14
Combinations of A, B, and C
Each stereo channel has three sets of output terminals, A, B,
and C. One way of using these outputs is to group two (A+B
or A+C) speakers together for each stereo channel. If the
speakers for each channel are separated by about three feet
this will give a broader front to the stereo effect. The bottom
figure shows the set-up.
Another way of using the outputs is for the A speakers to be
in one room, the B speakers in a second room and the C
speakers in a third room. This permits full stereo operation
in two out of three of the rooms simultaneously, as shown in
the figure.
Where should the speakers be placed?
The best position for speakers in a room depends upon the
room acoustics and the type (or types) of speakers you use.
Four basic arrangement are shown in the adjacent figures. It
is particularly in the bass region where you are likely to
have too much or too little or an uneven sound picture.
Room acoustics
Loudspeakers are designed to provide a sound picture
judged to be correct in an "average" position in an "average"
room. However, no two rooms and no two speakers are alike
so it pays to consider the shape, size, structure, and
furnishings of a room when it comes to buying and si t i ng
loudspeakers.
You u su al l y cannot do much about the shape and size of a
room except possibly by using acoustic screens to make it
non-symmetrical. As Far as possible the floor, ceiling and
walls should not be too hard. Thick curtains, carpets, soft
furniture, soft wooden panels and acoustic tiles all help to
reduce excessive reflections.
Stereo tips
The following tips may help you with your stereo
set up.
1.
Place the speakers at the same height and (as far as
possible) on the same level as the listener's ears.
2.
Keep the space between the listener and the speakers
clear.
3.
Arrange the acoustic structures and surfaces in the room
adjacent to the speakers to be the same for both speakers.
Conventional siting of a moving-
coil speaker system in a corner of
a room to obtain maximum bass
response and even excitation of
room modes.
Alternative siting of a speaker
away from walls. This may reduce
excessive bass response or give
optimum coupling for an
electrostatic speaker.
Using (A+B) or (A+C) parallel
speaker outputs to obtain a
broader stereo front.
ConventionaI siting of two speakers in
a stereo system. The distance
between the speakers
should be about 2/3 the distance
to the listener. The speakers may be
angled inwards with
advantage.
Summary of Contents for TR-2075
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