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around the woofer, insert your fingers on the sides in this
immediate area and pull out gently. Be especially careful in the
woofer area when pulling the grille away from the enclosure.
If you have removed the grille for any reason and wish to
reinstall it, locate the mounting
slowly press the grille into place. The grille features a self-
aligning, semi-sticky vinyl flap which covers the spacebetween
the baffle board and planar drives. Locate the vinyl flap and
press down on it gently from the front of the grille to make cer-
tain the flap is seated properly around each planar driver. It is
important that the vinyl flap is flush with each planar driver and
covers the gap between the driver and baffle. This will ensure
linear frequency responseand eliminate sonic aberrations which
could be caused by the gap between the baffle board and the
planar drivers.
ROOM
ACOUSTICS,
POSITIONING,
AND TONAL
If you desire a more detailed description of room acoustics and
speaker placement, the following information may prove help-
ful.
Large areas of glass, mirrors, and wood paneling will
reflect sound waves and often result in brittleness
brightness. You can break the sound waves created by hard
surfaces with softer surfaces. Draperies or wall hangings do a
good job in absorbing standing waves created by hard surfaces.
Placing a soft, absorptive piece of furniture near the hard
surface often helps reduce unwanted spurious sound waves. Be
careful
not to absorb too much sound as this will interfere
sonic balance, causing overall sound to be dull and lifeless.
A good listening room has just the right amount of
reflection and absorption. To test the sonic balance of your
room, stand in the location where the speakers will be installed
and clap your hands two or three times. If the room is reverber-
ant, you will hear a sharpnessor echo. If the room is dull, the
sound of the clap will decay rapidly and there will be very little
or no echo. In fact, it will seem that the higher frequencies gen-
erated by the clap will be missing.
Furniture, pictures, bookcases, tables, and lamps will
help reduce reflections because they are located at random
points in the room and this tends to cancel standing waves.
Carpeting or throw rugs also help reduce floor reflections,
although heavy carpeting can absorb a great deal of the higher
frequencies which will make the room seem "bass heavy."
It is customary to place the speakers facing into the long
dimension of the listening room; however, this doesn't always
result in the best sound. At times, placing the speakers facing
into the short dimension of the room will yield better results
due to the acoustic properties of the room and the listener's
position. Experiment with room placement. You may be pleas-
antly surprised at the results.
Maintaining absolute phase is an essential factor in the
proper performanceof your speakers.If all amplifiers (as well
as the other components in the alldio chain) were non-inverting
[if their outputs were always in-phase with their inputs], main-
taining absolute phase would simply involve observation of the
polarities of the speaker connecting wires. However, since there
are amplifiers (as well as preamplifiers and CD players) which
invert the output from the input (see figure I l), some changes
in speaker hookup may be required in order to restore the sys-
tem to absolute phase.
holes on the front baffle and
SPEAKER
BALANCE
and excessive
WVERTWG
POWER
AMPLIFIER
Figure II: Inverting And Non-lnverting Amplifiers
If your amplifier, preamplifier, and CD instruction manuals
do not state if
they are non-inverting since 98% of all audio components do
not invert the audio signal at the output. If you wish to deter-
mine whether or not your components are inverting, contact
with
your dealer, or write to the manufacturer. If you are certain that
your amplifier is an inverting type, it will be necessary to dis-
connect your speakers and reverse polarity (on both speakers)
so that positive becomes negative and negative becomes posi-
tive. See figure 12.
SPEAKER,
REAR
SPEAKER,
REAR
Figure 12: Connecting Inverting And Non-lnverting Amplifiers
POWER
AMPLIFIER
TO SPEAKER
AMPLIFIED OUTPUT SIGNAL,
IN-PHASE
SIGNAL
LOW-LEVEL
TO SPEAKER
AMPLIFIED
OUT-OF-PHASE
TO DERIVE
PLUS (e) TO MINUS
TO PLUS
THIS WILL RESTORE
LOW-LEVEL
SIGNAL
INSTEAD OF NEGATIVE
these audio components are inverting, assume
POWER
AMPLIFIER
INVERTING
POWER
AMPLIFIER
WITH INPUT
OUTPUT
SIGNAL.
180•
WITH INPUT SIGNAL
PROPER
PHASE.
CHANGE
AND MINUS
ON BOTH AMP CHANNELS.
OUTPUT
TO POSmVE
CONNECTION
IS "NORMAL"•
PLUS
TO PLUS
MINUS
TO MINUS
CONNECTION IS BEYERSkQ;
PLUS
TO MINUS
MINUS
TO PLUS (+)
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