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Old 17th June 2011, 02:47 PM   #271
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Quote:
Originally Posted by markaudio View Post
Try your winzip and other software, you'll get a nice box design for this CHR.
Mark

Can you clarify "Winzip", I would like to know the software package you meant?

Thank you
Miles
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Old 17th June 2011, 03:42 PM   #272
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Quote:
Originally Posted by MilesCampbell View Post
Mark

Can you clarify "Winzip", I would like to know the software package you meant?

Thank you
Miles
I believe it is a compression/decompression widget for the ailing Windows platform. What you were supposed to winzip I don't know.
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Old 17th June 2011, 03:57 PM   #273
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I think he meant to use winisd - LinearTeam

It's a box modelling program. I personally use unibox - UniBox - Unified Box Model for Loudspeaker Design - Kristian Ougaard

Because it's an excel spreadsheet and I didn't want to install ANOTHER modelling program on my computer. I think winisd is more powerful though. Haven't used it so I can't say for sure though.
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Old 17th June 2011, 04:11 PM   #274
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Here's a quick unibox plot:

Click the image to open in full size.

Warning, pretty much no thought went into this. It's not necessarily a good design :P
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Old 17th June 2011, 06:26 PM   #275
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Quote:
Originally Posted by tuxedocivic View Post
Warning, pretty much no thought went into this. It's not necessarily a good
design :P
A tip. I like to keep the 1st derivative of the modeled curve from changing sign more than once. You have a dip at 55 Hz (?) that violates this guidline. Means the box is too big or the tuning too low or both.

You will get a lower F3 but along with, the flabby, ugly kind of bass that gives BR a bad name.

So far in mine (& Scott's) modeling CHR70.3 pretty much drops into all the old boxes but in extreme sizes some tweaking is beneficial*. I would suggest a BR box size of just under 5-10 litres (* with the 70.3 i am comfortable venting a milliSize, whereas i left them sealed before)

dave
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Old 17th June 2011, 06:28 PM   #276
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Originally Posted by markaudio View Post
Hi Guys,
Here's an old plan that now likely needs modification.
Pensils: The range of Pensils have all been updated for the latest drivers. The single sheet summary should be posted later today, the comprehensive document is not far behind.

dave
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Old 17th June 2011, 06:38 PM   #277
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That's basically why I put that warning. I saw some other saying 11 to 14L so I put in 12 and ask the calculator to figure the rest. Thought it looked ugly, hence the warning.

I was more interested in this:

Click the image to open in full size.

Because I already have an 8.6L box with that tuning. Just need to make a new baffle for it. Looks pretty decent considering I already have the box and a new baffle is easy.

EDIT - The label in the picture says Fountek, but it's for the CHR70. Just didn't change the label when I modelled it.

Last edited by tuxedocivic; 17th June 2011 at 06:42 PM. Reason: Picture clarification
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Old 17th June 2011, 06:46 PM   #278
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That is quite close to the CHR-Ken volume & tuning. It wouldn't hurt to shorten the port a bit (raise the tuning)

dave
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Old 17th June 2011, 06:50 PM   #279
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It wouldn't hurt to shorten the port a bit (raise the tuning)

dave
I was looking at that, if I were to use those cabs. But I'd still want to keep the cabs tuned for the project they were intended for. It would just be convenient.
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Old 17th June 2011, 07:04 PM   #280
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Right now I'm spinning between CHR, EL70, and Alpair 7

I want to try a purist approach with one of these 4". Alpair 7 is pushing the budget, but looks SOOOO good. Already love the EL70. Will have to wait for VI DIY Fest to be convinced
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