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Old 2nd January 2013, 06:23 PM   #51
ridikas is offline ridikas  United States
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Gornir, any chance we can see a "transient perfect" two-way design from you in the future?
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Old 2nd January 2013, 06:34 PM   #52
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Thank you. Heading home now. I have applied damping sheets from europe audio... Can strip off them if not good
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Old 2nd January 2013, 06:52 PM   #53
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Quote:
Originally Posted by ridikas View Post
Gornir, any chance we can see a "transient perfect" two-way design from you in the future?
Never say never, but it's not the easiest design top pull off successfully.

/Göran
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Old 2nd January 2013, 07:05 PM   #54
ridikas is offline ridikas  United States
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Quote:
Originally Posted by gornir View Post
Never say never, but it's not the easiest design top pull off successfully.

/Göran
I've been looking at your website, you have tons of awesome designs! Revelation Two – Monitor MkII is so tempting
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Old 4th January 2013, 08:55 AM   #55
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I've played with Unibox.
All parameters are same as you say Ridikas.
I have entered current port diameter of 5cm, in red graph of port length I have 12.54- it means I need to cut port to that length ? And in design by vb fb and q is different again.
And yes, according to the simulation, I need heavy stuffing of box.
I had a look on dynamat- but there is consensus if box is well braces (my - is, as I glued every panel with 3 dowels on each joint with well made brace)it is not necessary.
Next is a fiberglass. If I get uk similar, should I still use wool or any other filler together ?
Bubble wrap is to put between driver and a brace ?

Thank you
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Old 4th January 2013, 05:01 PM   #56
ridikas is offline ridikas  United States
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You've told me that the inner port diameter was 5.4cm previously, so yes, the length will be different in your modeling if you're using 5cm...

You can use wool, but it really doesn't kill standing waves. From years of experience, I can tell you the bubble wrap works very well.
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Old 4th January 2013, 05:42 PM   #57
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Sorry, probably was posting from smartphone and made a mistake.
Which one of these two values more important- I think vb/fb/q one ?
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Old 4th January 2013, 06:15 PM   #58
ridikas is offline ridikas  United States
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OK, I've modeled the new port 5cm inner diameter and 14cm long. In a 15 liter cabinet, with walls covered, I get the following:

Fb = 46Hz
F3 = 47Hz
F6 = 41Hz
F10 = 35Hz

With a peak of only 0.3dB. Fairly insignificant.

Since your box will be semi-stuffed, because you want to kill standing waves, resonances/noises leaking out of the ports, etc., in a heavy filled enclosure it looks like this:

Fb = 43Hz
F3 = 54Hz
F6 = 41Hz
F10 = 34Hz

With no peaking. This is a low Q, smooth roll-off.

And in a box with the amount of stuffing between heavy fill and walls covered, I get:

Fb = 45Hz
F3 = 49Hz
F6 = 41Hz
F10 = 35Hz

Again with no peaking, but with a sharper knee (higher Q) roll-off.

Basically the differences are small and your design is not sensitive to slight variances. Do NOT cut the port. Leave it as it is.

Line the walls with 0.75"-1.00" rigid fiberglass panels (Corning 703) and stick a roll of bubble wrap (a sheet of 120cm by 60cm) in the center of the box. Try to position it between the ports and the woofer, but do NOT obstruct the port openings.
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Old 4th January 2013, 06:29 PM   #59
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You are amazing !

Thank you for helping out with port.

BTW I am not in a hurry so if bigger diameter (and flared) port is better I can order it.
But if you say it is fine- it is fine then

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Old 4th January 2013, 06:33 PM   #60
ridikas is offline ridikas  United States
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Quote:
Originally Posted by voxxonline View Post
You are amazing !

Thank you for helping out with port.

BTW I am not in a hurry so if bigger diameter (and flared) port is better I can order it.
But if you say it is fine- it is fine then

(handshake)
Build with what you have first and listen. If it sounds good, leave it. If there are noises/chuffing then you can always install a flared port later.
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