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peter G.
01-15-2010, 03:26 PM
Does any one have any experience coupling sets of 4311's? I am expanding my control room and I own 2 sets of 4311b's. I am wondering if any body has experimented with coupling these boxes...I am searching for larger monitors (4335) but this is becoming a tough find. so what I have is (4) 4311's

Zilch
01-16-2010, 12:31 PM
Control room?

Stacking?

A bad idea. It's AXIOMATIC: multiple sources playing the same program concurrently in a single acoustic space interfere with each other in a complex manner dependent upon the differential distances to those sources.

[Fun, but, well, uhmmm, ... dumb.... :rolleyes: ]

SMKSoundPro
01-16-2010, 12:45 PM
I agree with Zilch. I had four 4311's in my living room stereo for a time, with them stacked 2 high. They didn't sound as good as just one single pair. Now, all four of them live in a bar playing dance videos and the juke box.

For a control room, there are some other options that are not very costly.

Good luck and welcome to the forum.

Scotty.

demon
01-17-2010, 03:50 AM
hello!

if you have time to spend and if you are willing to try things out (=play around), you could build a two-way d'appo speaker:
place a nice horn or waveguide on one 4311 (where you only use the woofer), then place the second 4311 on the horn (just the woofer, too).
this could work if done right (details, details).

dont know what you think of it, but it was the first thing that came into my mind.

cheers
mikey

ps:
larger monitors (4335 you mean 4435? i own a pair, they are great!!

JBL 4645
01-17-2010, 06:36 AM
Someone here has nice set-up of 4311
http://www.audioheritage.org/vbulletin/showpost.php?p=266080&postcount=270 (http://www.audioheritage.org/vbulletin/showpost.php?p=266080&postcount=270)

Nice little leaflet on the 4311
http://www.lansingheritage.org/images/jbl/specs/pro-speakers/1986-4312a/page2.jpg (http://www.lansingheritage.org/images/jbl/specs/pro-speakers/1986-4312a/page2.jpg)

peter G.
01-17-2010, 02:22 PM
hello!

if you have time to spend and if you are willing to try things out (=play around), you could build a two-way d'appo speaker:
place a nice horn or waveguide on one 4311 (where you only use the woofer), then place the second 4311 on the horn (just the woofer, too).
this could work if done right (details, details).

dont know what you think of it, but it was the first thing that came into my mind.

cheers
mikey

ps: you mean 4435? i own a pair, they are great!!

oops, yes 4435....want to sell them?

peter G.
01-17-2010, 02:26 PM
Control room?

Stacking?

A bad idea. It's AXIOMATIC: multiple sources playing the same program concurrently in a single acoustic space interfere with each other in a complex manner dependent upon the differential distances to those sources.

[Fun, but, well, uhmmm, ... dumb.... :rolleyes: ]


easy now......asking questions here....

peter G.
01-17-2010, 02:29 PM
I agree with Zilch. I had four 4311's in my living room stereo for a time, with them stacked 2 high. They didn't sound as good as just one single pair. Now, all four of them live in a bar playing dance videos and the juke box.

For a control room, there are some other options that are not very costly.

Good luck and welcome to the forum.

Scotty.

thanks Scotty, I was afraid of that, have not had time to try yet so again thanks........and what a lucky bar!

Zilch
01-17-2010, 08:54 PM
easy now......asking questions here....To answer, then, "Yes," I've done it, measured it, posted the results, and briefly enjoyed the ensuing enhanced festival of phase interference.

http://www.sfu.ca/sonic-studio/handbook/Interference.html

See 2: Demonstration of Principle here:

http://www.jblpro.com/catalog/support/getfile.aspx?docid=231&doctype=3

SMKSoundPro
01-21-2010, 08:14 AM
Thanks Zilch for posting those two links. Very imformative!
Scotty.

peter G.
01-24-2010, 12:12 PM
To answer, then, "Yes," I've done it, measured it, posted the results, and briefly enjoyed the ensuing enhanced festival of phase interference.

http://www.sfu.ca/sonic-studio/handbook/Interference.html

See 2: Demonstration of Principle here:

http://www.jblpro.com/catalog/support/getfile.aspx?docid=231&doctype=3


Thank you for this responce, the links are helpfull.

boputnam
01-25-2010, 04:36 PM
To answer, then, "Yes," I've done it, measured it, posted the results, and briefly enjoyed the ensuing enhanced festival of phase interference.It's called comb filtering, and presents itself differently dependent upon where you are in the listening area, relative to boundary planes, etc. Trying to stack or array non-arrayable cabinets, while fun :bouncy: , typically yields audible flanging as you move through the sound field. That, btw, is the cheapest method I know of to check for comb filtering...




This might be hard to see, but here is a good example, taken at a recent Smaart training, of some (bad) flanging produced by a poorly focussed system in a major hall in SoCal.

Y-axis = Time in ms
X-axis = ƒ in Hz
Intensity (gain) is color, in relative dB, with warmer = higher.
The measurement mic was moved across the sound field, only one side of the PA was firing; comb filtering (flanging) from boundary reflections is represented by the sub-vertical bands of warm color in the MF to UHF ƒ range. Color (gain) range was optimized to enhance the visualization of the "effect".