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The Auralex SubDude(HD) is a 15" x 15" x 2.5" platform wrapped with
a cleanable black velour to fit any room setting. Its purpose is to
prevent sound from transmitting through your subwoofer to surrounding
surfaces.
Subwoofers create big vibrations (low frequencies) that you can feel
in the floor and in objects placed nearby. When the source of the
vibrations is coupled directly to the floor it causes these objects to
vibrate or resonate – not only at the fundamental pitch the source is
creating but also at harmonic frequencies that discolor the true sound
from the source. Now you have two (or more) objects vibrating, which
creates an acoustical problem called "secondary resonance".
Note the graph of
SubDude performance on a sample concrete floor, the most noticeable
effect is on harmonic frequencies above 100 Hz. This is the harmonic
range above the fundamental the sub is recreating, allowing you to hear
a more true bass tone below 100 Hz by eliminating upper harmonic
resonances. This translates to the listener as more accuracy in the low
end, and a cleaner (less muddy) crossover between the sub and your full
range LCR channels. The SubDude effectively reduces secondary resonance
by decoupling your subwoofer from the floor so you hear your sub and
not the vibration of the other objects in your listening environment.
When speakers are tested in anechoic chambers, they are isolated
from objects around them that could introduce resonance. With the
SubDude, you can recreate a similar scenario in your living room.
Impact STL
(Sound Transmission Loss) is a decibel reduction based on the vibration
component of sound transmission. This test was estimated – a partial
area of the test chamber’s floor was floated using PlatFoam to mimic
real world conditions. Not in strict compliance with ASTM E492.
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