (reverberant) spaces
Example: Installation with 3 rows of emitters.
11
Controller and Privacy Sign Layout
Options on How to Control the System
It is important to understand how the system will be used and controlled to decide the location of the controller
and privacy signs.
The controller unit is self-contained and can be operated by the end-user directly from the front panel. The setup features are hidden from the end user to prevent accidental changes.
The signs indicate that the system is fully on only when lit steadily. They blink while ramping up or down
(the gentle increase or decrease of sound level).
Optionally the system can also be controlled via contact closure (such as by an automation control system).
In this case the controller should be placed out of the way, such as in a closet or IT closet, to reduce any
confusion about the active control point. The system also features a nominal 5V trigger out for status
conrmation to a control system.
An external contact closure can also be used to allow control from a remote switch such as a light switch or
single-pole, single-throw (SPST) low voltage switch.
In an operating scenario in which contact closure is used, emergency cuto can only be achieved if the low
level is MUTE and CC ramp down time is 0.
Optionally the system may be installed similar to standard sound masking (which is normally on 24/7),
with the controller visible or hidden.
Placing the controller:
• In a place easy to reach for occupants of the room, such as near light switches near the room entrance, or
at a convenient place accessible during presentations.
• Can be visible or hidden, but remember people may not know how or where to operate it if it is completely
out of sight.
Placing the privacy signs:
• Two privacy signs are provided, one for the room occupants and the other for people outside the room.
Typically one sign is mounted inside the conference room to alert the occupants to status and the other is
mounted outside conference room, adjacent to the main door.
• Use of both signs is not required or both may be installed inside or outside the room. Coordinate with
Owner.
12
Installation
Pre-wiring
Home Run
The 50’ CAT distribution line supplied with the base kit should be sucient as the home
run for almost all installations. It may be replaced by a longer CAT cable to the rst emitter
without excessive loss or impact privacy signal level dierence between the rst and last
emitters on the line. Theoretically a CAT coupler and additional cable could be used rather
than a longer home run but this is not the preferred method due to the coupler most likely
being located in an inaccessible and/or undocumented location, possibly complicating
future servicing.
Emitter Cable (Interconnects) Conguration
The interconnects should be connected the same as in a conventional CSM Qt masking
system, i.e. in a series serpentine layout. This will assure that adjacent emitters are on
dierent channels to minimize any phase interference issues.
CSM’s Quiet Technology uses four distinct non-correlated sounds that repeat every fourth emitter
automatically. The home run from the controller to the rst emitter may be concealed in a wall stud space.
Four Channel
Distribution
How CSM Emitter Cabling Works – Homeruns and Daisy Chaining
Emitters on each line are daisy-chained in series during installation. Each emitter has passive internal logic
which rolls over its input channel to a dierent channel at its output port. Thus every fourth emitter is actually
operated in parallel with the rst.
13
Power Supply
In most cases the 24V power supply will need to be located remotely, with a cable run from the power supply to
the controller. In some cases a wall plate such as the Vanco 120614X permits in-wall running of the power wire
to an AC plug on the exterior of the wall.
The power supply wire may be extended using appropriate cable and connectors. The cable should be UL
rated and plenum rated if routed through any plenum space.
Audio Input
Optionally the QtCRE includes an audio input usable for music or paging. The input is fully functional
regardless of front panel or contact closure control. Therefore, the system may be used for music or paging
even when masking is muted or o.
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.
• Mono Signals: Connect the mono signal wire to both L and R (split the wire) on the
block. Connect the ground wire to GND.
• Stereo Signals: Connect the respective signal wires to L and R on the block.
Connect the ground wire to GND.
Contact Closure Input
This terminal can be used either for remote triggering by a Crestron, AMX, or other control system. In either
case, the contract closure takes priority over the front panel control settings. Contact closure ramp speed can
be set separately from front panel control ramp speed.
Trigger Output
The trigger output provides nominally 5VDC when the system is operating at Normal level, for use in triggering
other devices or to provide an acknowledgment signal back to an external automation system like a Crestron.
Note that upon initiation of a downward ramp event, deactivation of the trigger signal will lag the completion
of the downward ramp by several seconds in addition to the ramp down time parameter congured on the
ST1000 control module. During a ramp-up to Normal operating level event, the full and consistent activation of
the trigger voltage may not be complete until the Normal operating level is reached. Control system programs
should be written to anticipate and accommodate this behavior.
14
Connection to Privacy Signs
Run a separate cable from the controller mounting location to each lighting location. Do not daisy chain signs
as this may cause the lights to be of dierent brightness. Two 50-ft. (15.2m) plenum rated cables are provided
with the kit.
