Bowers Wilkins Speaker CWM7 User Manual

English  
CWM7  
 
1. CWM7 Carton Contents  
2. CWM7 Series Basics  
CWM7.3  
CWM7.4  
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CWM7.3  
• CWM7 Series speaker assembly (baffle, frame/back  
box, grille)  
• Reservoir box  
• Cut-out template  
• Paint mask  
CWM7 Series in-wall speakers comprise a baffle  
carrying the speaker drivers and crossover, an  
integrated back-box and front flange, and a  
magnetically secured grille. The back box is connected  
via external terminals to the speaker cables with the  
baffle connecting automatically as it is inserted in the  
back box.  
• Port plug  
• Blanking Plate  
• L-shaped push-lock fastener removal tool  
• Allen key (CWM7.3 only)  
• Document pack containing Quick Start Guide and  
Warranty information  
A reservoir box can be fitted within the wall either  
above or below the back box to enhance the speakers  
low frequency performance. The CWM7.3 incorporates  
a MF/HF baffle that can be rotated 90° to enable the  
speaker to be used in landscape orientation for centre  
channel applications.  
Environmental Information  
All Bowers & Wilkins products are  
designed to comply with international  
directives on the Restriction of Hazardous  
Substances (RoHS) in electrical and electronic  
equipment and the disposal of Waste Electrical  
and Electronic Equipment (WEEE). These symbols  
indicate compliance and that the products must be  
appropriately recycled or processed in accordance  
with these directives. Consult your local waste disposal  
authority for guidance.  
CWM7 Series speakers require wall aperture  
dimensions described in the following table:  
Model  
Aperture Height  
711mm (28 in)  
Aperture Width  
251mm (9.9 in)  
226mm (8.9 in)  
187mm (7.4 in)  
Reservoir Box Clearance  
465mm (18.31 in)  
CWM7.3  
CWM7.4  
CWM7.5  
390mm (15.4 in)  
331mm (13 in)  
465mm (18.31 in)  
390mm (15.4 in)  
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3. Positioning CWM7 Series Speakers  
CWM7.5  
All CWM7 Series speakers require a clear depth of  
102mm (4.02 in) from the front of the ceiling surface.  
The appropriate position for CWM7 Series speakers  
within the listening environment will depend on their  
specific application:  
Multi-channel Audio Applications  
For applications where multiple CWM7 Series speakers  
are to be used for multi-channel audio visual systems  
the left and right front speakers should be located  
either side of the screen approximately 0.5m (20 in)  
away. The centre channel speaker should be located  
either directly above or below the screen or, in the case  
of an acoustically transparent screen, directly behind.  
Surround channel CWM7 Series speakers should be  
located just behind and either side of the listening  
position.  
Note: The CWM7.3 can also be used in landscape  
orientation with aperture dimensions of 251mm  
(9.9 in) by 711mm (28 in) respectively height by  
width. No reservoir box is used with the CWM7.3 in  
landscape orientation.  
General Background Audio Applications:  
For applications where single CWM7 Series speakers  
are required to operate independently to provide  
background audio, they can be located substantially as  
installation convenience and architecture dictate. The  
only acoustic constraint to bear in mind is that corner  
locations will result in significantly emphasised low  
frequencies and should be avoided.  
Note: The reservoir box clearance is the clear  
distance within the wall above or below the aperture  
required to accommodate the reservoir box.  
Try to avoid corner locations for any of the speakers  
and to ensure that acoustic environment around each  
front and surround speaker is similar.  
Before installing CWM7 Series speakers you should  
ensure that the wall locations chosen are free of  
obstructions such as pipe work, ducting or wiring that  
will interfere with the installation. In existing dry-wall  
construction, use a stud-finding tool to help you map  
the wall construction and a pipe detector to scan the  
proposed installation locations.  
Stereo Audio Applications:  
For applications where a pair of CWM7 Series  
speakers is to be used for conventional stereo  
reproduction, they should be located between 3m  
(10 ft) and 5m (16.5ft) apart and a similar distance  
in front of the listening area. Try to avoid corner  
locations for the speakers and to ensure that acoustic  
environment around each speaker is similar.  
Note: Different acoustic environments might be,  
for example, a bare wall and a heavily curtained  
window.  
