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7 x RE Audio XXX 18" subs, Infinite Baffle Sub, Ultimate IB build - Page 14

post #391 of 540
Thread Starter 
Sigh... The wife has already started complaining about the theater. I finally got the EQ done (The initial stage that is)

Me: Is it too loud?
Wife: It not that it is too loud, I feel nauseous and the windows are shaking. And it annoys me.
Me: But it is not too loud , right?
Wife: No, but I don't like what I am feeling! Turn it down!!!

Looks like I am going to be double dooring the theater room and the doors leading down into the theater, b/c that is where the sound is leaking.

And who ever said tactile base was for raised floors has not experienced this room.
post #392 of 540
too funny, my wife complains all the time too from my f20s- everyone else thinks its awesome.
post #393 of 540
Follow up to my post in your thread on the Cult" forum

http://www.lowertheboom.org/trice/infrasound.htm
Quote:
12 Cycles Per Second (Hz) - Walt Disney and his artists accidentally experienced infrasound on one occasion. A cartoon sound effect was slowed from 60 cycles per second to 12 cycles per second via a tape-editing machine and was amplified through the theater system. The resulting tone, though brief in duration, produced in the entire crowd nausea that lingered for several days.
post #394 of 540
Pardon my bluntness, but that reeks of an urban legend / myth. Commercial theaters don't have the audio setup to produce high output subsonic frequencies, especially not ones decades ago.
post #395 of 540
Quote:
43 - 73 Cycles Per Second (Hz) - lack of visual acuity, IQ scores fall to 77% of normal, distortion of spatial orientation, poor muscular coordination, loss of equilibrium, slurred speech, and blackout.


Awesome. This lunacy has spilled over into the DIY subforum now. rolleyes.gif
post #396 of 540
Yeah that stuff is crap. Everyone leaves my room smiling.
post #397 of 540
Just make sure everything is secure in your home Dave, I have knocked picture frames off the wall and that doesn't go over well at all. There was one room in a house I had awhile ago that really shook violently from the bass, it was an experience to be sure smile.gif
post #398 of 540
Thread Starter 
Quote:
Originally Posted by Thomas-W View Post

Follow up to my post in your thread on the Cult" forum
http://www.lowertheboom.org/trice/infrasound.htm
More sound proofing to the rescue. As I said , I will be putting 3 more doors in separate places to stop the sound traveling up into the rest of the house. Cheers.
Quote:
Originally Posted by mjaudio View Post

Just make sure everything is secure in your home Dave, I have knocked picture frames off the wall and that doesn't go over well at all. There was one room in a house I had awhile ago that really shook violently from the bass, it was an experience to be sure smile.gif

LOL, if that happened to me, I would be out on my ass! LOL biggrin.gif
post #399 of 540
Quote:
Originally Posted by Stereodude View Post

Pardon my bluntness, but that reeks of an urban legend / myth. Commercial theaters don't have the audio setup to produce high output subsonic frequencies, especially not ones decades ago.
This was no ordinary theater it was the one being used to create the 9 channel mix for the original version of Fantasia.

Nonbelievers should spend a little time with Bruce Thigpen's rotary sub. When he tested it at the RMAF, people were exiting the room with C/O's nausea/vertigo, I was present at that demo and watched people leave with the complaints
post #400 of 540
Quote:
Originally Posted by Thomas-W View Post

Follow up to my post in your thread on the Cult" forum
http://www.lowertheboom.org/trice/infrasound.htm

This is my favorite:

1 - 10 Cycles Per Second (Hz) - "Lethal infrasonic pitch lies in the 7 cycle range. Small amplitude increases affect human behavior in this range. Intellectual activity is first inhibited, blocked, and then destroyed. As the amplitude is increased, several disconcerting responses have been noted. These responses begin a complete neurological interference. The action of the medulla is physiologically blocked, its autonomic functions cease." (source; the Sonic Weapon of Vladimir Gavreau, by Gerry Vassilatos)

I knew there was a possibility I could go deaf but not dead eek.gifbiggrin.gif

We all have to go sometime tongue.gif
post #401 of 540
Thread Starter 
Quote:
Originally Posted by Thomas-W View Post

This was no ordinary theater it was the one being used to create the 9 channel mix for the original version of Fantasia.
Nonbelievers should spend a little time with Bruce Thigpen's rotary sub. When he tested it at the RMAF, people were exiting the room with C/O's nausea/vertigo, I was present at that demo and watched people leave with the complaints
How about you, did you feel anything?

