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post #1 of 61 Old 01-09-2010, 04:01 PM - Thread Starter
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what kind of subs or frequencies do they run?
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post #2 of 61 Old 01-09-2010, 04:13 PM
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http://www.in70mm.com/newsletter/199...ound/index.htm
http://history.sandiego.edu/gen/filmnotes/imax.html
You can check those out to see how the sound works. This comes up now and then when really impresive movies are out. If you search I am sure you will find some other info as well here.

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post #3 of 61 Old 01-09-2010, 06:25 PM
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Quote:
Originally Posted by oikos View Post

what kind of subs or frequencies do they run?

Here is a link to 1 IMAX that has a Danley system in it (Mains and subs)

http://blog.svconline.com/briefingro...ma-experience/

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post #4 of 61 Old 01-09-2010, 07:36 PM
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The two IMAX theaters near myself are located in Jordan's furniture stores. I was extremely impressed with the tactile sensation of the bass until I realized that these theaters employed Buttkickers (1 for every three seats). While I was still impressed this leads me to believe that their subs weren't as scary as I had imagined. It also pushed me to install some tactile transduction in my own theater.

Really? "Subwoofer" isn't in the AVSForum spell checker?

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post #5 of 61 Old 01-09-2010, 08:09 PM
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From what I understand their subs only extend to about 20Hz.

But having Buttkickers would have the same net effect below that. I wish the Imax theaters near me had them.

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post #6 of 61 Old 01-10-2010, 03:50 AM
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The new smaller digital IMAX locations showing up in multiplexes are using Eminence drivers in the subs. The location I work at has 4 cabinets coupled together with 4 Eminence drivers. The subs are driven with a Yorkville amp each pair receives roughly 3000 watts.
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post #7 of 61 Old 01-10-2010, 08:25 PM
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Quote:
Originally Posted by jpmst3 View Post


But having Buttkickers would have the same net effect below that. (

No pun intended, eh?
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post #8 of 61 Old 01-10-2010, 08:32 PM - Thread Starter
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Quote:
Originally Posted by Ivan Beaver View Post

Here is a link to 1 IMAX that has a Danley system in it (Mains and subs)

http://blog.svconline.com/briefingro...ma-experience/

"The TH-50 actually challenged the sample rate of the FFT analyzer being used in the final testing in that due to the combination of cabinets and room gain we are flat to 10Hz!"

OMG! 10HZ
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post #9 of 61 Old 01-11-2010, 10:05 AM
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Quote:
Originally Posted by jpmst3 View Post

From what I understand their subs only extend to about 20Hz.

But having Buttkickers would have the same net effect below that. I wish the Imax theaters near me had them.

Missed it by an octave....the Imax standard reference is -3dB@40Hz!
During the commissioning of the OMNIMAX project in Chicago, the Dolby folks spent considerable time trying to figure out what was wrong with their analyzers. The issue was they were measuring flat to 20Hz and when they brought that apparent error up to the contractor Tim Olgletree of Media Merge, Tim said welcome to Danley!


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post #10 of 61 Old 01-11-2010, 01:37 PM
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Originally Posted by Mike Hedden View Post

Missed it by an octave....the Imax standard reference is -3dB@40Hz!
During the commissioning of the OMNIMAX project in Chicago, the Dolby folks spent considerable time trying to figure out what was wrong with their analyzers. The issue was they were measuring flat to 20Hz and when they brought that apparent error up to the contractor Tim Olgletree of Media Merge, Tim said welcome to Danley!


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Danley Sound Labs, Inc.

Nice!

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post #11 of 61 Old 08-10-2012, 11:08 AM
 
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Quote:
Originally Posted by jpmst3 View Post

From what I understand their subs only extend to about 20Hz.


But having Buttkickers would have the same net effect below that. I wish the Imax theaters near me had them.

Only extend down to 20hz.
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post #12 of 61 Old 08-10-2012, 11:10 AM
 
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Quote:
Originally Posted by oikos View Post

"The TH-50 actually challenged the sample rate of the FFT analyzer being used in the final testing in that due to the combination of cabinets and room gain we are flat to 10Hz!"