Note: The nature of the installation of in-wall  
speakers means that it is sometimes impractical to  
locate them in the acoustically ideal positions. In  
these cases they should be located as close as is  
practical to the ideal positions. Your local Bowers  
and Wilkins retailer will be able to offer advice if  
required.  
Note: CWM7 Series in-wall speakers will most often  
be installed in existing walls, however, if they are  
to be installed in newly constructed walls a pre-  
mount kit that aids appropriate wall construction is  
available. Contact your local Bowers and Wilkins  
retailer for more information.  
Note: Different acoustic environments might be,  
for example, a bare wall and a heavily curtained  
window.  
Note: CWM7 Series drive units create stray  
magnetic fields. We recommend that magnetically  
sensitive items such as CRT screens and magnetic  
cards for example, are kept at least 0.5m (20 in)  
from the speaker. LCD, OLED and plasma screens  
are not affected by magnetic fields.  
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4. Installing CWM7 Series Speakers  
To install a CWM7 Series speaker proceed as  
described in the following paragraphs:  
4.2 The reservoir box enhances the low frequency  
performance of CWM7 Series speakers. It connects  
to the top or bottom of the back box via a hinge and  
clamp that enables it to be fed into the wall cavity  
above or below the back box. CWM7 Series speakers  
are shipped set up for the reservoir box to be installed  
below the back box. If this is not practical, perhaps  
thanks to the encroachment of drywall frame noggin  
(horizontal brace), the reservoir box can be swapped  
for use above the back box.  
4.3 If speaker cable is already present in the wall  
space, pull the cable through the aperture. If speaker  
cables are not already installed this should be done at  
this stage. It is likely that you will need to gain access  
through the floor above to route the cables down into  
the wall cavity.  
4.1 Using the supplied cut-out template, mark a cut  
line on the wall. Check the cut line defines the correct  
dimensions. Cut along the line with an appropriate tool  
to create an aperture in the wall.  
Leave enough spare cable through the aperture to  
ease connection to the speaker back box, but not so  
much that it is likely to buzz or rattle when pushed  
back up into the cavity. Approximately 1.0m is  
appropriate.  
Note: Ensure that there is enough free space  
internally adjacent to the aperture for the back box  
clamps to rotate fully outwards. 20mm (0.79 in) free  
space is required.  
Note: An arrow symbol on the back box illustrates  
upward orientation.  
Note: To reduce the possibility of the ceiling buzzing  
or rattling, adhesive mastic can be applied between  
the studs and sheetrock in the vicinity of the  
speaker aperture.  
Note: Always use high quality, low resistance  
speaker cable. Low resistance is especially  
important if the length of cable from amplifier to  
speaker exceeds 5m. Your local Bowers and Wilkins  
retailer will be able to offer advice on speaker cable  
selection if required.  
To swap the reservoir box location, the blanking plate  
screwed to the lower inside panel of the back box  
must be unscrewed and replaced to cover the hole in  
the upper inside panel. Ensure that the thumb screws  
securing the blanking plate are adequately tight. The  
diagram above illustrates the removal and replacement  
of the blanking plate and attachment of the reservoir  
box.  
We recommend that the reservoir box is always used  
if possible, however with a CWM7.3 speaker installed  
in landscape orientation, use of the reservoir box is not  
possible. If no reservoir box is used a blanking plate  
must be fitted to both back box holes.  
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4.4 Now connect the speaker cable to the spring  
terminals on the side back box, first looping the  
cable around the strain relief bar. The diagram above  
illustrates cable connection.  
4.5 With the back box connected to the cable and its  
reservoir box attached it may be inserted into the wall  
aperture and cavity. Correct back box orientation must  
be established at this stage: the red arrow on the back  
box flange should be pointing upwards.  
4.6 If the back box flange is to be painted it should be  
done at this stage. Any conventional, domestic paint  
may be applied by brushing, rolling or spraying. Use  
the supplied paint mask to avoid getting paint in the  
back box cavity. Painting without using the paint mask  
risks contamination of the internal connection terminals  
or the grille attachment magnets. The diagram above  
illustrates painting using the paint mask.  
