Does anyone know anything about IMAX speakers?

[Woofer]

Hi woof,
I am awaiting the pictures of your catch.
Hope you are happy with the new "stuff".
What brand are the "not JBL" then?
Grtngs;
Johan.

Hello Johan,

They are almost exactly what rlsound suggested, being Eminence speakers, I think. I didn't see any brand names on any drivers except for the TADs. I'll check more closely in the days to come.
So therefore they could be the GT series.
The only difference is that they do not have any passive x-o's between the mids and highs.
Totally active crossed boxes. There is a terminal strip at the back right hand side of the box that connects to the mids and highs, plus two lots of connections for the two pairs of 12".
I'll get some pics in a couple of days. There's just too much work to do, and we're currently experiencing a heat wave for the next WEEK! So no hurry to do anything with them right now. They can stay where they are for a little while.

[SEAWOLF97]

great find Woofer ..congrats

[Woofer]

great find Woofer ..congrats

Heh, heh. Yeh, I'm clapping and patting myself on the head at the same time!

Thanks SEAWOLF'

[rlsound]

The mid range is an 8 inch driver, also eminence. The polarity is reversed on it, make sure positive is going to the negative terminal.

[rlsound]

What kind of subs did you get? If you get a chance to snap some pics I'd appreciate it.

[Woofer]

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......

[Woofer]

Hello there,


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.

Grtngs-Johan.

Johan, (or anyone else for that matter), do you know what the crossover point is for the subs please?

Woofer.

[Jorre Pulle]

Hello to all,
As i said before my sub amplifiers are AB International model 421A (1CH mono) and model 821A (2CH mono).
All the amp-specs can be found on their website and their support is very good.
The active crossovers in the amps have a lot of possible settings.
Bandpass settings are between 20-30hz to 50-80hz,combined with the Oxmoor equalizers one can see the possibilities.
Although i have the Imax 18" woofers (Eminence) I use a JBL 2240H at home.
All depends on the woofer-brand you have now and the enclosure model and tuning freq,i think a bit of experimenting is in order.
I was told that tuning a Imax set up took more than a week,don't know if that is true.
Greetings and have fun.
Johan

[Jorre Pulle]

Hello i quickly took some pics of the 18" Imax woofer,the other picture is just for fun.
Bottom amp is a BGW 750G.
Grtngs-Johan.

[Woofer]

Thank you Johan,
(extra thanks for posting the pics too!)

I have been swamped with my searching out this subject so a link to the exact reference would've been good.

So, I'll be a little more specific.

Does anybody know what was the x-o point used with the IMAX Eminence subs/speakers Theatre installations?
IMAX owned a company called Sonics who built the boxes and contracted out for their amplifiers.
At some time, they used Sonics 800x power amps (which in reality were a re-badged Bryston 7b) for their installs before the AB.
The choice of amplifiers is a bit of a mystery as to what and when they were used. Not even their site elaborates on what was done when.

... and yes, I know I can experiment to my heart's delight, but I would like to add the correct specs to my database for reference.

Anyone? Please?

[yrrab07]

Hi all,
I picked these up last week (literally in the theater) from a local IMAX Theater that upgraded their system. I’m glad I found this thread because there is little to no information available on the web. Four of the same boxes Woofer picked up with three Subs. The sub is an 18” Eminence but anxious to see what Woofer discovers in the large box. He’s probably nursing sore joints and muscles like me because these things are really heavy..
Sub box dimensions - 33” tall, 44” deep and 21” wide

Main box dimensions – 50” tall, 23.5” deep and 30” wide

[Woofer]

Hi all,
I picked these up last week (literally in the theater) from a local IMAX Theater that upgraded their system. I’m glad I found this thread because there is little to no information available on the web. Four of the same boxes Woofer picked up with three Subs. The sub is an 18” Eminence but anxious to see what Woofer discovers in the large box. He’s probably nursing sore joints and muscles like me because these things are really heavy..
Sub box dimensions - 33” tall, 44” deep and 21” wide

Main box dimensions – 50” tall, 23.5” deep and 30” wide

Nice one yrrab'

Welcome to the thread......

As promised, here's some extra home snaps to look at.





... and now for some pics especially for rlsound,

[Lee in Montreal]

but I would like to add the correct specs to my database for reference.

Anyone? Please?

Well, here lies your answer as for the subs. Dipswitches dont' lie. Cut-off and bump.

http://www.audioheritage.org/vbullet...1&d=1363077598

[Woofer]

Well, here lies your answer as for the subs. Dipswitches dont' lie. Cut-off and bump.

http://www.audioheritage.org/vbullet...1&d=1363077598

So that means what? 80Hz?

[Lee in Montreal]

So that means what? 80Hz?

You can probably source the manual for that amp in order to see how the dipswitches are set. That shall tell what the settings are according to the picture.

And a link - http://www.abamps.net/