Bose Direct / Reflecting 901 Series 4 - Manual (Page 6)

Installation
i
1
B. CONNECTING THE SPEAKERS
1. Wire Selection
If the wire used to connect the speakers to your power ampli­
fier has too much resistance, audible coloration of the
sound and loss of power can result. The table below sum­
marizes maximum wire lengths for 18-, 16-, and 14-gauge,
two-conductor, stranded copper wire for use with one or
two pairs of BOSE 901 loudspeakers.
TABLE 1
RECOMMENDED CONNECTION WIREt
.Wire Length
One Pair
of 901s
Wire Length
Two Pairs
of 901s
Type of Speaker
Hook-Up Wire
27 feet 13 feet 18-gauge zipcord
(or two-conductor wire)
42 feet 21 feet 16-gauge two-conductor
wire
67 feet 34 feet 14-gauge two-conductor
wire
In most instances, copper zip-cord, readily available at
most electrical and hardware stores, can be used for
speaker connection. This wire usually has a ribbed line(s)
along one side of the insulation so that each wire can be
identified for proper phasing of your speaker system.
tThe wire lengths snown m Table i were calculated on the bass oJ a rnaJtimum auditHe
colorat on ot ^0 5dB Following ihegudelmes provided, the most discerning listener
will be unable to detect any coloration introduced by the speaker wire Most listeners
will not notice any eHect isven if wire lengths are increasec by as much as 5054
2. Phaslng/Wiring
ft is important that the amplifier connections for both
901 speaker systems be identical (see Figure 3) so that
both speakers work together (in phase).
a. Start with the speaker marked "Part 1."
b. Place it on the left side of your room facing the
speaker system.
c. Locate the “ + " and terminals on the bottom of
the speaker.
d. Using the speaker wire (which is marked to distinguish
one conductor from the other), connect the "Part 1"
speaker terminal marked to the terminal marked
“com." "negative," or "minus" on the left channel
amplifier output. (When connecting the 901 Series IV
loudspeakers to your amplifier, if there is a choice of
impedances on the amplifier output, use the terminal
marked "8" or "8 ohms.” If two pairs of 901 Series IV
loudspeakers are being connected, the terminal marked
"4" or "4 ohms" on the receiver or amplifier should be
used.)tt
e. Connect the “- f " terminal on the left speaker to the
terminal marked "pos." "positive.” or “plus" on the left
channel output of the amplifier or receiver.
NOTE: Use only the terminals marked “ + " and
The terminal marked is intended for future electro­
nic developments and should not be used with conven­
tional amplifying equipment.
ttNote When operating your 90is m stereo, only one equalizer is required if addi*
tioriat pairs of 901$ are used, they can be purchased without the equalizer. These
speakers are sokJ as ' add-on'' pairs and can be connected as extensor speakers or
used in addition to the iirst pair of speakers
When connecting two pairs of 901 speakers to your equipmeni, v/ire the speakers m
parallel: most recently manufactured receivers or amplitiers
wj I operate two pairs of
901$ wired n this manner. However, if your receiver or amplifier is not caceWe of
4-ohm ocerato.^ with two pairs of 90is. w^re the speakers in se.nes. Contact your
dealer if any further assistance is required