Nope, I just googled them...Las Vegas.
http://www.gsany.com/
GSA is from NY, but cabinets and drivers must have been assembled in Québec for a local bar.
And they are definitely not the ones at "Stereo". They had regular 4520s and Berthas with Levan extensions.
http://www.systemsbyshorty.com/sbsstereo1.swf
And found this interesting thread with Shorty himself.
http://www.wavemusic.com/community/s...ad.php?p=45333
On the last pictures, I don't recognize the city, and it's definitely not Montreal!
Unless the mountain vanished....
I noticed the DCX2496 in the other post. It’s a logical choice. I like watching the funky LED’s on mine moving up and down. Have fun with yours.
What are planning to do play Earthquake! You’d piss me off if that was playing below me LOL
The AJ Horn plan and the pictures from the GSA/RLA cabinets make total sense. They found the way to make the path much longer than stock 10' vs 8', even in standard height. Looks like standard 4' height gives you a reasonable 27Hz, while to achieve under 25Hz, the cabinet must definitely be much taller to accomodate a bigger mouth and longer path. I guess I will settle with 27Hz.
Found some interesting reading.
http://www.ibiza-voice.com/media/new...van/sound.html
"The first part of the new system consisted of 4 "Waldorf" bass speakers. First used in a rental at the Waldorf Astoria, it is similar to the JBL double 15" scoop enclosure but is based on the old Jensen Imperial design. The enclosure was made larger to accommodate a larger rear loaded horn, which was designed with a hyperbolic rather than an exponential flare. The high end consisted of the largest JBL horn lens for smooth wide dispersion and the system is electronically crossed over at 80hrz These replaced the corner home-type speakers."
Leading me to that http://www.decware.com/imperial.htm
"High Fidelity Playback - As shown above with special considerations or with a single 15 inch coax, using the 2nd woofer for 50 Hz and below."
Basically, despite the ressemblance with a 4520, the Waldorf, as designed by Richard Long, is an "adapted" Jensen Imperial. I still wonder how they made the cabinet go down in frequency if the tunnel is that short. BTW GSA's cabinets seem to be the same as RLA's as he was transfered the technology after Ricjard Long passed away. From the pictures I posted a bit earlier, the front view shows a deep recess behind the drivers, and the upper "ducts" as on the Jensen Imperial.
[QUOTE=Lee in Montreal;310387Then this summer I will build the 4520s for 18" 2240h drivers. Found a place in the US where they have them for $125 a piece with recent original JBL recones.
Lee[/QUOTE]
You can do other fun stuff with 2240: Diy 80hz mid-bass horn... drums never sounded so good!
I am close to finishing the design of the cabinets. Unlike the Waldorfs which seem to have a large back chamber (which is supposedly good for round bass), I am electing to use a small back chamber to promote compression and efficiency. The goal is to have a tight/fast bass (like a 4530) but down to 30Hz. The cabinet will be 5' tall and 30" deep. Still manageable at home.
According to DB Keele, one of the way to calculate the back chamber in a rear horn loaded bass cabinet is the formula below. It is one of the ways as not everyone seems to agree.
- VB is the back volume (volume of compression chamber)
- ST is the throat area of the horn (590cm2)
- FC is the horn cutoff frequency (30Hz in my case)
- c is the velocity of sound (344m/s)
My calculations tell me I need 0.1076m3 volume. The volume can be reduced by lowering the thoat area, or raising the cut-off frequency.
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