I could not think straight in the Pod emerging scene in WOTW when I really cranked it up, but that could be attributed to a sensory overload, visual and audio.
post #402 of 540
Quote:
Originally Posted by Thomas-W View Post

This was no ordinary theater it was the one being used to create the 9 channel mix for the original version of Fantasia.
So, what subwoofers existed in 1940 that could fill a large theater with high output subsonic bass?
post #403 of 540
Quote:
Originally Posted by Stereodude View Post

So, what subwoofers existed in 1940 that could fill a large theater with high output subsonic bass?
None. The best speaker available in 1940 was the Shearer horn, which only went to 40Hz..
Quote:
12 Cycles Per Second (Hz) - Walt Disney and his artists accidentally experienced infrasound on one occasion. A cartoon sound effect was slowed from 60 cycles per second to 12 cycles per second via a tape-editing machine and was amplified through the theater system. The resulting tone, though brief in duration, produced in the entire crowd nausea that lingered for several days.
Pure myth. No speakers existed then capable of any output, let alone high output, at 12Hz. And there was no such thing as tape editing in 1940. Tape was not used for sound editing until the late 40s.
post #404 of 540
Quote:
Originally Posted by JapanDave View Post

How about you, did you feel anything? .
Sure did. My vestibular system isn't particularly sensitive to very low frequencies so no problems.

Larry Borden of Stereo Times was in the room with me. Poor Larry turned green and bolted for the door when Bruce started playing below 10Hz tones.
post #405 of 540
I'd guess that like many things, any negative effects would be governed by both level of ULF, and perhaps more importantly, ... exposure time.

I'm also guessing that if the excitation freq coincided with resonant freq, whatever effect would likely be magnified.
post #406 of 540
I remember reading a paper published by B&K back in the 70s that described naturally occurring spaces (cavities??) within the human body that when exposed to a high enough SPL would resonate and cause discomfort. Some of those frequencies as I remember were low but not infra-sonic.
____________
Best Regards,
Carl Huff
post #407 of 540
Brown notes have been achieved by taco-corp and vuvuzelas. Just sayin' If you will it dude, it is no dream.
post #408 of 540
Thread Starter 
For the time being , I am EQ'ing the system.

Here are a few before and after shots of the EQ'ed room.

My Center Speaker


The subs,
post #409 of 540
How does the sound compare pre and post Dirac ?
post #410 of 540
Thread Starter 
Quote:
Originally Posted by HFGuy View Post

How does the sound compare pre and post Dirac ?
A lot better. After setting it up correctly , bass is no longer muddy, is much more controlled and resonance seems to be a lot better. I am still experimenting with alternate EQ options and I will post my findings.
post #411 of 540
Quote:
Originally Posted by JapanDave View Post

Got my first measurement of the subs today.
Nice dip @ about 27hz, but as my ears were telling me, much, much, much, much, much room gain.
Using a sound devices USBPre 2 with an Audix TM1 mic.

Yes, this happened in my room also. People kept telling me, (modeling programs also) that my
IB subs would get torn apart at reference with the power I was feeding them. Nothing could be
further from the truth. With the massive room gain, there are no issues.

On that note:

I love the overkill. But let's be real, if anyone think's this has practical application, they are wrong.
This has so much unused overhead, it's mind-boggling.

I have 4 18" Ficar IB3's set up as dual in-floor Infinite Baffle manifolds in a 1600 cubic foot room.

