Bose 901 Series III - Manual (Page 17)

в. SPEAKER PLACEMENT
Several options are possible regarding placement of your 901s
in your listening room. Shelving that is deep enough to provide
the necessary distances behind and to the side of the speaker
system can be used if available Make certain the shelving is
substantial and is not the same shelf used to hold yoitr turn­
table (as possible acoustic feedback can occur)
Many people choose the attractive pedestals available with tlie
901 system These metal stands can be purchasecf from your
BOSE dealer and are convenient in placing the speaker system
in your room If you choose tins method of support, instructions
are provided with the pedestals for connecting and mounting
the speaker system. A new pedestal (Model PS-3) is available
for the 901 Series III and utilizes a four-hole mounting pattern
Another placement Idea is to suspend the speaker system from
the ceiling (see Figure 1) This is generally accomplished
by using decorative chains and hardware available from most
lighting accessory stores This placement method is particularly
attractive if wall surfaces are interrupted by windows or door­
ways or floor speaker placement is difficult due to furniture or
the presence of small children
If you decide to hang your speakers, place the Part 1 speaker
on the left side of the room and the Part 2 speaker on the right
side of the room Turn the speakers upside-down and place
them on a covered surface or rug.
You will notice that each speaker has four predrilled holes on
the bottom. The holes have been provided to accommodate
the rubber feel supplied or for locating eyehooks for ceiling
hanging
Screw heavy duly eyehooks into the bottom of the speaker
cabinet. Use either decorator chain or wire to suspend the
speakers from a ceiling stud DO NOT fasten these chains Into
plasterboard as this will not provide adequate support. Keep in
mind that you are suspending a 35-pound speaker. Each chain
should be able to support the weight of the entire speaker
system alone. Be certain to fasten these chains into a wood joist
or adequate ceiling support to prevent possible ceiling or
speaker damage.
If you have placed your speakers quite high in your room, the
sounci can be directed downward by angling the rear of the
speaker down. The sound will be directed downward after it Is
roliccted olf Ihe rear wall. This is accomplished by Increasing
the length of the rear chain(s) holding the speaker system
C. ROOM ACOUSTICS
The acoustical properties of the room (such as the size, shape,
construction, and furnishings) play an Important pari In the
quality of sound produced by your high-fidelity system
A lack of bass response frequently may be attributed to walls of
thin panel construction, large openings (e g . doorway), or ex­
cessive window glass, which allow low frequencies to pass
through rather than reflecting them into the listening room.
The overly bright sound of acoustically "live" rooms (e g . those
with uncovered floors or scatter rugs, small amounts of furni­
ture. hard walls) can be improved by the addition of rugs and
heavy drapery, which also serve to eliminate echoes and stand­
ing waves For acoustically "dead” rooms eg. rooms with wall-
to-wall carpGiing. heavily upholstered furniture and draperies,
furnishings should be rearranged or removed.
Finally, since no room is acoustically perfect, you are encour­
aged to use your amplifier tone controls and equalizer controls
to adjust the sound for your maximum listening enjoyment.