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Old 1st August 2006, 05:04 AM   #1
navin is offline navin  India
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Default 4 driver line array using fullranges

I started a new thread as I did not want to hi jack the one below.

Jordan JX6 full-range line array

Do 4 driver line arrays only work acceptably with some drivers (like the Jordans) or can one substitute cheaper drivers like the Fostex FE87, FF85K or Vervox 3?

Or is this excercise not worth the effort as for the cost on 4 FF85K or Veravox 3 one can get 1 Jordan JX92 which can easily produce as much bass as 4 3" fullrange drivers?

The JX92 however has a rising hf response while the 4 driver array would have a falling one. Both would require equallization or toe-in or some other form of "help".

As fas as using smaller fullranges goes, I understand that to compensate for polar interference the drivers used in line arrays must have a rising hf response or the line array must be equallised accordingly.

I have also seen loudspeakers (in particular a Snell Type C/III) that used a rear tweeter to add air to the HF.

Can one do the same with line arrays i.e. use a rear tweeter to compensate for the polar interference?
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Old 1st August 2006, 05:42 AM   #2
Dumbass is offline Dumbass  British Antarctic Territory
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I have posted one or more threads similar to this one regarding "mini" arrays.

There are the Jordan 4-arrays with 50mm drivers, also the Seventh Veil array using four Bandor 50mm drivers. AFAIK people who have heard these systems do not typically talk about "combing", or high freq dropoff, etc.

After doing some back-of-napkin calcs based on nflawp, etc, my conjecture is that these mini-arrays operate in far-field mode for majority of situations, but still get a lot of the advantages of nearfield line arrays wrt power handling, etc. Theoretically you should get some high freq dropoff when your ears are below or above the extent of the array, but I haven't heard of that happening.

The Tangband 2x3 inch drivers look very interesting to me, in terms of putting together a 4-array, CTC distance same as Jordans or Bandors. They don't have the upper or lower frequency extension of the more expensive drivers, but might sound surprisingly good.
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Old 1st August 2006, 04:49 PM   #3
el`Ol is offline el`Ol  Germany
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There are cheap Ciare 65mm drivers with good sensitivity at
http://www.spectrumaudio.de
("Breitbandlautsprecher", "Übersichtstabelle")
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Old 1st August 2006, 06:54 PM   #4
Colin is offline Colin  United Kingdom
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4 cheap (less-good) drivers are just going to sound like louder cheap drivers, rather than one good quality driver.

I've heard the linear array using JX53s and it works. I was less convinced by the 7th Veil but that was at a show, with the usual hotel room acoustics. Although similar in appreance, the drivers are quite different.

Navin - the JX92's rising response is deliberately to mimic the linear array's ability to hold a central image as you move left or right. And it works. See question 2 on the Jordan FAQ page.
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Old 2nd August 2006, 05:58 AM   #5
navin is offline navin  India
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sure 4 cheap drivers will sound as bad (if not worse) than 1 cheap driver but I was considering Fostex FF85K or Veravox 3 which are suppsoed to be good (but just a different kind of fish when compared to the JXR6).

Coiln: the JX92 is my reference. It is the driver I will fall back on if I cant find an alternate. It is also the only small fullrange driver I have heard. All I know for certain is the cabinets will have to flank a LCD sceen and have an internal volume of about 10 liters.
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Old 2nd August 2006, 07:18 AM   #6
amt is offline amt  United States
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Have you seen this? I had looked at it awhile back and thought it might be interesting.

http://www.madisound.com/pdf/fostexc...5k_tallboy.pdf


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Old 2nd August 2006, 07:38 AM   #7
navin is offline navin  India
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Quote:
Originally posted by amt
Have you seen this? I had looked at it awhile back and thought it might be interesting.

http://www.madisound.com/pdf/fostexc...5k_tallboy.pdf


amt
Oh yes and that is what gave me the idea of usig the FF85K in a 4-in-line (geez it look like we are taking car engines here) configuration. Then I got to know of the Veravox 3.

I live in India. We dont get to hear these drivers much less order them and send them back. I have heard the JX92 and it sounded good (that is what got me interested in fullranges in the first place) on 2 channel audio unfortunately we did not have 5 JX92s to use in a HT system! :-(

So given my budget (about $150-200 per chanel) and size (8-10 liters each) constraints I was hoping to garner opinions on using ONE JX92 vs 4 x FF85K/Veravox3 or an alternate driver (tangband?) or even 2xFostex 108Sigma (if I can get them cheap).

The reason I did not mention the 2 x 108 sigma combo earlier is that I expect that given the larger dia of the 108 vs the 85K the HF roll off and other distortions associated with 2 drivers reproducing the higher frequencies would be worse with 2 x 108 vs 4 x FF85K/Veravox 3.

Same for the Tangband drivers like the W4-1320. Similarly I dont think the W3-1364 would compare well against Fostex or Vervox. I could be wrong though. I only wish we had reviews of these available.
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Old 2nd August 2006, 09:29 AM   #8
Colin is offline Colin  United Kingdom
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I've used a pair of JX92s in the 48 MLTL flanking a screen and they worked really well for The Incredibles. Everything locked onto the image on screen, good stereo spread and the bass came across well. A couple more for background use (or the JX6s, suitably bandwidth-limited) would work well in small to medium rooms. It's a set up I intend to explore further once the projector and screen have permanent homes.

Note that the Jordans are good in humid environments - not sure what weather you're having out there right now.
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Old 2nd August 2006, 07:13 PM   #9
navin is offline navin  India
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Bombay as they is either hot and wet or just plain hot. this being the monsoon season it is hot and wet.

Coiln, do you intend to use a center or only 4 speakers.
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Old 2nd August 2006, 07:15 PM   #10
Colin is offline Colin  United Kingdom
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Only 4. But it won't be for some time yet.
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