36 MartinLogan Exclusives
BalancedForce™ For Cleaner Bass
Resulting from an equal and opposite reaction to the cone's
movement, strong bass causes all traditional subwoofer enclosures
to generate acoustic vibrations. You feel this by touching the
cabinet. Although the "physics" of this phenomenon actually cause
a subwoofer cabinet to resonate or even dance, most subwoofer
designers apply weight or mass to the cabinet to minimize such
disturbances, but still leave one byproduct—"smeared bass".
Vibrations translated from the woofer to the cabinet actually alter
the bass causing a loose and "fuzzy" sound.
This subwoofer uses a BalancedForce bass configuration to
nullify cabinet vibrations. Originally engineered for our cost-no-
object, state-of-the-art Statement™ E2 system, BalancedForce
uses drivers mounted at opposing angles. Your subwoofers drivers,
spaced 180 degrees apart, operate in exact opposition, result-
ing in maximum cancellation delivering the ideal—pure bass
energy with a reduction in cabinet contributions to the room as
high as 25dB over traditional subwoofer resonance solutions!
Proprietary Switching Amplifiers
BalancedForce subs match powerful proprietary switching
amps with incredible woofer drivers resulting in tightly defined
bass while keeping distortion at the lowest possible levels. The
BalancedForce 210 features an 850 watt Class D switching
amplifier capable of a 1700 watt dynamic peak operating at
over 90% efficiency. BalancedForce 212 features dual 850
watt amplifiers (one for each woofer) with a total system power
of 1700 watts (3400 watts dynamic peak).
Low-noise, high-power transformers and switching power sup-
plies feature high-quality MOSFET transistors, noise-suppression
networks, and control circuitry to provide tremendous levels of
current with extremely low levels of distortion. Split power supply
rails minimize distortion while maximizing switching efficiency.
Military grade glass epoxy circuit boards, temperature sensors,
and protection circuitry guarantee quality sound and reliable
trouble-free operation.
25Hz Level Control
25Hz Level control allows custom sound tailoring capability found
in few subwoofers. A room, especially when small, can greatly
exaggerate bass. The 25Hz Level control knob increases or
decreases lower bass to compensate for these room anomalies
and allows increased deep bass if you desire a sense of subsonic
energy at the lowest frequencies.
PBK (Perfect Bass Kit)
Although the controls on your subwoofer allow you to fine tune
and optimize bass performance in your room, PBK allows you
to also correct for the negative effects of the room itself. Even
when a subwoofer is perfectly positioned, the room can have a
dramatic impact on bass performance. Room dimensions, dead
spots, archways, furniture, and countless other factors can turn a
room into an additional instrument playing alongside musicians
or movie scores with unwanted contributions of coloration and
resonance. PBK is sold separately and is strongly recommended.
Optional Custom Low-Pass Filters
Seamless blending between a subwoofer and full-range loud-
speaker is, at the best of times, challenging—and when you're
dealing with the highest levels of loudspeaker performance there
is no room for error. The addition of a custom low-pass filter takes
the headache out of achieving superb low-frequency performance.
Custom low-pass filters are specifically designed to optimize
subwoofer integration by precisely matching the low-frequency roll
off of specific loudspeaker models. Once a custom low-pass filter
is uploaded to a subwoofer, setup is only a matter of adjusting
the phase and level. This custom filter is applied only to the left
and right inputs of your subwoofer. The sub's LFE input remains
unfiltered, which allows surround preamp/processors to send low-
frequency information for the center, surround, and LFE channels
without compromising the performance of your main speakers.
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