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Oh no. I did it. JBL 4520 related
Will be renting a van next week to pick-up a pair of 4520. Current owner has 8 of them. He keeps 4 to himself and I get a pair. One pair up for grab, Eaulive...
They are empty and dirt cheap. Only catch is that they were painted white as they got rented for a movie that pictured the early 1980s disco era. Movie is called "Funkytown". I will load the 4520s with the 2225h I already have.
They can be seen here.
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If You insist on scoops ...
Quote:
Originally Posted by
Lee in Montreal
Because the Superscooper is a modified 4530 (single driver) and I am using two drivers per enclosure (4520).The 4520 and 4530 sound very differently. One is a kick bin (4530) while the other goes deeper (4520).
The Superscooper has a 2.22m pathway, while the 4520 I redesigned has 2.57m, and a lot more volume. Longer pathway and extra volume = deeper bass.
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1.) You may scale the 4530 linearly by multiplying height and depth coordinates with a constant factor.
2.) Why not build 4 single scoops instead of 2 double scoops? Would be easier to transport.
3.) Have a look at
http://www.audioheritage.org/vbullet...500&viewfull=1
ruediger
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Old article with plots of exponential vs. hyperbolic horns and of short horns
Found an old article in two parts. Part 1 contains the plots which I meant.
See page 2 in part 1. The exponential horn and the hyperbolic horn have no useful radiation resistance at "cutoff". Above cutoff the hyperbolic horn has a high resistance, and the exponential horn has a low resistance.
See page 4 in part 1. The locations of the resonance peaks are determined by horn length. The magnitude of the peaks is determined by horn mouth area.
ruediger
Good catch - the Zanzibar model has a smaller chamber.
Looks like they were selling the prototypes and making improvements as they went. There is a guy on this forum that built the Studio 54 models. I asked him for the plans.
Here is the catalog info:
The Waldorf
tri-amplified speaker system featuring a front radiating, rear horn-loaded bass unit with two 15" bass drivers and two 15" mass-loaded passive radiators. The mid-range consists of a JBL horn lens coupled to a 2" compression driver while a gauss tweeter handles the high-end.
The Waldorf is also designed for use with the RLA X-6000 electronic crossover so that linear phasing can be obtained through the use of the special time-delay circuit. The Waldorf is also available in a bi-amp version and can be purchased with various compression driver/bass driver combinations. Designed for vertical or horizontal applications.
DIMENSIONS: 61.5"H x 36"W x 30"D (74" high with horn).
WEIGHT: 385 lbs.
Funny thing about sound installers is that, many times no one has trained ears like they do. They have to make changes to fit a particular venue. I read an article about Zanzibar some time ago that it has some particular challenge due to the size (seems like a low ceiling in one part) and that Richard had to make do. Sounds like they had a few options for the 15". I can't tell from the size of the GSA cabinets if they are 15 or 18, have you asked him?
Mike
Quote:
Originally Posted by
Lee in Montreal
I am still holding on it. The drafts are done for twin 18" drivers. Progresion curve is nice but I am a bit puzzled by how short the horn is as it is tuned to 40Hz with a mouth that is able to handle much lower. I still have to make a sonic modeling thru winsrep.
Interestingly, it seems there are/were two variations of the Waldorf.
RLA from the Empire roller rink
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RLA from Club Zanzibar
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If you wish to contribute to this project, then simply help with whatever insight you may have. BTW Drivers would be 2240h (fs30) for effortless oomph under 50Hz.