Bose 901 Series III - Manual (Page 19)

B. 110-220 VAC VOLTAGE CONVERSION
The BOSE Series III Equalizer is designed to operate on one
power line voltage only. If it becomes necessary to convert your
equalizer to another line voltage, contact the closest BOSE
Authorized Factory Service Agency or the BOSE factory. (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
901 s are defective, and if so. what part of the system is defective.
If one speaker sounds defective, DO NOT switch the speaker
cables, as this may damage the speaker operating correctly.
Instead, disconnect the defective speaker s wire at the ampli­
fier 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 switch the "Below 40“ switch to "Contour." you are probably
overloading the amplifier
If the trouble seems to be in the equalizer, be sure that the sys­
tem 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 VIII 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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