Six Perspectives On A Chaotic Resonator

Hello All,

We’ve got an art show coming up in North Adams, MA.  Both Paul and I were asked by our friend Ven Voisey to submit something to a group show at Gallery 51 on Main Street.  The show is called ‘The Amazing Acoustaphotophonogrammitron’ and features work that bridges sound and image in some way.  Here’s the poster:

I’m putting in a device that I invented about 1 1/2 years ago, sort of a poor man’s laser show…  here’s what it looks like:

It’s made from poplar and has 6 Green Lasers (532nm) mounted on goosenecks (right) that are focused on 2 carefully cut flexible mirrors, that are, in-turn, attached to miniature subwoofers, powered by a cd player through a small amplifier (not shown). 

The Lasers:

I got the green lasers by cutting them out of laser pointers that I bought from an online wholesaler.  I cut off the back part of each laser pointer with a pipe cutter and replaced the batteries with a 3 volt ac/dc wall plug via alligator clips.  They are amazingly efficient light sources, tremendously bright and tireless, I’ve run them for weeks at a time with no apparent change to their output!  The goosenecks we’re salvaged off of a cheap floor lamp that I bought at the ‘Voldemart’. 

The Mirrors:

I got the mirrors at an autoparts store as a cuttable sheet designed to replace broken sideviews.  The flexibility is important for the projection to work properly… The mirrors are mounted to four inch speakers using copper fittings from the plumbing aisle. (mini subwoofers are best since they offer maximum displacement).  Sounds are played through the speakers causing them to vibrate and the lasers are redirected by the vibration of the mirrors and projected against the wall to create some astonishingly beautiful patterns (via persistence of vision):

Simple sine waves produce lines/circles/ovals/eights.  Combinations of sine waves produce more complicated gyroscopic effects, that often oscillate in bizarre ways if the higher frequency is near an overtone of the root frequency.  Careful tuning and detuning of related frequencies gives you quite a bit of control over what the pictures do.  More complicate acoustic noises (eg guitar or voice) give pretty chaotic noisy looking tangles.  In this case, it’s in stereo, so more combinations are possible.

The odd shape of the mirrors ensures that no two frequencies will have exactly the same effect since the standing waves are contained in a fairly chaotic (non-resonant) space.  The displacement in the x and y axis for any given frequency is unpredictable, but completely repeatable.  So by sending a frequency sweep through the system you can quickly get an idea of where the interesting images lie and save them for use in a composition.  This is probably sounding a little complicated and long winded at this point, but it’s really fun stuff  (if your a geek).  Anyway, it will be on display through the equinox so you can see it for yourself, and if you have questions, email me.  I’m also hoping to turn it into a stage piece for our live show this year, after the new record is out. 

Thanks! and congrats if you’ve made it this far.  Stay Warm!   

Nick

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About zammuto

of the band 'The Books' and 'Zammuto' zammutosound.com
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