Audio Input - Acoustat SPECTRA 1100 Owner's Manual

WARNING: Always unplug the AC (POWER) input
and audio feeds before accessing the inside of the
Interface.
1) Even after the power is removed, a high voltage charge
remains on the array for at least many hours.
2) To discharge the array, remove the RED coded array wire
and touch its (while holding the wire's insulation, NOT
tip
the metal plug) to any other array wire connection. Unless
the speaker has been de-energized for some time, expect
to see a spark and hear a snap from the speaker.
3) The speaker will now
bly may procedd.

Audio Input

The red/black input terminals are standard, 3/4"
banana jacks. They may accept single or dual banana plugs,
spade lugs, pin plugs, or bare wires.
There are four possible ways to connect the loudspeaker to
the system amplifier(s). For all connections, be sure to
observe polarity markings for both channels: Red (+) to Red
(+), and Black (-) to Black (-). All Acoustat Loudspekaers
designed to preserve absolute phase integrity: i.e. when the
red input terminal is positive with respect to the black termi-
nal, the electrostat's diaphragm will move forward.
Standard Connection:
allowsasingle stereo amplifier to power both the electrostatic
array and the woofer. To implement, connect the amplifier's
to the 'ESUSYSTEM INPUT" terminals, and set
output
switch to 'SINGLE AMP". No connection is made
"WOOFER INPUT terminals.
Bi-Wire Connection:
allowsasingle stero amplifier to power both the electrostatic
array and the woofer. but allows use of
to feed each section. To implement, connect the amplifier's
be safely discharged, and disassem-
spacing,
See Figure Four. This configuration
lo
See Figure Five. This configuration
separate cables
two
7
are
the
the
output to the "ESUSYSTEM INPUT" terminals using
one cable, and using another cable, connect the
same amplifier channel's output to the WOOFER
INPUT" terminals. Set the switch to the "BI-AMP/BI-
WIRE" position.
Bi-Amp Connection: See Figure Six. This configura-
tion allows one stereo amplifier to power the electro-
second
static array, and a stereo amplifier
the woofer. To implement, connect one amplifier's
output to the "ESL SYSTEM INPUT terminals, and
connect the second amplifier's output to the "WOOFER
input" terminals. Set the switch to the "BI-AMP/BI-
WIRE" position. The two amplifiers need not be
identical, but should have similar power ratings, and
must have identical gain (sensitivity).
Alternate Bi-Amp Connection: See Figure Seven.
Thisconfiguration allowsone stereo amplifierto power
the left speaker, and a second stereo amplifier to
power the right speaker. The advantage of this set up
is that it allows each power amplifier to be placed
close to the corresponding speaker, avoiding long
speaker cable runs. To implement, connect one
channel of the "left" amplifier to the left speaker's
"ESUSYSTEM INPUT" terminals, and connect the
other channel to the left speaker's WOOFER IN-
PUT". Repeat the process for the right channel. Set
the switch to BI-AMP/BI-WIRE" positiin. The two
amplifiers MUST be identical for this configuration.
Note that the BI-AMP/BI-WIRE switch disconnects
both and woofer terminals from the ESU
(+) (-)
System terminals, avoiding possible problems be-
tween amplifiers due to common connections.
For connections using two amplifiers, a means must
be provided for splitting the signal from the preampli-
fiertoeachamplifier. Somepreampsprovide multiple
outlets; others require the use a "Y" adapter. Consult
your dealer for available options.
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to power