OMG! 10HZ

I doubt that very many people are subjected to 10 hz content at their local theaters and probably never will. All kinds of lawsuit could arise against theater chains of that was going, especially in this litigious society.
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post #13 of 61 Old 08-10-2012, 11:12 AM
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Originally Posted by Auditor55 View Post

I doubt that very many people are subjected to 10 hz content at their local theaters and probably never will. All kinds of lawsuit could arise against theater chains of that was going, especially in this litigious society.

LOL at bumping a two year old thread to take another dig at ULF bass.

You're a riot.
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post #14 of 61 Old 08-10-2012, 11:18 AM
 
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Originally Posted by Matt34 View Post

LOL at bumping a two year old thread to take another dig at ULF bass.
You're a riot.

Well, we are always told to do a forum search before starting a new thread. Would you have me start a new thread convering this same topic? If I did, I would still be considered a troll by you.smile.gif
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post #15 of 61 Old 08-10-2012, 12:01 PM
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Quote:
Originally Posted by Auditor55 View Post

Quote:
Originally Posted by Matt34 View Post

LOL at bumping a two year old thread to take another dig at ULF bass.
You're a riot.

Well, we are always told to do a forum search before starting a new thread. Would you have me start a new thread convering this same topic? If I did, I would still be considered a troll by you.smile.gif

I don't think many people "consider" you a troll. We can hear you a mile away. No badass amp or speakers needed.

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post #16 of 61 Old 08-10-2012, 12:16 PM
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Quote:
Originally Posted by Auditor55 View Post

I doubt that very many people are subjected to 10 hz content at their local theaters and probably never will. All kinds of lawsuit could arise against theater chains of that was going, especially in this litigious society.

rolleyes.gif
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post #17 of 61 Old 08-11-2012, 12:03 PM
 
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Why the Ad hominem attacks.

Why not deal with the subject at hand. I wonder why why most commericial theaters, includinging IMAX, that have subs that "only" go down to 20hz? There's is a reason for that which haven't been explained in this thread.
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post #18 of 61 Old 08-11-2012, 12:21 PM
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Quote:
Originally Posted by Auditor55 View Post

Why the Ad hominem attacks.
Why not deal with the subject at hand. I wonder why why most commericial theaters, includinging IMAX, that have subs that "only" go down to 20hz? There's is a reason for that which haven't been explained in this thread.

1.) Would cost a small fortune to pressurize a room the size of your normal theater.

2.) Sound/ structural noise bleeding over to neighboring screening rooms.
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post #19 of 61 Old 08-11-2012, 01:52 PM
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Quote:
Originally Posted by Auditor55 View Post

Why the Ad hominem attacks.
Why not deal with the subject at hand. I wonder why why most commericial theaters, includinging IMAX, that have subs that "only" go down to 20hz? There's is a reason for that which haven't been explained in this thread.

Because it would be very expensive for these large spaces, and most Americans are not bass heads. That said with more and more movies being made with ULF content, we may see more theaters that can extend with authority under 20hz pop up.

I know I would pay a little more to get better sound when I go to the theater.

You crack me up about the lawsuits. I suppose you think people should sue the theater if they get a headache from 3D?
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post #20 of 61 Old 08-11-2012, 03:39 PM
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Quote:
Originally Posted by Auditor55 View Post

I doubt that very many people are subjected to 10 hz content at their local theaters and probably never will. All kinds of lawsuit could arise against theater chains of that was going, especially in this litigious society.
I realize people can sue anybody for anything, but on what grounds would someone sue a theater if they were subjected to 10 Hz content? Temporary nausea? rolleyes.gif

I suppose if someone experienced a "brown note" during that content, the rest of the theater patrons could sue for pain and suffering. biggrin.gifbiggrin.gifbiggrin.gif

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post #21 of 61 Old 08-11-2012, 06:00 PM
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I suppose if someone experienced a "brown note" during that content, the rest of the theater patrons could sue for pain and suffering. biggrin.gifbiggrin.gif :DCraig

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post #22 of 61 Old 08-11-2012, 08:36 PM
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Quote:
Originally Posted by Auditor55 View Post

Why the Ad hominem attacks.
Why not deal with the subject at hand. I wonder why why most commericial theaters, includinging IMAX, that have subs that "only" go down to 20hz? There's is a reason for that which haven't been explained in this thread.

