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View Full Version : New articles written by Dr. Floyd Toole x4 subs



JBL 4645
11-08-2006, 01:29 PM
I have heard thereís a new article written by Dr. Floyd Toole, on using 4 sub bass units to smoothen out the bass response. If so is this article currently published over the Internet?:)

clmrt
11-08-2006, 01:42 PM
Probably not this - -

http://www.infinitysystems.com/homeaudio/technology/whitepapers/inf-rooms_3.pdf

Perhaps this....

http://www.harman.com/wp/pdf/multsubs.pdf


...yes, the second one.

Titanium Dome
11-08-2006, 02:01 PM
This is the seminal work, which I've referenced many times (here and elsewhere) as my bible of sub deployment.

http://www.harman.com/wp/pdf/multsubs.pdf

Then there's this well-known interview by Dr. Toole and Todd Welti as the follow up to the white paper.

http://www.onhometheater.com/features/20040801.htm

Todd Welti and Allan Devantier published a paper on the topic with AES in May:

http://www.aes.org/e-lib/browse.cfm?elib=12417

If you're not an AES member, it'll cost you $20 to read it.

Titanium Dome
11-08-2006, 02:03 PM
If you want to see a picture of ol' Floyd and read an older article, then this is for you.

http://www.homecinemachoice.com/articles/hccarticles/interviews/FloydToole/FloydToole.php

JBL 4645
11-08-2006, 02:29 PM
Titanium Dome

Cheers mate Iím reading though the first one now this could be the holy Grill of JBL sound mate.:applaud:

clmrt
11-08-2006, 03:01 PM
What am I, chopped liver??:D

JBL 4645
11-08-2006, 04:15 PM
clmrt

LOL, no mate high numbers to you too mate well done:applaud: we must all work together if where to discover the Holy Grail of Sub Bass in the home cinema, a more purer and more smoother response for a wide listening area.

There is a lot of mathematics in it that I donít fully understand while the practical term of just simple placement in the room may solve the problems within a few minutes or more.

Zilch
11-08-2006, 04:30 PM
Geddes just wrote (June, actually, but published October) in a letter response to the AES Journal Welti & Devantier article that mounting "one of subs [of three total] above the room's centerline significantly reduces the variance of the field in both spatial and frequency domains."

"A paper is planned...."

So, our HT sub should be ABOVE the screen? :dont-know

clmrt
11-08-2006, 05:58 PM
Floor-to-ceiling stacks....drool

Zilch
11-08-2006, 06:20 PM
Don't care WHAT he says, I ain't hangin' no Sub1500 from the ceiling, nope.

[And CERTAINLY not the TCB Monster Sub.... :p ]

Titanium Dome
11-08-2006, 06:25 PM
What am I, chopped liver??:D

Mm-m-m-m-mmm! Chopped liver.

JBL 4645
11-09-2006, 06:58 AM
Don't care WHAT he says, I ain't hangin' no Sub1500 from the ceiling, nope.

[And CERTAINLY not the TCB Monster Sub.... :p ]

Zilch

LOL, the next thing you know it breaks away from the ceiling and bloody warring the damn thing! :D

You could build a false ceiling however, with enough support to take the weight, the calculated weight of the sub bass units that would be installed in the ceiling.

Question is, do you stick just the sub bass driver into the ceiling or the whole damn thing! I have seen the JBL in-ceiling sub bass donít worry mate, itís just this what design do you go with?

JBL 4645
11-09-2006, 07:04 AM
Don't care WHAT he says, I ain't hangin' no Sub1500 from the ceiling, nope.

[And CERTAINLY not the TCB Monster Sub.... :p ]

http://www.123zoeken.be/foto/foto400/ART24._JBL_TCB_klankkasten_10313589120.jpg

LOL, Oh yeah sheís a beauty this is all need sod the neighbours Iím going to play this JBL sucker loud!!:applaud: :D

hjames
11-09-2006, 07:06 AM
Zilch

LOL, the next thing you know it breaks away from the ceiling and bloody warring the damn thing! :D

You could build a false ceiling however, with enough support to take the weight, the calculated weight of the sub bass units that would be installed in the ceiling.

Question is, do you stick just the sub bass driver into the ceiling or the whole damn thing! I have seen the JBL in-ceiling sub bass donít worry mate, itís just this what design do you go with?

Is that like "The Damocles Code"
Hang subwoofers from the ceiling but be careful where you sit?
I can see the movie now ...
:eek:

JBL 4645
11-09-2006, 07:32 AM
hjames

Na mate it will be ok, just make sure you stick a few extra supports under the ceiling!

I can imagine the force of air mass flow and the sound pressure levels with x4 JBL TCB 18Ē THX in the room damn boy play that baby loud and stick in the earplugs!:applaud: :p