I can play *anything* at 5dB above reference, flat down to 5hz without breaking a sweat.
My system laughs at War of The Worlds and THX Amazing Life demo mushrooms.
My distortion levels are unmeasurable compared with any box subwoofer. Any additions
to my subwoofer system would add nothing.

Once again, I love this, and there is nothing wrong with it. But for those wanting to
build an IB system, something like my $1500 IB will perform just as well as the one
in this thread at reference levels.

The biggest issue is not output, it's placing the sub(s) correctly to minimize nulls and peaks, which
I was able to do with my dual manifolds.

Once again, not downing this system, it's awesome. Just don't want any newbs wandering
into this thread thinking this is what's needed for a decent Infinite Baffle system.
Edited by S_rangeBrew - 12/31/12 at 9:34am
post #412 of 540
Thread Starter 
Quote:
Originally Posted by S_rangeBrew View Post


I love the overkill. But let's be real, if anyone think's this has practical application, they are wrong.
This has so much unused overhead, it's mind-boggling.

Yeah, but being flat to 2hz @ reference sounds so cool!!! (That is if my mic and preamp are accurate, I am pretty sure they are though)
Quote:
Originally Posted by S_rangeBrew View Post

Once again, not downing this system, it's awesome. Just don't want any newbs wandering
into this thread thinking this is what's needed for a decent Infinite Baffle system.
Seriously though, you are right, you don't need drivers of this caliber to get very similar results. Thanks for the comments. smile.gif
post #413 of 540
Well since it was mentioned exactly how much distortion are we talking? At what spl and frequency? I wish my mic did not rolloff below 5hz or I would be flat lower. I have box sealed subs and I can play any movie over reference with a Low shelf boost as well.
post #414 of 540
Thread Starter 
Good question.
And I have to figure out a way to measure the EQ'ed response on my unit.
post #415 of 540
Thread Starter 
OK, I have started on the next stage of my IB build. This time I am going to go with a single baffle with the 3 subs.
post #416 of 540
Right on Dave! I was just wondering what was going on with that. Good luck and keep us posted.
post #417 of 540
Thread Starter 
Thanks Keager , have been pretty busy with work, but I have started the line array. Should have pics soon.
post #418 of 540
I'm curious Dave. Why did you switch from Seaton Cat12's to the Quest audio stuff? I remember a long time ago you being very excited and happy with the Cats. Did an amp break and you never got a replacement or something?
post #419 of 540
Thread Starter 
Quote:
Originally Posted by Jindrak View Post

I'm curious Dave. Why did you switch from Seaton Cat12's to the Quest audio stuff? I remember a long time ago you being very excited and happy with the Cats. Did an amp break and you never got a replacement or something?
In the beginning they were great, but every time I watched a movie my ears would hurt for days after even at very low SPL levels. At that time I did not know what it was, I thought I just needed to break in the drivers, but every time I listened to them I would get pain in my ears until I got to the point that 10 mins would be too much. Went to Dr many times and nothing abnormal was found, until one day I was in my theater and I did not realise I have the speakers on. The amps on the Cats were just in idle, but after about 30mins working in theater I had unbearable pain in my ears and I started to think I was going crazy and that the room was to blame. That was until I realized that I had the speakers switched on. So I started to do some tests to eliminate what was causing the problems and finally I found that I could not be in the same room with high powered amps. I tested this with other high powered amps and came to the same conclusion.

So long story short, I can't have active speakers with the amp being attached to speaker itsself. Mark was very good with trouble shooting everything.
post #420 of 540
"The amps on the Cats were just in idle, but after about 30mins working in theater I had unbearable pain in my ears and I started to think I was going crazy and that the room was to blame. That was until I realized that I had the speakers switched on. So I started to do some tests to eliminate what was causing the problems and finally I found that I could not be in the same room with high powered amps. I tested this with other high powered amps and came to the same conclusion."

that is interesting and the first time that i have ever heard of that.
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