Ensure that the speaker connection polarity is  
correct: the cable connected to the positive terminal  
on the amplifier should be connected to the red  
spring terminal on the back box. Similarly, the cable  
connected to the negative terminal on the amplifier  
should be connected to the black spring terminal on  
the back box.  
Ensure that the clamps are retracted so that they will  
pass through the aperture then feed the reservoir box  
into the cavity below (or above) the aperture followed  
by the back box itself into the aperture. Take care that  
the cable is not trapped. When the reservoir box and  
back box are adequately seated in place the clamps  
can be tightened. The diagram above illustrates  
insertion of the reservoir box and back box.  
Note: If the grille is to be sprayed this should be  
done “off-line” before it is fitted.  
Note: If an amplifier is already connected to the  
cable it should be switched off while connections  
are being made to the back box.  
Finally tighten the two thumbscrews to secure and seal  
the reservoir box.  
Note: If no reservoir box is fitted the back box is  
simply inserted straight into the aperture.  
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4.7 The baffle can now be inserted into the back box.  
The baffle insertion and attachment technique is slightly  
different in the case of the CWM7.3 and CWM7.4/5.  
In both cases however you should first ensure that the  
connector on the baffle is oriented correctly with the  
connector inside the back box.  
CWM7.3 Baffle Insertion  
With the MF/HF baffle in the correct orientation the  
baffle assembly can be lifted and inserted in the back  
box till it is just sub-flush of the back-box flange. Take  
care to ensure that the electrical connector lines up.  
The baffle is held in the back box by eight screws.  
Tighten the screws to a torque of 1.5Nm. The baffle will  
then be secured in the back box.  
If the CWM7.3 is to be used in landscape orientation  
the MF/HF baffle must be removed and rotated 90°  
so the tweeter is uppermost in the installed speaker.  
If necessary, this should be done before the baffle is  
inserted in the back box.  
To rotate the MF/HF baffle first remove the four screws  
holding it in place. Now, with your hand gently over  
the midrange driver, lean the whole baffle assembly  
forward slightly so that the MF/HF baffle begins to fall  
out. Do not let it fall completely but return the baffle  
to the upright position while holding the MF/HF baffle  
out of its rebate. Finally withdraw the MF/HF baffle  
completely, turn it 90°, reseat it in the rebate and  
replace the four screws. Tighten the screws to a torque  
of 1.5Nm. The diagram above illustrates removal and  
rotation of the MF/HF baffle.  
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CWM7.4 and CWM7.5 Baffle Insertion  
4.8 A port plug accessory is included with CWM7  
Series speakers. The plug can be used if desired to  
reduce bass output by obstructing the speakers reflex  
port. Simply push the plug into the reflex port. The  
diagram above illustrates insertion of the port plug.  
The CWM7.4/5 baffle assembly is held in the back  
box by a combination of hinge features and push-lock  
fasteners. To secure the baffle assembly in the back  
box, lift the baffle up to the back box and engage the  
two pegs on its lower edge at an angle within the holes  
inside the back box flange. Now simply rotate the baffle  
inwards so that the electrical connector engages and  
the baffle sits just sub-flush of the back-box flange.  
The baffle is held in the back box by two push-  
lock fasteners. Push-lock fasteners are secured by  
pushing the head inwards – either with a thumb or a  
screwdriver. As they secure, the fasteners will click  
three times. The baffle will then be secure in the back  
box. The diagram above illustrates inserting the baffle  
and securing the push-lock fasteners.  
Note: Push-lock fasteners are unsecured by turning  
anticlockwise with a screwdriver. The supplied  
L-shaped tool can now be used to hook and lift  
behind the fastener head.  
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4.9 The grille can now be fitted to the baffle. It is held in  
place magnetically so simply needs to be aligned with  
the groove in the back box flange where it will click into  
place. The diagram above illustrates fitting the grille.  
The CWM7 Series speaker is now installed and ready  
for use.  
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B&W Group Ltd  
Dale Road  
Worthing West Sussex  
BN11 2BH England  
B&W Group (UK Sales)  
T +44(0)1903221500  
Copyright © B&W Group Ltd. E&OE  
B&W Group North America  
T +19786642870  
T +44 (0)1903221800  
F +44 (0)1903221801  
B&W Group Asia Ltd  
T +85234729300  
 

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