Bose 901 Series III - Manual (Page 13)

To use this method of connection, refer to your receiver
and integrated amplifier owner s instruction manual for sep­
arating 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 connect
the EQUALIZER OUTPUT terminals to the MAIN-IN termi­
nals of the receiver or integrated amplifier (see Figure 6)
With this method of connection, do nol use the tape recorder
connection jacks on the equalizer and leave the TAPE switch
(on the equalizer) in the NORMAL position Tape recorders
are now connected to the receiver or amplifier in the con­
ventional manner.
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 901$. connect
the equalizer In the channel powering the 901 speakers For
the channels operating the conventional speakers, use stan­
dard connection cables and connect the input to the output
jacks directly.
Ptiase reversal occurs when the 901 equalizer is connected
in the circuit, For this reason, your control amplifier s speak­
er phasing procedure should be repeated when using con­
ventional speakers with the BOSE ^Ts. This important pro­
cedure 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 rending 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 III system, optimum performance is obtained when
all four speaker systems are identical However, if four
901s are not used, we suggest using speakers having
similar spatial characteristics, such as the Bose Direct/
Reflecting* 501 or Model 301 speaker systems These
speaker systems have been designed by Bose to match
the 901 system when used in quadraphonic operation
13