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Old 27th April 2011, 02:18 AM   #1
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Default Lone Star Audio Fest 2011 -- Dallas, TX

I am really looking forward to Lone Star Audio Fest in Dallas this year. The show is May 13-15 and it's completely, 100% free. This will be my third year and I've never been disappointed.

Bob Brines is debuting two new single-driver models, one with the Alpair 7 (folded TL) and another with the Tang Band W8-1772. Plenty of good things to hear.

If you are planning to attend, please chime in. More info: Lone Star Audio Fest
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Old 27th April 2011, 03:19 AM   #2
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In....and likewise my third year.
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Old 27th April 2011, 03:22 AM   #3
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Me three. Second time. Ahm a real Texan now, y'all.
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Old 27th April 2011, 01:30 PM   #4
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I'm writing up the info on my new A7 TL for my web page, but here is a first look. The cabinet is a 36" 6:1 taper TL. While I was doing the modeling, I compared a constant taper pipe with a three constant CSA sections. Not much difference in performance, but the three section pipe is a lot easier to build. The prototype is veneered with walnut and finished with polyurethane.

The pictures are attached to this first post. Performance will be attached to the second post.

Bob
Attached Images
File Type: jpg Alpair 7 TL.jpg (79.7 KB, 551 views)
File Type: jpg Tl Interior.jpg (80.3 KB, 533 views)
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Old 27th April 2011, 01:36 PM   #5
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The first graph is the FR. 0.5m, SPL is relative.

Colors:
White=0*
Red=10*
Blue=15*
Green=30*
Yellow=45*
Violet=60*

Second graph is impedance

Waterfall

THD

Colors:
White=1
Red=2
Blue=3
Green=4
Yellow=5
Violet=6

Enjoy,
Bob
Attached Images
File Type: gif FR Graph.gif (44.9 KB, 522 views)
File Type: gif Impedance.gif (32.4 KB, 510 views)
File Type: gif Waterfall.gif (112.5 KB, 499 views)
File Type: gif THD.gif (62.7 KB, 83 views)

Last edited by Bob Brines; 27th April 2011 at 01:39 PM.
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Old 27th April 2011, 01:38 PM   #6
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Quote:
Originally Posted by Bob Brines View Post
I'm writing up the info on my new A7 TL for my web page, but here is a first look. The cabinet is a 36" 6:1 taper TL. While I was doing the modeling, I compared a constant taper pipe with a three constant CSA sections. Not much difference in performance, but the three section pipe is a lot easier to build. The prototype is veneered with walnut and finished with polyurethane.

The pictures are attached to this first post. Performance will be attached to the second post.

Bob
Bob,

The sides butting out a bit in the front...would that pose a problem with radiation?
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Old 27th April 2011, 01:41 PM   #7
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Quote:
Originally Posted by aptquark View Post
Bob,

The sides butting out a bit in the front...would that pose a problem with radiation?
The speaker is designed to accommodate a grill. This is cosmetic.

Bob
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Old 27th April 2011, 01:41 PM   #8
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sweet, thanks
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Old 27th April 2011, 03:00 PM   #9
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This A7 TL looks like a nice compact speaker. I am still deciding on a box that I'll use for surround, and occasionally as front speakers to enjoy the full range magic.
Bob, do you intend to make the dimensions and stuffing details for your box available? Cheers.
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Old 27th April 2011, 03:33 PM   #10
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Quote:
Originally Posted by talaerts View Post
Bob, do you intend to make the dimensions and stuffing details for your box available? Cheers.
Yes and no. As with the recent Scottmoose and Planet10 stuff, I will be charging for the plans. I will probably have them up on my web site a week or so after LSAF.

However, you could probably reverse engineer them from the following:

OD 17 1/2"x6 1/2"x8 1/4". 12mm BB and 6:1 taper. Leave one side removable for testing. Line two sides of the front and back passages with 5/8-1" acoustic fiberglass. No further stuffing should be required.

Bob
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