All dynamic drivers generate distortion caused by spider
and surround nonlinearities as well as voice coil inductive
disturbances and variant motor strength during massive
woofer excursions. These challenges plague all subwoofer
designers. The result? Induced harmonic and intermodulated
distortions causing dramatic disturbances at high excursions.
This occurs significantly in almost all non-servo-controlled
subwoofers.
MartinLogan’s advanced servo system uses a sophisticated
monitoring and control circuit to detect and instantaneous-
ly correct any deviation between acoustical output and
electrical input. The result? A reduction in distortion for
the purest possible low-frequency reproduction.
The Grotto i incorporates a proprietary switching ampli-
fier that allows for an incredible amount of woofer control
resulting in tighter, better defined bass and while keeping
distortion at the lowest possible levels.
25Hz Level Control
The Grotto i 25Hz Level controls allows custom sound
tailoring capabilities found in few subwoofers. A room,
especially when small, can greatly exaggerate bass in the
20–60Hz range. The Grotto i’s 25Hz Level control knob
increases or decreases lower bass to compensate for these
room anomalies and allows increased deep bass if you
desire a subsonic sense of energy at the lowest frequencies.
18 MartinLogan Exclusives
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Servo-Controlled Dynamic Drivers
Proprietary Switching Amplifier
