Bose Direct / Reflecting 901 Series 4 - Manual (Page 18)

Technical Information
B. 110-220 VAC VOLTAGE CONVERSION
The BOSE Series IV Equalizer is designed to operate on one
power line voltage only.
Equalizers manufactured for 120 VAC operation are not con-
vertable to 240 volt operation except by factory modification.
Equalizers manufactured for 240 VAC operation may be con­
verted to 120 VAC operation by BOSE Authorized Factory Ser­
vice Agencies. (The speakers require no voltage conversion.)
C. IN CASE OF DIFFICULTY
If you suspect that there is a problem with your 901 system, it
is worth a few minutes of your time to determine whether your
901s are defective, and if so, what part of the system is defec­
tive.
If
one speaker sounds defective, DO NOT switch the
speaker cables, as this may damage the speaker operating
correctly. Instead, disconnect the wire of the speaker sus­
pected of being defective at the amplifier output and reconnect
to the amplifier channel operating correctly. (This can generally
be done without disconnecting the correctly functioning
speaker.) If the speaker system that sounded defective now
plays correctly, the difficulty is not in the speakers or in the
speaker wiring.
If bass and high frequencies seem weak, check to assure
that the equalizer is in the circuit.
If you hear distortion when both speakers are operating at
high sound levels that disappears when you turn the volume
down or push the Low Filter switch "In." you are probably
overloading the amplifier.
If the trouble seems to be in the equalizer, be sure that the
system operates properly with the equalizer out of the circuit.
This can be determined by disconnecting the equalizer from
the circuit, Be certain that all cables are connected properly
and that the cables are not defective.
If the trouble still persists, contact your dealer. He will arrange
for service or have the unit checked for proper operation. The
complete procedure for obtaining service is outlined in the
warranty found in SECTION Vli of this manual.
D. CARE AND MAINTENANCE
Your 901 speaker cabinets and equalizer are made with an oil-
rubbed walnut veneer finish. Any good grade of furniture
polish used for wood finishes can be used in normal dusting
and cleaning: however, to maintain the beautiful appearance
of your 901s, we suggest occasionally rubbing the cabinet
with linseed oil. After rubbing, use a dry cloth and polish off
any excess oil.
Grille cloths generally require no care, although they may be
carefully vacuumed if necessary.
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