The Auralex AmpDude is a 15" x 15" x 2.5" platform wrapped with
ozite 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
AmpDude 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 AmpDude 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
When speakers are tested in anechoic chambers, they are isolated
from objects around them that could introduce resonance. With the
AmpDude, 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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