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Old 15th January 2006, 08:30 PM   #171
gpapag is offline gpapag  Greece
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Default "Stoned"

Hi all
Jordan JX92S in QWML box with internal dimensions 225X225X955 mm made out of 15mm thick plywood, internally braced.
All panels loaded with stones, hence the name “stoned”. Fiberglass staffing.
Speaker is firing upwards against a cone diffuser.
Mass loading through a 10mm dia PVC duct. Duct is external, 90 d. angled, 210mm long, with a “Karlson” end opening 350mm long (total length 560mm). Box weights ~ 25kg. Diffuser~15kg
See next
George
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Old 15th January 2006, 08:36 PM   #172
gpapag is offline gpapag  Greece
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(continued)
Intended for listening to classic music, design was bounded by the following requirement:
Speakers to be located in the living room, at two specific room corners (limited foot-print, optically shy, as much non-directional as possible).
See next
George
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Old 15th January 2006, 08:40 PM   #173
gpapag is offline gpapag  Greece
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(continued)
It has ended up sounding balanced, no boxiness at all, bodied, non fatiquing and pleasantly heard from other rooms of the house (two floored). Family-wife and two daughters-fell in love with them (i.e. they tend to use them as well).
See next
George
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Old 15th January 2006, 08:52 PM   #174
gpapag is offline gpapag  Greece
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(continued)
Lower part of Impedance curve. Speaker driven by external amplifier for 2min 15sec. Sample Rate 12000. Sample Size 262144. Repeat Count 5. Smoothing 1/16 Octave
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George
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Old 15th January 2006, 09:01 PM   #175
gpapag is offline gpapag  Greece
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(continued)
Nyquist Plot from above Speakerworkshop Impedance curve data (32000 points) btn. 10Hz and 1500Hz. Only the two main peaks produce resonance circles. The irregularities shown at the Impedance curve at 150, 200 and 1300Hz do not form a circle here, proof they are not due to any resonance.
Regards
George
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Old 16th January 2006, 12:01 AM   #176
soongsc is offline soongsc  Taiwan
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Quote:
Originally posted by gpapag
(continued)
Intended for listening to classic music, design was bounded by the following requirement:
Speakers to be located in the living room, at two specific room corners (limited foot-print, optically shy, as much non-directional as possible).
See next
George

That's the way to go. If you round of the tops of the cones, you will eliminate diffraction significantly.
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Old 16th January 2006, 01:10 PM   #177
gpapag is offline gpapag  Greece
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Default errata

Ref. post #172
Quote:
Mass loading through a 10mm dia PVC duct....
Should read 100mm dia PVC duct.
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George
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Old 16th January 2006, 10:04 PM   #178
Rudolf is offline Rudolf  Germany
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Interesting project George. Those big cones make the speakers look almost like a piece of art. And they are definitely NOT "optically shy".

The only fully documented omnidirectional development for ther JX92 S I know of recommends 90° cones placed as low above the dustcap as mechanically advisable. How did you arrive at those peakish cones? And what kind of filter values did you find to be best?

Thanks
Rudolf
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Old 17th January 2006, 06:26 PM   #179
Fuling is offline Fuling  Sweden
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Here´s a pic of a pair of flosed boxes for FE167E that I´m working on.
I bought the drivers to build a biamped system with open baffles down to about 250Hz and SS8545´s in closed boxes below that.

Though, things didn´t go the way I wanted and I grew tired of the whole thing so I started this project instead.
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Old 18th January 2006, 12:03 AM   #180
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Default another nsb line array

heres my budget attempt at a fullrange ob project. its 3 nsb's per side, wired in series, no crossovers or filters. they sound great at low volume, close range i use them for computer speakers.
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