Speaker Placement - Bose 901 II Series Owner's Manual

l. INTRODUCTION
Thank you for purchasing the BOSE 901 Series II Direct/Reflecting® speaker system. The listening enjoyment ex-
perienced with your BOSE 901s culminates many years of research and dedication to the art of bringing the finest
musical reproduction into your home.
THE BOSE 901 with its unique shape, 9 drivers, and Active Equalizer incorporates a number of major advances in
speaker technology. It is designed, installed, and connected differently from conventional loudspeakers. These major
differences contribute directly to the new level of realism of music reproduction provided by the 901 speaker system.
The detailed installation and placement instructions are important. PLEASE TAKE THE TIME TO READ THIS
MANUAL, as this is the only way you will obtain the full benefits of the 901's unique design. You will be amply
rewarded by the listening pleasure which your 901s provide, when properly installed.
Il. UNPACKING YOUR 901s
The 901 speaker system is packed in two cartons marked "Part 1" and "Part 2." THE ACTIVE EQUALIZER IS
CONTAINED IN A CARDBOARD WEDGE FOUND IN PART 1. Unpack both cartons carefully. (Save the cartons
{v and packing materials for possible use later.) If either the speakers or the Equalizer are visibly damaged when you un-
pack them, do not place the system in operation. Repack the speakers and the Equalizer in the original cartons and
notify your dealer immediately. (See Section V.)
Ill. INSTALLATION OF YOUR 901s
A. SPEAKER PLACEMENT
One of the most important advantages of the BOSE 901 speaker system is that it is designed to operate properly
in most listening rooms, not in anechoic test chambers. The superior dispersion characteristics of the 901 allow
considerable freedom of placement and an unusually large "best listening area." To obtain the full performance
of the 901, you must follow the placement guidelines in this section.
The angled (vee shaped) grille cloth panels are the back of the 901. Point the vee toward the wall. The distance
of the speakers from the wall is very important. The point of the vee should be 12 inches from the wall. 20 Cc
(Although the 901 was designed to be placed 12 inches from a reflecting wall, satisfactory performance can be ;
obtained anywhere within the range from 8 to 24 inches.) The point of the speaker should be aimed directly at
the reflecting wall, and NOT directly into a corner (See Fig. 1).
+18"-36'
46 - FA
~_ DO NOT PLACE HERE
(Half-way point between
ceiling and floor)
É
18"-36"
Ke -4
FIG. 1
The reflecting wall ideally should be made of a dense, solid substance such as wood, brick, cement block, plaster,
or sheetrock. Substances like glass, pegboard, cork, or acoustic tile make ineffective reflecting walls. (The
Equalizer is designed to accommodate surfaces which might otherwise present problems. [See Section IV B.] )