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MartinLogan Descent [15/20] Descent advantages

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 phe-

nomenon 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 by product—"smeared bass". Vibrations translated

from the woofer to the cabinet actually dampen the bass

signal causing a loose and "fuzzy" sound.

The Descent integrates BalancedForce bass configuration

to nullify cabinet vibrations. Originally engineered for the

cost-no-object, state-of-the-art Statement™ E2 system,

BalancedForce uses two or more drivers mounted at oppos-

ing angles. The Descent's 3 drivers, spaced 120 degrees

apart, operate in exact opposition, resulting 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!

Servo-Controlled Dynamic Drivers

All dynamic drivers generate distortion caused by spider and

surround nonlinearities as well as voice coil inductive distur-

bances 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.

To dramatically reduce these phenomena the Descent utilizes

servo monitoring and control via an advanced circuit that

corrects for any acoustic deviation from the pure audio sig-

nal, resulting in a 3-to 10-fold distortion reduction (depending

on SPL) over traditional dynamic driver technologies.

The Descent's 40 and 70Hz filters achieve extremely pre-

cise crossover points in both amplitude and time domain

resulting in seamless blending with both MartinLogan and

non-MartinLogan products (40Hz setting for floor standing

speakers—70Hz setting for bookshelf and/or effects type

speakers). By tailoring custom filters to the main speaker

roll-off characteristics, minimum group delay results in

cohesive integration and musical results.

Proprietary Switching Amplifier

The Descent uses a recently developed class of switching

amplifier rated at a true 400 watt RMS (800 watt peak)

with a total harmonic distortion of 0.07% at all levels. This

amplifier uses much higher switching frequencies and new

techniques over typical subwoofer amplifiers to keep noise,

distortion and thermal energy at the lowest possible levels.

25Hz Level Control

The Descent 25Hz level control allows custom sound tailor-

ing capabilities found in few subwoofers. A room, especially

when small, can greatly exaggerate bass in the 20–30Hz

range. The Descent’s 25Hz level control knob increases or

decreases lower bass to compensate for these room anom-

alies. The 25Hz level also allows increased deep bass if you

desire a subsonic sense of energy at the lowest frequencies.

DESCENT ADVANTAGES

Descent Advantages 15

BalancedForce™ For Cleaner Bass Low-Pass Filters Maximize Blending

MartinLogan Descent [15/20] Descent advantages

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