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Old 9th March 2011, 01:31 AM   #1
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Default Visaton NoBox...is this for real!?!?

Hi,
I recently purchased a pair of the Visaton BGS40 drivers in hope of making a spinoff of the NoBox design seen at Enjoythemusic.Comsat website. When o ran this article over to a friend who has helped me with many XO designs he quickly pointed out that the claims of this design are way overinflated. Using the manufacturers data he simulated it and showed there was no way you would be able to get the bass out of this OB with these drivers like the article shows. I am wondering if anyone here has experience with this design and what it was. I am now very reluctant to spend any further effort and time on these. My plans were to use a pair of the now out of stock PE firesale noname 12" coaxial drivers with the compression tweeters inside mated to the Visatons on a similar baffle.

I would love to hear some real experience with this design.
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Old 9th March 2011, 01:32 AM   #2
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Here's the website for the NoBox project
The VISATON NoBox BB Loudspeaker Kit Review By Dick Olsher
Jeff
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Old 9th March 2011, 01:36 AM   #3
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And here's the 12" I was planning on substituting for the top end...

12" Cast Frame Coaxial Pro Speaker
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Old 9th March 2011, 01:54 AM   #4
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I would only fear of the treble response ,not the bass ,in the No Box design.
And I would stay away from buyouts and PA drivers unless they give you what you need
precisely.
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Old 9th March 2011, 02:30 AM   #5
ejfud is offline ejfud  United States
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I've been wondering the same for a while myself. I wanted to grab those woofers and try it out myself. It's a simple build, give it a try.
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Old 9th March 2011, 02:41 AM   #6
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Mmmh.I didn't read the first statement of this thread ! Visaton BGS40 it's not what i would expect to perform best in a OB . Well ...+- 8mm excursion are not too bad ,but that's when the cone is nearly leaving to ...
Maybe Jmiller did refer to this idea when thinking of doubling the cones and adding a tweeter :
Big OB fun. Come hear!

Last edited by picowallspeaker; 9th March 2011 at 02:48 AM.
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Old 9th March 2011, 03:54 AM   #7
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From the pics, it looks similar in concept to MJKs passive baffle and it suffers no lack of bottom... if the Visaton is low Q some Q may be called for.

dave
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Old 9th March 2011, 05:57 AM   #8
ra7 is offline ra7  United States
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I would say build it. Low Q doesn't mean lack of bass... a 15" driver is barely moving and it takes some amount of EQ before you can run it out.

It will probably need some EQ on the bottom end. The beauty of OB is its simplicity. For minimum effort, you can get pretty decent sound. This design can almost certainly be made to work.
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Old 9th March 2011, 09:52 AM   #9
Rudolf is offline Rudolf  Germany
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Quote:
Originally Posted by jmillerdoc View Post
Using the manufacturers data he simulated it and showed there was no way you would be able to get the bass out of this OB with these drivers like the article shows.
Nice friend you've got.
Could you tell us what he simulated and how it could be nearer to reality than the measurements of Dirk Olsher? How did he include the side wings into his simulation? How did he account for the floor boost? Any simulations short of Boxsim or MJKs worksheets probably won't do justice to the NoBox.

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Old 9th March 2011, 10:33 AM   #10
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It never fails to amaze me how someone can simulate something and declare whether or not same works in reality.
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