CAMBRIDGE biamp QtRC Operating instructions

Qt™ Room Control
Installation and Operations Guide

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Table of Contents
Package Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Qt Room Control Volume Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installing the Qt Room Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Typical Installation Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Two Zone System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
One Zone System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
A Single Room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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Package Contents
QtRC Package contains:
• 1 - QtRC volume control
• 1 - White Decora® style wall plate
• 1 - Manual
• 1 - Set of white-tipped screws (2 pieces)
• 1 - White knob (installed)
• 1 - White Decora center plate

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Overview
The Qt Room Control (QtRC) can be used to adjust the sound masking level for an individual room or a space
with 2-8 emitters. This wall-mounted volume control unit is designed to work with any of the Cambridge Sound
Management (CSM) sound masking systems. It installs easily in new or existing construction and ts in most
standard electrical boxes, including open back, low voltage brackets.
Since the QtRC is designed for a room of up to 8 emitters, a separate zone should be used in larger areas. The
QtRC controlled room can be on its own run from the controller or part of a run to other areas. Several system
layout options are shown on the following pages and, with each layout, a suggested usage model is described.
When using the QtRC, the CSM controller needs to supply enough power over each cable run for the emitters
and the volume control unit. From the CSM controllers, a single cable run can support 60 emitters; however,
an added QtRC reduces the number of emitters that can be supported, because each QtRC is treated as an
emitter in the total for the run. The cable run can support a combination of up to 60 emitters and QtRCs. For
example, if there are 30 rooms with 2 emitters in each room, or a total of 60 devices (2 x 30 emitters), then
a single run of cable could be used. However, if a QtRC is also used in each room, changing the total to 90
devices (2 x 30 emitters + 30 QtRCs), then 2 cable runs would be required.
Qt Room Control Volume Settings
The QtRC features a six position switch that adjusts the sound masking volume in approximately 2.5 dB
increments. The volume will increase as the knob is rotated clockwise, with the maximum level at the 5 position
as shown in Figure 5.1.
The minimum level will be achieved at position 0. Alternately, this position can be set at time of installation
to turn o󰀨 the sound masking entirely. This option is controlled by a slide switch on the QtRC assembly. See
Figure 5.2. The “OFF” position is labeled on the circuit board. Slide the switch to marked “OFF” side to make
position 0 turn the sound masking completely o󰀨. Slide the switch to the “Normal” position to make position 0
use the minimum level. This must be selected before installation into the wall.
We suggest that the QtRC knob be at position 5 (full clockwise) when the room’s sound level is being
calibrated and set on the controller. This allows the user to use this system as calibrated or reduce the sound
level down in 2.5 dB steps.
Alternatively the QtRC knob may be at position 3 when the room’s sound level is set on the controller. This
option allows the user to adjust the sound level up or down in 2.5 dB steps.
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Installing the Qt Room Control
The QtRC is designed to be installed in a single gang box or low voltage bracket. All power is supplied from the
control module, so only CAT cables in and out are required. There are also no requirements for grounding
since it is done over the CAT cables.
Typical Installation Options
Sound masking is best used at a constant level so it is perceived as part of the building’s environment.
However, there are specic types of situations, such as in hospital rooms, o󰀩ces, and conference rooms,
where it is desirable to be able to adjust the masking level. In this situation, a cable can be brought to the
room’s QtRC and then connected to the emitters in the room, as discussed below. The QtRC will be able to
decrease the power supplied to the emitters in the room, thus decreasing the perceived volume. The following
sections and diagrams show the various layout options.
Two Zone System
In the diagram below, Figure 7.1, the CSM controller has two or more zones.
The cable run from the rst zone (black) services the open area while the cable run in the second zone (red)
services the 3 closed rooms. The rst part of the second zone cable run connects to the rst QtRC (blue box)
at its built-in splitter (by the input jack labeled “In”). Next, the “Room” output jack on the rst QtRC connects to
a length of cable (green) to create a mini control area in the room with two emitters. Another length of cable
(red) connects the “Out” output jack on the rst QtRC to the “In” input jack on the QtRC to the next room, and
so forth, until each of the three rooms in the second zone has its own QtRC (blue box) and set of emitters (on
green cable). After installation, each room will have the same maximum volume while the emitters in each
room can be turned down by each room’s QtRC.
Figure 6.1 Figure 6.2
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Figure 7.1

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One Zone System
The layout below is the optimal layout when using QtRCs. With the use of a QtRC, each room’s occupant may
choose sound masking levels at or below the calibrated level. It is recommended that this level be at 42 dB for
a closed room, if calibration was done with the QtRC set to max (clockwise). Alternatively, by calibrating the
rooms’ sound masking to be correct with the QtRC at step 3, each room occupant will have the ability to raise
or lower the sound masking level.
NOTE: Since each QtRC has a built-in splitter, there is no need for an extra splitter or cabling when
implementing the layout shown in Figure 7.1.
The cable from the CSM controller reaches splitter #1. One cable (red) from the splitter connects to QtRC #1
(blue box) in the rst room, while the other cable continues down the hallway (red). In the room, a cable (green)
is run from the QtRC “Room” jack to the input port of the rst emitter (red). Then a cable (green) is run from the
output port of the rst emitter to the input port of the next emitter (red). (Figure 9.1)
The cable that was extended down the hallway reaches a splitter that is used in the same way. A cable from
splitter #2 goes to the next room, connects to QtRC #2 while another cable continues down the hallway. A
multi-way splitter can be used as long as the maximum number of devices on a run doesn’t exceed 60 (as
shown with splitter #3 connecting to QtRC #3 and QtRC #4).
The layout in Figure 9.1 allows each room’s occupant may choose sound masking levels at or below the
calibrated level, recommended to be 42 dB for a closed room if calibration was done with the QtRC set to max
(clockwise). Alternatively, by calibrating the rooms’ sound masking to be correct with the QtRC at step 3, each
room occupant will have the ability to raise or lower sound masking level.
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Figure 9.1

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A Single Room
In the diagram shown below (Figure 10.1), the maximum volume for the room with an QtRC is the same as the
volume of the emitters in the open area. The power supplied to all of the emitters in the open area is the same
as the power supplied to the QtRC. The QtRC has the ability to reduce the power supplied to the emitters
within the closed room. Since a closed room typically requires a lower sound masking level than an open area,
with the use of a QtRC, a closed room can achieve this lower level by decreasing the maximum level. (Figure
10.1)
NOTE: Each QtRC’s coverage zone may have a maximum of 8 emitters. The maximum number of rooms
supported on a single run from the CSM controller is determined by ensuring that the total number of emitters
and QtRCs does not exceed 60 devices.
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Figure 10.1

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Decora® is a registered trademark of Leviton Manufacturing Co., Inc. All rights reserved.
Warranty
The warrantor will, for a period of one (1) year, starting with the date of purchase, warrant that the Qt Room
Control (the “device”) 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 device, with new or refurbished parts, or (b) replace the device with a new
or refurbished device of equal functionality at no charge. The decision to repair or replace will be made by the
warrantor.
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 on-line 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.
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 EMITTER OR EMITTER MANUFACTURED BY ANY ENTITY, ORGANIZATION OR
COMPANY OTHER THAN CAMBRIDGE SOUND MANAGEMENT, LLC, 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 emitter installation, set-up adjustments, mis-adjustment of controls, improper
maintenance, power line surge, lightning damage, power surges, modication, 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.” 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 specically 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

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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.
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