OK, so I'm about to pick up a pair of ex-IMAX speakers plus a sub.
Wot I do know, is that they 'may' have (per box), is 4x 2123 (or 2202), 2345, TAD TD-2001, and a 2245 (sub).
Wot I don't know is, what frequencies are these things crossed at, and is the model with the TAD before or after the model that had the 2404?
Also, are these things completely bi-amped or is the TAD passively x-ed?
Any IMAX specialists out there?
Cheers all.
I might be deaf, but I can still hear da bells! (Quasimodo)
.... Oh, and the Kick Drum.
Club double 16"
"Laissez les Bons Temps Rouler"
I thank you for your input Stéphane, but I've read most of that, and maybe it's 'cause it's always been at the end of the day for me, generally in the very early hours of the morning, I may have overlooked the critical info that I'm after.Originally Posted by stephane RAME
Believe me when I say, I've read hundreds of pages on the matter, but the thing that I can't find is the specifics of cross-over points and any time alignment adjustments if at all.
I'm about to pickup a pair of boxes plus a sub which I'm going to use for home stereo duties. Unfortunately there are no electronics with this setup, so I'm trying to figure out what and how it was done.
I do know they used Brooke Sirens crossovers, but none the wiser re: the actual cross-over points used, or whatever other post processing.
Of course I can choose my own, but I'd just like to know how they did it as a reference.
I have the Brooke Sirens (actually 9x FDS 360 x-o's, and a rack of Phase Linear 700's plus a Amcron MA-2401 to handle all the power requirements and a JBL DSC 260 if the BSS don't work out, and Klark Teknik EQ, but what are the suggested x-o points for these speakers?
I'm so exhausted from all the research I've done, and was praying someone with first hand experience with these things might step up, and add their 2 bob's worth.....
Anyway, it's almost 4.30am, and I'm all worn out and off to bed.....
Cheers....
I might be deaf, but I can still hear da bells! (Quasimodo)
.... Oh, and the Kick Drum.
Imax setup
Hello there,
A few years ago I had the chance to obtain all the amplifiers from a Imax setup.
All amplifiers have internal active crossovers (via dip-switches) and are from the AB International company.
Models are:421A and 821A for the subs and model 713A for low,mids and highs.See specs on the AB-site.
Crossover points for the 713A are 800hz and 7khz.
Amplifiers were driven by (6 EA) Deq-1 Oxmoor equalizers.
The subwoofers (8 in total) were Eminence 18" (Omega Pro?) and were a replacement of JBL 18".
The other speakers were hanging on chains so i Couldn't get them to buy.
Hope I could help you a bit with my input.
Grtngs-Johan.
Thank you Johan for your very valued input.
So it would seem that there can be quite a variation regarding amps and speakers.
The ones I'm picking up tomorrow are all JBL components except for the ultra highs. (TAD TD-2001) Apparently the JBL 2104 seems to be the 'normal' driver used instead of the TAD now. (someone feel free to correct me if I'm wrong.)
The amplifiers that were used with this particular setup are the Sonics 800x, but are not available now as they were sold off separately.
(... and yes, for those 'eagle-eyed' amongst you, it is a pic of one 'mirrored' for effect, but I'll post proper pics after I've picked 'em up.)
I might be deaf, but I can still hear da bells! (Quasimodo)
.... Oh, and the Kick Drum.
And how many 2245s did you get?http://www.audioheritage.org/vbullet...1&d=1252530013 http://www.audioheritage.org/vbullet...1&d=1252530038
(sob, sob) ..... just the one.And how many 2245s did you get?
.... so far.
I might be deaf, but I can still hear da bells! (Quasimodo)
.... Oh, and the Kick Drum.
Are you sure there are JBL drivers in those? I'm restoring a set and they use Eminence drivers for the cones and TAD, B&C, or Celestion for the HF.
What kind of subs did you get? If you get a chance to snap some pics I'd appreciate it.
The 18" speakers in the subs appear to be of the same make as the 12" and 8" so I'm guessing they're Eminence too.
The sub boxes are extremely large, probably 4 feet deep or so.
I'll measure up the lot properly eventually and post my findings.
As mentioned previously, pics to follow in a few days.
The whole exercise has been most exhausting so I'm resting for a while......
I might be deaf, but I can still hear da bells! (Quasimodo)
.... Oh, and the Kick Drum.
Johan, (or anyone else for that matter), do you know what the crossover point is for the subs please?
Woofer.
I might be deaf, but I can still hear da bells! (Quasimodo)
.... Oh, and the Kick Drum.
The Munich IMAX seemed to use stock JBL components.
Only the 2404s they used had been modified. They had a long pipe between motor and horn to get the "acoustical centers" of the different speakers into one plane.
Are You sure that the stuff You are going to buy is IMAX stuff?
A discotheque comes two my mind, where a "helpful technician" had diagnosed the 2405s as defect, and had swapped them for little money against piezos. He took the 2405s home, of course.
ruediger
Yes Ruediger, it is definitely IMAX.
They were all pulled from an IMAX theatre. (along with at least another 4 boxes, which makes it a total of six, which is a standard IMAX setup.
(left rear, left front, centre, one flown above centre, right front, right rear, and a special room that's tuned like a giant bass enclosure with 8 subs in it installed below the centre box.)
I have seen an IMAX box from various sources on the 'net and they compare favourably with the above photo.
There seems to be up to three different versions from what I've found so far, but the one thing they all have in common, is the actual box, (and the horns.)
The drivers can vary, but the basic box is the same throughout....
In another 12 hours, I'll know more.... (and I'm counting the minutes.)
I might be deaf, but I can still hear da bells! (Quasimodo)
.... Oh, and the Kick Drum.
The references you have read about JBL and IMAX are referring to the older systems that used four way clusters. These speakers you and i have are a very different beast. There are two different models, the SR (which is only the horns) and the GT, which is the model you have purchased. All IMAX theaters from 1998 until 2004 used these until the MPX line was developed. Aside from the four way JBL stack, the GT speakers are the best they have.
The do use a passive crossover for the high-mid, but the woofers are powered separately making it biamped
That bit of info is 'gold', as I'm about to leave in an hour or so to do the deal....
The current owner has been anything but forthright with info about this lot, and I've spent countless hours sifting through search results.
At least now, after everybody's input, I'll be able to make a final decision on these things once I'm there.
The offer currently stands at AU$2500 for the two boxes plus one sub.
At least these have the TAD TD-2001 which can sell for up to $2500 on their own, so the overall deal still looks worthy, but I'm still none the wiser as to what the other compression driver is or even what the sub is for that matter, but I'll know soon enough.
Thanks heaps once again.....
I might be deaf, but I can still hear da bells! (Quasimodo)
.... Oh, and the Kick Drum.
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