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PostPosted: 31 Dec 2010, 10:04 
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Joined: 03 Jan 2009, 10:44
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Hello, all, and Happy New Year!

A while back I was investigating speaker designs and came across a web site with an interesting approach for a line array speaker design. I'm not sure where I found the link originally...if it was from someone here, thank you! I promptly forgot the site's name and didn't bookmark it. In any event, I finally found it and wanted to share the link with folks here.

http://www.dmitrynizh.com/labaffles.htm

It's an interesting article which appears well researched. I'd like to hear opinions from others about the design. I'll probably build a pair once I find a source for drivers. My version will probably use 9 drivers per column so price will be important.

Anyway, here it is. The site has some other interesting projects as well. Enjoy!
Lofton


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PostPosted: 31 Dec 2010, 11:37 
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The beauty of that system is the extemely high efficiency and the amplifier choices are endless.
Subwoofer integration could be a challenge.

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PostPosted: 06 Jan 2011, 20:39 
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Today I received my order of 3 1/2 inch drivers from Parts Express and am going to try to replicate the system described on the site. Got 16 Vifa TC9FD-05-16 3-1/2" Full Range Drivers at $7.20 each. Coulda gotten them for $6 but didn't hit the send key fast enough.

Specifications:
*Power handling: 10 watts RMS/30 watts max; *VCdia: 20 mm *Le: 1.04 mH; *Impedance: 16 ohms; *Re: 11.47 ohms; *Frequency response: 87-15,000 Hz; *Fs: 115 Hz
*SPL: 83.3 dB 1W/1m; *Vas: 0.05 cu. ft.; *Qms: 3.45; *Qes: 1.65; *Qts: 1.12; *Xmax: 2 mm.

I'm planning to have three vertical baffles, three drivers top, two center and three bottom. I'll post pics as it comes together. For now I'll use my K-12 amp and later, my KT77 Odd Watts.


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PostPosted: 07 Jan 2011, 03:46 
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Location: Christchurch, NZ
Great choice for drivers. Those VIFA fullranges are very good sounding.

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PostPosted: 07 Jan 2011, 19:22 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
Great driver choice indeed! Also, be sure to read through the Design Guidelines for Practical Near Field Line Arrays by Dr. James Griffin. There is a bunch of great info in the guidelines.
Attachment:
Design Guidelines for Practical Near Field Line Array - Jim Griffin.pdf

Cheers


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PostPosted: 08 Jan 2011, 11:27 
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Thanks, all! Hopefully my concept is a good one...the speakers are for my office, which is small (10 by 12 feet). The walls are plaster. The length of each array will need to be about three feet and will be suspended in some yet-to-be determined manner. I suspect some experimenting will be required!


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PostPosted: 08 Jan 2011, 14:08 
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Hi Lofton, were you also considering using a super tweeter to cover off the extreme high-end?

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PostPosted: 08 Jan 2011, 16:50 
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Hello, Gio. Actually, I hadn't given a tweeter much thought. However, since I bought an even number of full-range drivers (8 per speaker) when I should have bought 9, there's an open spot for a tweeter in the center baffle. What would you suggest? Lofton


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PostPosted: 09 Jan 2011, 20:29 
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Do you have a data sheet for that driver?

It would be a high XO point so perhaps a horn or super tweeter with a first order XO 10kHz+. Have you worked out a wiring scheme, impedance and combined sensitivity? You'll need that info to pick a tweeter.
Cheers

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PostPosted: 17 Jan 2011, 14:02 
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Hi, Gio.. Here are the specs for the drivers:
*Power handling: 10 watts RMS/30 watts max; *VCdia: 20 mm *Le: 1.04 mH; *Impedance: 16 ohms; *Re: 11.47 ohms; *Frequency response: 87-15,000 Hz; *Fs: 115 Hz
*SPL: 83.3 dB 1W/1m; *Vas: 0.05 cu. ft.; *Qms: 3.45; *Qes: 1.65; *Qts: 1.12; *Xmax: 2 mm.

The proposed wiring scheme is attached. My intent is to have 8 ohms impedance...please let me know if I got it right! Calculating sensitivity hurts my brain, but according to the source web site, I should see about 91.3 dB. Again, please check my math. For now, I'm going to forego a tweeter, but can add one later.

For simplicity's sake, each driver will have its own baffle. The ends of each baffle will be shaped (alternating convex and concave surfaces) so I can easily alter the radius of each array. There is a crude drawing of how the ends of the baffles will be shaped, as viewed from the side.
Attachment:
Speaker array.png

Attachment:
Baffle end coves.PDF


Any suggestions welcomed!


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