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of-phase with the direct sound. This can
weaken or even cancel the sound. Keeping
the distance between the subwoofer driver
and any adjacent walls no longer than 1/8
of a wavelength (20 in or 51 cm at 80 Hz)
can minimize interference.
Room resonance is caused by the
reinforcement of certain frequencies
between 20 Hz and 200 Hz, which creates
“standing waves” or room modes. These
resonant frequencies are determined by the
dimensions of the room. The bass response
is sharply boosted for a narrow band
near resonance, and then appears to be
attenuated between resonances.
Corner or Center Placement
Placing the subwoofer in a corner (corner
loading) excites the most room modes in the
room, which tends to smooth the individual
peaks and dips caused by each standing
wave. Moving the subwoofer outward
from the corner along the wall results in
fewer standing waves, but may result in
noticeable peaks at certain frequencies.
Some people prefer to place the
subwoofer between the left and right main
speakers, so that all the sound is coming
from the same plane. Some prefer to use
two subwoofers and place one with the
left speaker and the other with the right
speaker.
Another benefi t of corner placement is
increased effi ciency and lower distortion.
The energy that is refl ected off the walls
115V
BROUGHT TO YOU BY THE GROOVY FOLKS
IN WOODINVILLE, WASHINGTON, USA
©2004 MACKIE DESIGNS, INC.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED PERSONNEL.
AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
RISK OF ELECTRIC SHOCK
DO NOT OPEN
INPUT
SENSITIVITY
POLARITY
OUTPUT
LEFT RIGHT
AC SELECT
SW
•
10 ACTIVE STUDIO SUBWOOFER
ON
~
100-120VAC/220-240VAC
50-6 0 Hz 110W
LR
UNBALANCED
180
O
0
O
MIN MAX
INPUT
LR
UNBALANCED
CROSSOVER
55 110
CROSSOVER
55
8080
11 0
CAUTION: REPLACE WITH THE SAME FUSE AND RATING.
DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE.
~
220-240VAC = T 800 m A L /250V FUSE
~
100-120VAC = T 1.6 A L / 250V FUSE
SERIAL / DATE CODE