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If the frequency balance is not right, try moving the subwoofer slightly to the left or right so that different
room modes are excited at different levels. Positioning the subwoofer close to a corner will boost the bass
level at lower frequencies and may cause asymmetrical spatial imaging. If you are using two subwoofers,
try placing them asymmetrically relative to the side walls. Sometimes moving the subwoofers apart into the
front corners helps with problematic rear wall reflections and the loss of mutual coupling is compensated
by the bass boost caused by corner positioning.
Although the 760A, 770A and 771A subwoofers are magnetically shielded, they may cause some
picture distortion if placed near to very sensitive video monitors or computer displays. Move the subwoofer
further away or try turning the driver side of the subwoofer away from the screen.
Minimum clearances to walls or other objects
The power amplifiers are attached to the lower part of the aluminium grille functioning as a heatsink. Do
not cover the grille or place the subwoofer so that there is less than 10 centimeters (4") of free space in
front of the grille. The space adjacent to the subwoofer must either be ventilated or sufficiently large to
dissipate heat so that the ambient temperature does not rise above 5 degrees Celsius (95°F).
Make sure that the space underneath the subwoofer is clear from obstructions. Thick carpets may block
the ventilation clearance needed for cooling the electronics box. The reflex port side (opposite of the
connector panel side) should always have a clearance of at least 7,5 centimeters (") to any objects to
ensure proper functioning of the reflex port.
Flush mounting the subwoofer
If the subwoofer is flush mounted into a wall or a cabinet, it is important to ensure unrestricted airflow
from the reflex port and amplifier cooling. This can be done by making the recess 7,5 centimeters (")
wider than the subwoofer. Place the subwoofer into the right end of the recess with the driver side facing
the room. This leaves sufficient 7,5 centimeters (") of free space on the reflex port side. The height and
depth of the recess should not be any bigger than those needed to fit the subwoofer flush with the wall
surface.