NOTE: Wiring nomenclature is
located under the removable
Sign 1 +
GND -
Sign 2 +
GND -
Control +
GND -
Note that the small switch on the side of the controller must be set to the “up” position (closer to the top of the
case) for the lights to work. The “down” setting enables the external USB jack, used for rmware updates or for
the optional Bluetooth dongle supplied with the Qt100 iPad app.
terminal block connector.
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15
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 Oces) is suggested. In addition, ll out the “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 18.
• Before installation, job-made cables should be tested with a LAN cable tester.
Installation
1. Set the masking output level to the maximum level of 30. (Set sound masking volume levels using either of
the front panel controls.)
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 rst 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. (Dierent 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.
NOTE:
• The “tombstone” hook on the back of each emitter is next to the INPUT jack.
• This can help you nd the INPUT jack by touch.
• To adjust for unexpected obstacles such as sprinkler heads, each emitter may be moved up
to 2 ft. (one tile or 0.6 m) in any direction.
16
6. Connect a run cable from the specied OUTPUT jack on the module to the INPUT jack of the rst emitter.
Listen to each emitter as it is connected. If you cannot hear its “whooshing” sound:
• Try a dierent emitter.
• Test all four previous cables for continuity and shorts. Repair any faulty cables.
• If a short is detected, the masking will shut o until the short is physically xed. The error on the control module will
remain until the error is cleared. (see Error Codes and Clearing Errors, page 31) Set the masking output level to the
maximum level of 30.
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 x any problems and hear
!
the “whooshing” sound before installing the next emitter.
NOTE:
• The input jack of each emitter bears this symbol and is located near the safety tie o.
• The output jack of each emitter bears this symbol.
7. Connect the next OUTPUT cable to the emitter OUTPUT jack.
8. Run the cable to next designated tile specied 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.
17
Custom Cabling Guidelines
Important Considerations
1. Use solid conductor 24 AWG CAT-13 cable that meets local code requirements.
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 acceptable.
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 nal installation), using a standard
network LAN cable tester, to check for continuity, shorts, and 1:1 (straight through) connection.
CORRECT
RJ-45 Connector with bent type
INCORRECT
RJ-45 Connector with aligned type
Installing the controller and privacy signs
Installation of the controller requires separating the front panel from the rear of the case – simply done by
pulling one from the other. All installation options require attaching the case rear rst, then getting cables
attached to the controller, then snapping the controller into place.
Controller Mounting Options
• Best practices: If installing the controller on a wall known to have sound transmission issues into an
adjacent space, it is recommended to use surface mounting. Be careful to seal airtight any cabling holes to
minimize sound transmission. Avoid back-to-back mounting of electrical or other wall components within a
single stud space.
• Best practices: On walls separating the conference room from an area with masking, don’t use gang
boxes with big holes as these are prone to passing sound. Whenever feasible, don’t install the box on a
wall requiring masking protection as it may exacerbate sound transmission problems.
18
The controller may be mounted in one of several ways:
• Flush Mount with Box
• Surface Mount on Box
• Surface Mount on Box
Flush Mount with Supplied Box
Cut hole in wall to dimensions x by x (use template) and run cables to this hole. After the cables have been run
to the hole in the wall, place the ush mount box in the wall (make sure up is actually up) and snap the four
clips that clamp to the back side of the drywall surface. Then attach the case rear to the wall adapter. During
installation it may be convenient to attach the wires to the tie-o point in the back of the box to prevent the
wires from falling back into the wall.
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19
Surface Mount on a Suitable 4-gang Electrical Box (3-gang Using EU/UK Hardware)
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4-gang electrical box (pre-installed or retrotted) – after the cables have been run to the box, use four supplied
screws to attach the wall plate adapter. (In the case of EU 3-gang boxes, use M3 or M3.5 screws as needed –
these are not included.) Then attach the system back to the wall adapter.
NOTE: The wall plate adaptor is ABS plastic and may be painted to match wall color. Use a standard
spray primer (Krylon) before painting.
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20
Surface Mount Directly to the Wall
Surface or panel mount of back plate – either with cables through hole (if cables can be run through the wall)
or out the side to end up on the surface of the wall or mounting point. Mark holes with template, open up larger
holes for cables if desired, run cables, attach back plate.
The wires may be run out the back of the case rear, or to the sides using the available openings. Consult a
knowledgeable person about the best type of hardware to attach to your wall surface.
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Installing the Controller to the Back Plate
After all cables have been attached, snap the controller in place.
