I
Power
Input
The miniature (3.5 mm) phone jack connects to the ul-
trasonic bias power supply, which creates the
+5000
volts necessary for electrostatic operation. The
supplied wall transformer
is
to be connected to this
input jack arid plugged into an ALWAYS ON line
outlet. Make sure that there are
no
wall switches or
light
dimmers associated withtheoutlet.
All
Acoustat
loudspeakers are intended to be left on
at
all times
lo
maintain full charge: power consumption
is minimal
(about as much as a small night light).
NOTE:
Before plugging in thewalltransformer, make
sure that it is rated for your
local line (mains) voltage.
The
export transformer, labelled for 220 volts,
is
suitable for use with 220 to 240 volts, 50 to
60
Hz.
High Frequency
Contour
Switch
A
three position switch has been provided on the rear
of the interface chassis to adjust the top-octave re-
sponse. Most situations
will
call for the "medium"
setting. However, there
is
no
"correct" setting: adjust
this switch to suit your own preferences. Each step
of the switch causes a change of about 2 dB at 20 kHz.
1
Spiked feet
Four spiked feet have been included for installation
on each speaker. The feet serve to firmly couple the
speaker to the floor, yielding more solid bass re-
sponse. The feet can also be
used
to level the
speaker,
as well as to "bite" through deep pile carpet-
ing to better stabilize the speaker.
The speakers
should
be set-up in their final listening
positions before installing the spiked feet, as moving
the speaker with the spikes installed can be more
difficult. Never drag the speaker across the
floor
with
the spikes installed. To install, simply screw eachfoot
into the receptacle located on the bottom of the
woofer cabinet. Insert the threads fully unless the feet are
being used to level the speaker, in whch case
one
or more
feet can be
backed-out
to even the speaker on the floor.
The use of spikedfeeton non-carpeted floors isgenerally not
recommended due to
the
high chance
of
scratching or dent-
ing the floor. It is possible to level the speaker on non-
carpeted flloors by substituting a hex- head
1/4"-20x 1" bolt for
the spiked foot. available from hardware stores.
THE
LISTENING
ENVIRONMENT
I
Room Size
The Spectra
1100is best suited to small to medium rooms:
those with minimum dimensions of 12 to 18 feet (3.5 to 5.5 me-
ters). Quite acceptable performance will be obtained in larger
rooms,
but
with a slight
loss of total volume capabiliiy.
Some
of
the principalconsideratiins which willdetermine the
performance potential of the speaker system
as
installed are
listed below. Remember, these are general guidelines only.
Room shape,
furniture
type, and personal taste are all impor-
tant variables. Every listening environment
is
different, and
experimentation
is
the key to satisfaction.
The Wall Behind
The Speakers:
The walls should be neither
excessively absorptive nor reflective.
A
highly reflective wall,
such as large
glass
windows or smooth hard plaster, will tend
to accentuate high frequencies. A highly absorptive wall such
as
heavy drapes or excessive application of specific sound
absorbing materials, will tend to muffle high frequencies, as
well as constrict the apparent depth of the sound stage. The
High Frequency Contour switch can help to compensate for
some of these variables.
The Orientation Of The Speaker System Within
The Room:
For deepest low bass performance, the speakers should
project sound along the longer axis of the
room. This is true
of all loudspeakers, and
is in
no
way unique to Spectra.
If
this
is not possible in your room, the performance
will
not be
significantly compromised other than a slight
loss
of deep
bass.
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