Here you are once again trying to find some excuse to bolster your opinion about sub-20Hz content, when all it does is demonstrate that you are ignorant about the practical realities as mentioned by Matt34. And you wonder why people make ad hominem attacks against you.
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post #23 of 61 Old 08-12-2012, 09:10 AM
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On another unrelated note, the Danley TH 50 no longer exists on their website. Did it get replaced by a different model?

If one is going to make a simplistic assessment of the value of different alignments, it would be that sealed/IB goes the lowest, at the highest cost per dB; horns have the lowest cost per dB at the expense of size, and vented box characteristics lie in between the other two. None is inherently superior across the board, neither is any inherently inferior across the board. The one to use is the one that fits your response and output needs, available space and bank account. -BFM
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post #24 of 61 Old 08-12-2012, 01:46 PM
 
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Quote:
Originally Posted by Matt34 View Post

1.) Would cost a small fortune to pressurize a room the size of your normal theater.
2.) Sound/ structural noise bleeding over to neighboring screening rooms.

Good points.
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post #25 of 61 Old 08-12-2012, 01:48 PM
 
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Originally Posted by jchong View Post

Here you are once again trying to find some excuse to bolster your opinion about sub-20Hz content, when all it does is demonstrate that you are ignorant about the practical realities as mentioned by Matt34. And you wonder why people make ad hominem attacks against you.

I don't wonder why people make ad hominem attacks against me, I know why they do it. They do it for the same reason most people use ad hominen attacks, they can't handle the truth of the subject matter, so they attack the messenger instead of the message.
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post #26 of 61 Old 08-12-2012, 01:59 PM
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Quote:
Originally Posted by Auditor55 View Post

Quote:
Originally Posted by jchong View Post

Here you are once again trying to find some excuse to bolster your opinion about sub-20Hz content, when all it does is demonstrate that you are ignorant about the practical realities as mentioned by Matt34. And you wonder why people make ad hominem attacks against you.

I don't wonder why people make ad hominem attacks against me, I know why they do it. They do it for the same reason most people use ad hominen attacks, they can't handle the truth of the subject matter, so they attack the messenger instead of the message.

"To be honest, I really don't even think about, not at all. At over 8,000 post and counting, I don't think about it all."

Just thought I would throw that in there. Smdh. That is you BTW. Lol.

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post #27 of 61 Old 08-13-2012, 04:20 AM
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Quote:
Originally Posted by Auditor55 View Post

I don't wonder why people make ad hominem attacks against me, I know why they do it. They do it for the same reason most people use ad hominen attacks, they can't handle the truth of the subject matter, so they attack the messenger instead of the message.

When the messenger keeps repeating certain messages, in spite of arguments to the contrary or without knowing the full facts behind things, then that demonstrates a certain level of thick-headedness. The messenger thinks he knows the truth of the subject matter when in fact he doesn't. In such cases the messenger deserves what he gets.
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post #28 of 61 Old 08-13-2012, 12:13 PM
 
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Originally Posted by jchong View Post

When the messenger keeps repeating certain messages, in spite of arguments to the contrary or without knowing the full facts behind things, then that demonstrates a certain level of thick-headedness. The messenger thinks he knows the truth of the subject matter when in fact he doesn't. In such cases the messenger deserves what he gets.

Show me in the forum rules where any kind of personal attacks, for whatever reason, are allowed.
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post #29 of 61 Old 08-13-2012, 12:17 PM
 
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Also, if they are facts to be considered, please share them. I have yet to read where this forum doesn't allow facts be shared.
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post #30 of 61 Old 08-13-2012, 03:46 PM
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Fact, the LFE channel of a dolby system is 3-120 hz. Many movies contain ULFs. Big commercial theaters are about making money, not meeting specs. The best theaters I have been to are the ones that at least try to meet certain specs, like THX theaters. If you have not experienced a full bandwidth theater at reference then you don't know the difference. If you have and feel like it is not worth it then that is fine, but that is opinion and not fact.
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