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Old 14th August 2012, 07:17 PM   #21
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Record is not great when using ANs in BR or using BR in general?
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Old 14th August 2012, 07:30 PM   #22
Bigun is online now Bigun  Canada
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Quote:
Originally Posted by planet10 View Post
Thinking of a practical box that isn't an OB (which i have never been enamoured of), i was figuring a couple hundred litre, box damped like a boffle with a swiss cheese back (you need a back to make the box structurally strong).

dave
Yes ! - I was also thinking about the Boffle the other day, I like the idea a lot and have been collecting information (including from your website). Yesterday I came across somebody who actually knows a man who heard from a friend that his pal's neighbour met this chap down the pub who actually built one and he said "I can tell you that it worked brilliantly" (it was posted on a hi-fi vision forum Aug 2010 but I can't get the link to work from here)

I ran some box simulations a couple of weeks ago and found that a good number was around 250 litres but I figure my box will give me a bit more than this which can only be better.

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Originally Posted by Scottmoose View Post
Since the CSA plans were mentioned, I was largely just dreading they were going to be run as a BR (since their record isn't great when it comes to box alignments ).
Absolutely - I wouldn't really see a BR as an option here, although there have been boxes that look like a BR but were in fact MLTLs. Anyhow, seems we're both on the same page !

In terms of experiments - my plan is to build a box with removable back. This gives me a well-braced solid platform to try a) open backed box (a.k.a. Yamamoto YS-500), b) a boffle, c) closed box with aperiodic vent, d) sealed.
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Last edited by Bigun; 14th August 2012 at 07:44 PM.
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Old 14th August 2012, 07:52 PM   #23
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Quote:
Originally Posted by eventhorizon View Post
Record is not great when using ANs in BR or using BR in general?
I mean most of CSA's cabinets are at best IMO of questionable merit and you'd get better results by using them in a properly designed enclosure.
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Old 14th August 2012, 07:58 PM   #24
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Now that we are on topic, what is the "proper" enclosure for this driver? Has it been modeled before. CSA has very basic designs and bases their opinions on practical application vs. modeling with software.
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Old 14th August 2012, 08:46 PM   #25
ra7 is offline ra7  United States
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What's a boffle?

I bet they would sound in these:
http://www.passdiy.com/pdf/KleinHorn.pdf

Also, to get any sort of bass from them, you'd need a BR. Think high-eff, big magnet, heavily overdamped. Eminence Deltalite 2515 II. It's really a midbass.

It doesn't want any more air in the back damping its cone motion at resonance, it's huge magnet is doing that already.

Last edited by ra7; 14th August 2012 at 08:49 PM.
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Old 14th August 2012, 08:57 PM   #26
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You know I love big speakers but I must say I am having trouble wrapping my head around a refrigerator sized box and a 1mm Xmax.
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Old 14th August 2012, 09:32 PM   #27
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keep going bigun
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Old 14th August 2012, 09:55 PM   #28
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Quote:
Originally Posted by planet10 View Post
Thinking of a practical box that isn't an OB (which i have never been enamoured of), i was figuring a couple hundred litre, box damped like a boffle with a swiss cheese back (you need a back to make the box structurally strong).

dave
I have built and measured this for the AN 15, and yes it does work quite well.

Sometimes I think you are my twin brother. Hahaha
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Old 14th August 2012, 10:39 PM   #29
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Quote:
Originally Posted by ra7 View Post
Also, to get any sort of bass from them, you'd need a BR.
Why? With room gain it looks pretty easy to get into the 20s pretty solid.

Too small a box pushes the Q up, making it aperiodic pulls it back down.

dave
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Old 14th August 2012, 10:44 PM   #30
Bigun is online now Bigun  Canada
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Quote:
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What's a boffle?
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File Type: jpg Boffle speaker.jpg (237.8 KB, 1037 views)
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