After installation, the controller can be removed by pulling it, and it will snap away from its back, exposing the
cabling and also giving access to the mounting points.
21
Mounting Options for the Privacy Signs
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There are several options for mounting the privacy signs. These options allow for mounting on a variety of wall
surfaces, including glass.
1-gang Box (North American NEMA or UK/EU Types)
If using a 1-gang box, retrot or pre-installed, rst run cable to the box. Then mount the plate. Then attach the
cable. Then slide the sign down on the plate to secure it.
To remove, slide the light panel up and o the metal bracket.
22
Surface Mount (Double-Sided Tape), with Cabling Running Through Wall or on Surface of Wall
If running a cable through the wall, get this into position rst. Note that the exit point for the cable on the back
of the sign is centered across the bottom.
Connect the cable using the push terminals. Peel the double sided tape and attach the panel.
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REMEMBER TO CHECK ALL CONNECTIONS AND CONFIRM PRIVACY SIGN OPERATION BEFORE
ATTACHING TO WALL.
!
23
Mounting on Glass Plus Using “Hider” Plate for Other Side of Glass Surface
Best practices: it’s best to use self-adhesive tape, NOT a 1-gang box (because of sound transmission issues).
If mounting the signs to either side of the same wall, don’t locate the boxes closer than 2 ft. from each other.
The self-adhesive pads are very strong - take care in placing as moving after placement may be dicult. Also
note, special care may be required if mounting to glass with an adhesive lm coating.
NOTE: The hider plate is ABS plastic and may be painted to a desired color if needed. Use a standard
!
spray primer (Krylon) before painting.
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24
System Conguration Via the Front Panel
After the Qt CRE is mounted and the emitters have been tested, it is time to congure the Qt CRE for general
operation. The front panel display shows system information and allows for adjustment of the masking and the
auxiliary audio input levels.
The Qt CRE controller has two operating modes:
• User Mode – Simple controls, no adjustment or set-up access.
• Set-up Mode – Installer set-up adjustments. Accessible only by special key press (holding down the OFF
and ON buttons for 5 seconds).
System Information
Initial display of the front panel, shown below, shows the software version and system status.
This display is followed with this:
The system always boots up into User Mode, and will always return to the last used setting on power up
(on/o/low/high).
25
User Mode
User Mode gives minimal functionality and simple intuitive display read-outs. It has the following options:
• NORMAL Correct level for speech privacy in the conference room
• LOW Optional lower level masking
NOTE: does not give full privacy
• ON Turns system on to last used level (normal or low)
• OFF Mutes masking
In all cases the level ramps to the new level over an installer settable time span (“ramp time” in seconds).
While ramping the displayed characters and the panel lights blink. After ramp, masking is played at NORMAL
or LOW level based on what was set during installation.
NOTE: If during set-up the installer has turned on “Disable User Control,” then the buttons will
be locked – the sound masking will be on and will not be adjustable. The display will show the
following:
Please contact the system administrator to unlock the system, if needed.
Set-up Mode
Changing from User Mode to Set-Up Mode: Hold down the ON and OFF buttons (left and right) for 5 seconds,
then the display will blink three times (500 ms on / 500 ms o, etc.)
In Set-up Mode information and settings can be accessed by pushing the right (ON) and left (OFF)
buttons. Settings can be adjusted by pushing the top (NORMAL) and bottom (LOW) buttons. Each press of the
ON button while in Set-up Mode advances the display to the next item. Continue to press ON to loop back to
the start of the list.
26
Setting Default Value Options
General Info
Normal Masking Level 18 range up to 30
Low Masking Level 8 rangle up to current Normal Masking Level
setting
Input a Level 15 range up to 30
Ramp Up Speed (seconds) 30 seconds range 0 to 120 seconds
Ramp Down Speed (seconds) 5 seconds range 0 to 120 seconds
Contact Closure Ramp Up Speed (seconds) 30 seconds range 0 to 120 seconds
Contact Closure Ramp Down Speed (seconds) 0 seconds range 0 to 120 seconds
Disable User Control OFF OFF or ON -- enables/disables front panel
controls -- if Default value is ON, then sound
masking runs all the time.
Exiting Set-Up mode to return to User Mode: Hold down the ON and OFF buttons (left and right) for 5
seconds, then the display will blink three times and display the following:
Commissioning Ramp
With traditional sound masking systems, a commission process is used that ramps up the sound masking over
several weeks’ time. In the case of the Qt CRE system, because sound masking is user-initiated at the time of
using the conference room, no commissioning ramp is used.
Contact Closure
Contact closure may be used for remote control by an automation system, or purely as a trigger for ducking an
emergency notication.
