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Search Result 1
From: Guy Kuo (Guy_Kuo@No_Ham_or_Spam.org)
Subject: Aura Bass Shaker Modification
This is the only article in this thread
View: Original Format
Newsgroups: alt.home-theater.misc
Date: 1999/10/06
I have a pair of Aura Pro Bass Shakers attached to my couch (day bed
actually). The shaking they produce is always a hit with visitors and
vital since my wife hates loud noises and I love LF effects. I can't crank
up my subwoofer, but the shakers keep us both happy. Anyway, they normally
have a peak effect in the low 60's, just a tad too high for best effect.
Some people use bass equalization to tame this peak, I decided to lower
the resonant frequency of the shakers themselves.
The Aura Pro Shakers are easily opened with a #20 torx driver. Once opened
one sees a three legged, plastic, spiral spider which supports the moving
magnet/mass. The voice coil is fixed and on the periphery. The choice was
to either increase the mass or make the spider more compliant. The legs of
the spider are quite stiff, more than actually needed to support the
mass. Since there was little room to add more mass, I trimmed the spiders
thinner, narrower and slightly longer using a Dremel tool and cutter bit.
Took off nearly half the thickness of the spiders and also cut into the
periphery to slightly lengthen them. Obviously this may shorten the shaker
life if too much plastic were taken off, but they are cheap enough to
replace if one goofed. By the way, don't cut too far peripheral or you
might damage the voice coil! The spiders still firmly support the magnet.
Checking with the LFE low frequency sweep in AVIA the shakers now peak at
just under 45 Hz lower instead of about 60. They also now produce output
down to high 20's instead of giving up in the 40's.
I needed to turn down my Shaker amplifier down slightly as they are now
more efficient. The effect is definitely deeper and fuller bodied. After
going through the opening scene in Lost in Space and the helicopter scene
in Matrix, I am convinced my hour of work paid off. Usual caveats apply.
This definitely voids any warranty on the shakers, but they're pretty
inexpensive. Just don't take off too much plastic. How much is too much
has yet to be discovered. I probably took off just over 1/2 of the
spiders' plastic mostly in their thickness and was careful to smoothly
contour all my trimming. Maybe they'll break a bit sooner, but I suspect
they'll do fine. In the mean time, they ARE more fun.
Guy Kuo
www.ovationsw.com -- Home of AVIA Guide to Home Theater
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