We used a Clark Synthesis unit in some Disney attractions that actually
had a "tactile" frequency response up to 800 Hz.=20
Flat is problematic with these kinds of things, of course. With
speakers, the medium is air, whose acoustic impedance over frequency is
fairly well studied with consistent if complex properties. With these
kinds of devices, we're activating mechanical systems with resonances
that are unique to each individual chair/floor/wall we're shaking.
Never could get anyone to pay for using mechanical modeling software to
model the chairs and floors, etc. to help us understand the best
mounting design for coupling the vibration.=20
Clark's shakers were originally designed for use in drummer's thrones as
part of the monitor system, but they worked well for making surfaces
"thrum" with the audio soundtrack.
From: Greg Weddig
Sent: Friday, July 30, 2004 12:55 PM
Subject: Re: [Nature Recordists] Audio Monitors for Editing (bass
> From: "Greg Weddig" <>
> > I have one of these that we demo'd for a project at work they are
> > cool but in my opinion, not very good in a monitoring situation.
Then Walter Knapp wrote:
> Is this because of the sound quality, or just because infrasound is
> something commonly found in music?
> I'm not interested in toys. I'm looking at a neglected area of
> sound, and want as good as I can get.
Walt it's mostly because in most of my recording I'm trying to get rid
of the low frequency information, most of the audio production is not
traditional music so at this point anyway I don't have a real need for
a subwoofer. Though it works great in a planetarium seat (which is
what I have the demo unit for).
The specs on the bass shaker I have imply a 10hz>80hz range, pretty
typical for a subwoofer. The problem with the bass shacker as I see
it is that it doesn't really work well unless you mount it to
something, and then it picks up the resonant frequency of whatever
you've mounted it to. Doesn't provide a flat frequency response that
one tries to attain in loudspeakers. In my opinion it's much more
effective at providing a boom than reproducing the subtleties of
Of course I would recommend getting a pair and finding out for
yourself, check ebay for bass shaker. They are pretty affordable if
you have a spare amp. And they are pretty fun to play with on
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
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