Contact closure, when triggered (contacts closed) changes from the current operating level (whether OFF, Low,
or Normal) to Low level. In the case of remote control by an automation system, this Low level may be a more
comfortable setting than an actual change to silence (full o) - this is at the discretion of the installer. Typically
for ducking emergency notication, however, the Low level should be set to “MUTE.”
Contact closure has its own settable ramp up and down speed. Default ramp down will be instantaneous
as this matches expectations for ducking emergency notication. Ramp up will default to 5 seconds which
provides a more gentle recovery.
Contact closure overrides selections from the front panel. The keypad is locked, and the following is displayed:
When contact closure is released the unit returns to Normal level.
27
Paging / Music Input
Input A will be ON regardless of masking level or contact closure setting. (Meaning paging – if used – would
work even if masking is o).
System Acoustic Calibration
Masking volumes can be set in one of three ways:
Best: The Qt system 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 CRE Conguration App
Manual.
Good: If a sound level meter is available it is recommended that initially the control module’s masking
volume be adjusted up or down to achieve the values below. If the meter has a speed setting, set it to “Slow.”
Weighting should be set to “A.” Peak readings should be ignored, the appropriate value is the RMS or “eyeball”
average level. 37-40 dB in the 2 kHz octave or 45-48 dBA, measured 3-4 ft. (0.9 m) above oor level and
averaged spatially.
Otherwise: If a calibrated sound level meter is not available, the recommended levels are likely to be achieved
in most oce environments by setting the control module’s masking volumes as follows:
• 13-16, for 8 ft. (2.4 m) ceilings
• 15-18, for 10 ft. (3 m) ceilings
• 17-20, for 12 ft. (3.6 m) ceilings
Masking volumes must be set suciently high to achieve Condential speech privacy 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 but base the nal settings on site conditions and customer
preferences.
28
Special Installation Cases
When to leave sound masking on continuously: There are cases where leaving the masking on
continuously will minimize awareness of its operation. If the masking level in the emitter-covered area needed
to adequately mask speech from the conference room into adjacent space is determined to be below 40 dBA
we suggest leaving it on 24/7. This normally will be feasible only with very good sound isolating construction
between the conference room and adjoining spaces. Likewise, if a separate oce-wide masking system is
already in place and the QtCRE is intended merely to provide an extra margin of condentiality around the
sensitive space it can normally be left on continuously.
Adjacent conference rooms: If adjacent conference rooms are separated solely by suciently poor sound
isolating construction (lightweight “accordion” doors or those with poor or no seals at the top and bottom or
low quality lightweight or sound “leaky” demountable walls) it may not be feasible to obtain adequate privacy
between them, whether or not sound masking is installed around their perimeter. The solution in these cases
is to upgrade the party construction, not to add sound masking within or outside the rooms. If a listener can
understand speech easily in one room from a strong voiced talker in the other with no masking, it is a good
indication that condential speech probably will not be attainable between the two rooms. However, in some
cases involving only small conference rooms separated by at least fair isolating construction, sound masking
within the rooms may provide an adequate solution. Other markers for poor isolating construction are low
density glass ber acoustical ceilings within the rooms, especially if their party walls don’t extend completely to
the deck above or if there is no other plenum barrier above the party wall, and air return plenums common to
both rooms. Another is unlined inside air ducts serving both rooms which act as “speaking” tubes. Ducts with
exterior lining only will still act as speaking tubes since speech sound is transmitted through the interior of the
ducts, not along the exterior.
Conference rooms with open walls or open conference areas: It is not feasible to assure condential
privacy in an open plan oce if a source room where speech originates has open or partial height walls. The
best that should be expected is Normal privacy, meaning freedom from distraction and that conversations still
may be overheard by an intentional eavesdropper.
Adjacent private oces: In cases where masking is applied to a private oce near a conference room, it
may be appropriate to keep the same sound masking levels in that oce. However, if lower levels are required,
use the level trim settings on the back of the emitters in that oce – typically the -6 dB setting would be used.
Check to make sure the lower level is not compromising the privacy of the conference room.
29
Troubleshooting
Privacy signs do not illuminate
1. Check wiring polarity.
2. Note that the small switch on the side of the controller must be set to the “up” position (closer to the top of
the case) for the lights to work. The “down” setting enables the external USB jack, used for rmware
updates or for the optional Bluetooth dongle supplied the Qt100 iPad app.
