Bose 901 Series II - Manual (Page 11)

Additionally, the dispersion can be adjusted by rotating the speakers. For instance, if you wish more sound
to come from the left side of one of the speakers, rotate the rear of the speaker (the vee) to the
left. This technique can also be used to direct sound away from an obstacle (for example, a piece of
furniturej or an opening into an adjacent room. (See F«g. 7.1
The 901s also can be hung from the ceiling. As well as being an effective and interesting decorating
approach, this is a useful method of installation where speaker placement might be difficult due to
furniture, location of doorways, and/or small children. The hardware is readily available at most stores
carrying decorative lighting accessories. We recommend using a three or four point suspension, with three
or four pieces of decorative chain or other strong material. These are attached to the bottom of the 901
cabinet via decorative hooks or eyelets screwed into the cabinet. Keep in mind that each 901 weighs 33
pounds; therefore, use hardware strong enough to support this weight.
The 901 speaker should be placed no closer than 18 inches from the ceiling. If you prefer to suspend the
speakers far above the listening area in a high ceiling room, the sound can be directed downward by angling
the rear of the speaker down. The sound will then be directed downward after it is reflected off the rear
wall. The speaker can be tilted in this manner by adjusting the length of the rear chain(s).
8. ADJUSTING THE EQUALIZER CONTROLS
FIG. 8
BELOW 40
Another way of altering the performance of the 901 system is to adjust the Equaliaer controls. The first
Equalizer control is labeled BELOW 40. This control causes a uniform reduction in bass response of
approximately 8 d6 below 40 Hz. If distortion occurs when you are playing loud musical material with a
great deal of deep bass content, move this switch from the dotted position to the CONTOUR position.
This will allow you to play the system louder, especially with low-powered amplifiers or receivers. This
control is effective also in reducing ‘'rumble*' from older turntables or recordings.
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