Bose 901 IV Series User Manual

To use this method ot connection, refer to your receiver
arxS integrated amplilier owner's Instruction manual for
separating the main and preamplifier sections of the unit.
(This is usually accomplished by rerr>ov)ng shorting wires Or
plugs and/or movir>g a slide switch.) Connect the PREAMP-
OUT terminals to the equaliier INPUT lermtnals, and con¬
nect Ihe EQUALIZER OUTPUT terminals 10 the MAIN-IN
terminals of the receiver or integrated amplifier (see Figure
6). With this method of connection, do not use the tape
recorder connection jacks on the equalizer and leave the
TAPE switch (on the equalizer) in the NORMAL position
Tape recorders are r>ow connected to the receiver or
amplifier in the conventional manr>ar.
4. Using Four-Channel Equipment
Most quadraphonic receivers have four-channel tape moni¬
tor or preamp out/main in connection jacks. These connec¬
tion jacks can be used for the BOSE equalizer.
If two pairs of 901s are used, two active equalizers are re¬
quired. Connect one equalizer for the front channels and
one for the rear channels.
If conventional speakers are used with the 90is, connect
the equalizer in the channel powerirtg tne 901 speakers.
For the channels operating the conventional speakers, use
standard connection cables and conrtect the input to the
output jacks directly
Phase reversal occurs when the 901 equalizer is con¬
nected in the circuit. For this reason, your control
amplifier’s speaker phasing procedure should be repealed
when using conventional speakers with the BOSE 90V3
This important procedure involves listening to musical
passages with deep bass lo determine the proper phase of
your speakers, tn most case8» this will require the reversal
of one pair of speaker conneotions
For separate components, connect the equalizer after the
output of the decoder. We suggest reading the related sec¬
tions of this manual before proceeding. Also, be certain to
recheck your speaker pha8ir>g.
Note: Due to the spatial and spectral properties of the
901 Series IV system, optimum psrformanoe is obtained
when all four speaker systems are idenilcal. However,
If four 901*8 are not used, we suggest using speakers
having similar spatial characteristics, such as the Bose
Direct/Refiectir>^ 601 or Model SOI speaker systems
These speaker systems have been dasigrred by Bose to
match the 901 system when used in quadraphonic
operation.
11

Bose 901 IV Series Specifications

General

Impedance	8 Ohms
Enclosure Type	Acoustic suspension
Weight	35 lbs each
Configuration	Stereo
Drivers	Nine 4.5-inch full-range drivers
Crossover Frequency	No internal crossover