View Full Version : 2006 fun
05-03-2006, 04:34 PM
Been busy here.
Don't even have an eq on it yet.
05-03-2006, 09:16 PM
Oh man! do you have plans for it? You should really do a write up it's visually stunning and that cabinent design shuld yeild some interesting results, I wonder If switching half of the drivers with PR's would help even out power distribution.
05-04-2006, 01:46 AM
Nice dodecahedron. I remember building one of those out of cardboard in ninth grade geometry class, if only I had thought of putting speakers in it!
05-04-2006, 10:17 AM
> Nice dodecahedron. I remember building one
> of those out of cardboard in ninth grade
> geometry class, if only I had thought of
> putting speakers in it!
Old concept, though I didn't learn of it until after I had built a few.
Back in the 70s a company built full audio range 3-ways in dodecahedrons, there's a company right now putting 2-way coax drivers on all faces in AL enclosures from Japa, and a commercial sound outfit putting a single 8" on the botton, and alternating tweeter and mid on the lower faces for ambient sound in stores and bars. Those are hung from the ceiling.
Mine are subs. The big ones were first. 10 10" drivers and 1000W. 148dB at 72Hz, 139 at 53 Hz in a ~12x12x8 room. We cracked the drywall on one wall and the ceiling. Pictures fell off the walls two rooms away. We bounced the phone out of its cradle on the wall. Moved the 15' countertop half a foot (not screwed down) on the workbench in the next room. Hit the resonant frequency of the ceiling and bounced stuff in cardboard boxes above the ciling 1" off the 1/4" plywood on the 2x4 ceiling joists.
I am Dodecaguy, fear me.
05-04-2006, 10:18 AM
> company right now putting 2-way coax drivers
> on all faces in AL enclosures from Japa,
That would be "Japan"
05-04-2006, 10:27 AM
> Oh man! do you have plans for it? You should
> really do a write up it's visually stunning
> and that cabinent design shuld yeild some
> interesting results, I wonder If switching
> half of the drivers with PR's would help
> even out power distribution.
> Love it!
Ahhh, power distribution?
Not sure what you mean by that.
Acoustic power? It's a spherical array that's below the size needed for a true monopole radiator. Equal power in all directions.
Electrical power? All drivers already get the same power.
Dropping the piston cone area by 9/25 and power from 1000W to 150W loses ~ 12dB spl in a 12x12 room. The EU-700 has pretty much the same response curve as the 11kv2, and the cabs are Q=.7 for both sizes. That room in the current pic is huge though, lucky to get ~100dB at 70Hz (well above F3)
System wasn't designed for killer subwoofer bass, just clean flat response to 30Hz. Need an EQ to lift the freqs below F3 for that.
05-04-2006, 02:45 PM
was what I was wondering about. Thanks for the infor, have you decided on what EQ curve to use?
05-04-2006, 04:19 PM
> was what I was wondering about. Thanks for
> the infor, have you decided on what EQ curve
> to use?
Half of a Linkwitz transform, don't need the pole that cuts the hump due to undersized box.
Basically a parametric to lift the low end plus a high pass to protect the drivers from overexcursion.
10mm xmax on those, no way to hit excursion limits with those plate amps. Limit is the amps clipping.
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