Bose Direct / Reflecting 901 Series 4 - Manual (Page 11)

To use this method of connection, refer to your receiver
and
integrated amplifier owner’s instruction manual for
separating the main and preamplifier sections of the unit.
(This is usually accomplished by removing shorting wires or
plugs and/or moving a slide switch.) Connect the PREAMP-
OUT terminals to the equalizer INPUT terminals, and con­
nect the EQUALIZER OUTPUT terminals to 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 (he NORMAL position.
Tape recorders are now connected to the receiver or
amplifier in the conventional manner.
A. 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 901 s, connect
the equalizer In the channel powering the 901 speakers.
For the channels operating the conventional speakers, use
standard connection cables and connect 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 repeated
when using conventional speakers with the BOSE 901's.
This important procedure involves listening to musical
passages with deep bass to determine the proper phase of
your speakers. In most cases, this will require the reversal
of one pair of speaker connections.
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 phasing.
Note: Due to the spatial and spectral properties of the
901 Series (V system, optimum performance is obtained
when all four speaker systems are identical. However,
if four 901 's are not used, we suggest using speakers
having similar spatial characteristics, such as the Bose
Direct/Reflecting® 601 or Model 501 speaker systems
These speaker systems have been designed by Bose to
match the 901 system when used in quadraphonic
operation.
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