B&W PMKc 50 Manuel D'instructions page 3

INTRODUCTION
Since its foundation in 1966, the continuing
philosophy of B&W has been the quest for
perfect sound reproduction. Inspired by the
company's founder, the late John Bowers, this
quest has entailed not only high investment in
audio technology and innovation but also an
abiding appreciation of music to ensure that the
technology is put to maximum effect.
B&W installed speaker systems are designed for
simple and flexible mounting in wall or ceiling
cavities. However, no matter how good the
speakers themselves, they must work well into the
listening room and time spent on planning the
installation will reap the reward of many hours
listening pleasure. Please read through this
manual fully. It will help you optimise the
performance of the system.
B&W distribute to over 50 countries world-wide
and maintain a network of dedicated distributors
who will be able to help should you have any
problems your dealer cannot resolve.
UNPACKING
• Fold the top carton flaps right back and invert
the carton and contents.
• Lift the carton clear of the contents.
• Remove the inner packing from the product.
Check the contents:
• 2x Pre-mount frames
• 2x Retaining wings
• 1x Alignment template
• 1x Accessory pack containing:
9x Self Tapping screws
(For fixing PMK to studs)
We suggest you retain the packaging for
future use.
All manuals and user guides at all-guides.com
POSITIONING
Check that there is no conflict with other ceiling
installations (pipe work, air conditioning, power-
cabling etc.). In existing construction, use a stud-
finding tool to map the area accurately and a
pipe detector to scan the proposed installation
position. Avoid installing the speakers in the
same cavity of the wall as flimsy ducting, which
may be induced to rattle. The speakers are
designed to operate satisfactorily in a wide
range of cavity volumes, ideally above 15 litres
(0.5 cu ft).
The speakers are balanced for half-space
mounting (i.e. flush in a ceiling or soffit).
Placement near a wall/ceiling junction or in a
corner is to be avoided as it may give rise to too
much bass and a boomy quality to the sound.
If possible, keep the speakers more than 0.5m
(20in) from the ceiling edges.
The following sections give guidance on
optimum positioning, but this may be modified in
line with domestic constraints.
Normal Ceiling Applications
For distributed sound mount the loudspeakers in
the ceiling. The spacing will depend on the
height of the ceiling and the level of sound
required. More speakers played at a lower level
will give better clarity.
Home Theatre Surround Speaker
Applications
The sound from surround speakers should be as
diffuse as possible. This ensures that the frontal
audio image is not distorted by changes of
listener position or head movements. The
speakers should generally be placed behind and
0.6m (2ft) or more above ear height. Ceiling
mounting often gives good results in this
application.
WARNING: The CCM™ speakers produce a
static magnetic field that extends outside the
frame boundary. As such They should not be
placed within 0.5m (20in) of equipment that
may be affected by such a field, e.g. Cathode
Ray Tubes in TVs and Personal Computers.
DAMPING THE WALL CAVITY
Loosely fill the whole section of the ceiling cavity
with wadding. Fibreglass and mineral wool
matting supplied for heat insulation are suitable,
but not closed cell foam or expanded
polystyrene. Check that there is no debris that
may fall into the speaker (especially in ceiling
mount situations).
IMPORTANT: YOU SHOULD CHECK THAT THE
MATERIALS YOU USE MEET THE LOCAL FIRE
AND BUILDING REGULATIONS.
FITTING THE WALL FRAME
New Construction
(figure 1)
Use the template provided to position the correct
size aperture, having regard to how the wall
frame is to be lined up with any features such as
door frames.
Clip the two plastic wings to the pre-mount frame
(top and bottom for horizontal studs and each
side for vertical studs) Offer the assembly up to
the studs. Screw the wings onto the front of the
studs. Break the excess length of wings off on
either side of the studs. A tab is provided to
wire-tie the speaker wire to the PMK to keep it in
place during drywall phase. Trim hole for
speakers when drywall is installed.
After the drywall panels have been fixed and the
coating applied, fit the wall frame and speakers
as described in the user manual supplied with
the system.
1