In response to Don's comment - We have known each other for 40 years (graduated from high school together) - He and wife Sandy have been out to visit me in CO a couple of times (most recently we attended RMAF 2013) - If you are ever passing through near State College, PA, I urge you to contact Don and have a listen to his very top-notch system - All primo components - Maybe you'll see me there too :)

ggeers222 April 07, 2014 00:36

'Final photo' change: Instead of the pile of parts used to assemble the thing, I decided a night shot of the completed form looks a lot nicer - And somehow basked in this lighting it sounds even better too :)

ggeers222 April 01, 2014 14:24

Final photo - Perhaps I oughta make kits available (though the labor involved I guarantee might be a turnoff :)

ggeers222 April 01, 2014 01:22

Thanks very much, Albert - You've made my day as well. My wife is a fine arts painter, but I enjoy more creating in 3D; something about the engineering angle of the process. (BTW, I attended RISD during the 70's, and currently work as an engineer for Oracle, so I too understand the transition from art education to a more technologically oriented career!)

ggeers222 March 31, 2014 23:15

Hi Douglas,

The drivers for the "Spiral" speakers are Dayton (Parts Express) 4" long-excursion aluminum-cone 4-ohm full-range units, which seat nicely into the tube ends (which are 10' lengths of 4" corrugated drain pipe sourced from Home Depot)- Hot glue is used as an adhesive/sealant. I also use EQ to balance frequency response, and drive the pair with a Dayton DTA-1 Tripath amp - Usually no one can believe the music that these make :)

Gary

ggeers222 March 30, 2014 23:56

Thanks gents for your compliments... Albert: The concept grew from my ongoing hobby in creating wind-motion sculptures, plus rather unconventional stereo speakers; this project is more or less a melding of the two forms.

2 photos added as examples; a 6-ft wind sculpture (mounted atop an 8-ft pole), and a set of single-driver full-range speakers (each utilizing a 10-ft spiraled tube as the "enclosure" - Bass to 50Hz).

Douglas: Good point re: stereo effect; I'd experimented with L&R wiring, and settled on the top 12 discs playing right channel, and the lower 12 left channel - Believe it or not, even in this vertical orientation a stereophonic presentation is easily heard. I've got the EQ set to cut below 120Hz reaching the transducers in order to prevent a buzzing resonance which would otherwise occur (subwoofer cutoff is set to around 100Hz). Vocals: Beck's new "Morning Phase" release sounds rather nice at a moderate volume level, Enya does pretty well too, but instrumental space/ambient or symphony music certainly sounds best.

ggeers222 March 30, 2014 14:51

One 13mm transducer is adhered to the center of each steel disc, thereby creating 24 separate 12"-diameter flat "drivers"... (All together these can play at a fairly high volume without breakup, but the primary design intent is for background sound levels.)

ggeers222 March 30, 2014 00:54