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System commissioning with slow ramping is not possible
With traditional sound masking systems, a commission process is use that ramps up the sound masking over
several weeks’ time. In the case of the Qt CRE system, because sound masking is user-initiated at the time of
using the conference room, no commissioning ramp is used. Note that commission ramp is not possible from
the Qt CRE calibration app, even though the option is presented as possible in the app user interface.
30
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):
Error: 0_000000
Error Code for Zone 1
Reserved
Error Code for Control Module
Where a number other than 0 indicates an error.
Examples
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 code.
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.
31
Post-Installation Hando
Perform a nal 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 recongure 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)
support@cambridgesound.com
www.cambridgesound.com/support
32
Warranty
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.
Modications not expressly approved by the manufacturer could void the user’s authority to operate the
equipment under FCC rules.
Warranty Coverage — Qt® Emitters
Cambridge Sound Management, Inc. (the “warrantor”) will, for a period of ve (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 warrantor.
Warranty Coverage — ST 1000 control unit
The warrantor will, for a period of ve (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
warrantor.
All software installed in the Qt system is warranted to substantially conform to its published specications. 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 xes. It is the responsibility of the purchaser to download and install these software modications.
Except for the forgoing, all software and software upgrades are provided AS IS.
The following terms apply to all purchases:
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 borne by the purchaser.
33
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 cosmetic damage. THIS WARRANTY DOES NOT COVER USE OF THE SYSTEM
WITH ANY OTHER SPEAKER OR EMITTER MANUFACTURED BY ANY ENTITY, ORGANIZATION OR
COMPANY OTHER THAN CAMBRIDGE SOUND MANAGEMENT, INC. OR USE OF THE SYSTEM FOR
ANY PURPOSE OTHER THAN SOUND MASKING AND/OR PAGING AND/OR MUSIC DISTRIBUTION.
THIS WARRANTY DOES NOT COVER THE USE OF ANYTHING OTHER THAN CAT-3 OR EQUIVALENT,
24 GAUGE CABLING. The warranty ALSO DOES 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, modication, rental use, service by anyone
other than the warrantor or damage that is attributable to acts of God.
THERE ARE NO EXPRESS OR IMPLIED WARRANTIES EXCEPT AS LISTED UNDER “WARRANTY
COVERAGE.” THE WARRANTOR IS NOT LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL
DAMAGES RESULTING FROM THE USE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS
WARRANTY. As an example, this specically 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’s location. ALL EXPRESS AND
IMPLIED WARRANTIES ARE LIMITED TO THE PERIOD OF THE WARRANTY.
This warranty provides specic 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.
34
Zone Destination Record
Zone 1 Run 1 Run 2
Settings Record
Volumes:
Zone: 1
Masking:
Input A:
Installation / Service:
Company name:
Install date:
Phone:
35
Hole Cut Guide for Flush Mount Box
Hole cut guide for ush mount box
Cut hole to 7 1/2 in. (190mm) by 3 3/4 in. (95mm)
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37
Hole Cut Guide for Privacy Sign
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Cut hole wire 1/4 in (6mm) from lower edge of sign.
Hole shape is not important, but be careful to stay within area to be covered by sign.
REMEMBER TO CHECK ALL CONNECTIONS AND CONFIRM PRIVACY SIGN OPERATION
BEFORE ATTACHING TO WALL.
!
39
Addendum
This two page document is an addendum to the Qt® Conference Room Edition manual. Please read.
NOTE: Below are supplemental images for the content contained on page 15 of the Qt® Conference Room
Edition manual.
Connection to privacy signs
Run a separate cable from the controller mounting location to each lighting location. Do not daisy chain signs
as this may cause the light to be of dierent brightness. Two 50-ft. (15.2 m) plenum rated cables are provided
with the kit.
Panel 1
GND
Panel 2
GND -
Control
GND -
41
NOTE: Two new options have been added to the program menu of the Qt® Conference Room Edition. These
options are outlined below:
1. Contact Closure = Normal/O or Normal/Low. When this option is set to “Normal/O”, the contact switch
will toggle between Normal Volume (Contact Open) and O (Contact Closed). When this option is set to
“Normal/Low”, the contact switch will toggle between Normal Volume (Contact Open) and Low Volume
(Contact Closed).
2. Disable OFF Button = On or O. This option allows the user to disable the O Button on the front panel of
the Qt-CRE.
cambridgesound.com 800.218.8199
Qt and QtPro are either trademarks or registered trademarks of Biamp Systems, LLC in the United States and other countries. Other product names referenced may be trademarks or registered marks of
their respective owners and Biamp Systems is not aliated with or sponsored by these companies. All specications are subject to change.
Visit cambridgesound.com for the latest specication information.
42
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