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Old 5th November 2011, 08:23 PM   #1
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Smile Air velocity 2 vent diamet 4" v length 10.1"
What size passive would you substitute and with what xmax etc? I don't know how to calculate it or guess at it. 36.1 hz tuning

Could someone tell me a method?
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Old 6th November 2011, 12:34 AM   #2
Ron E is offline Ron E  United States
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Quote:
Originally Posted by joojoo1234 View Post
Could someone tell me a method?
Calculate Vd=Sd*Xmax for your woofer, your passive radiator should have at least twice the Vd of the woofer.
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Old 6th November 2011, 01:48 AM   #3
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And the box has to stay the same? I have tried modelling passives in win amp and I have not gotten a nice curve... all goofy.
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Old 6th November 2011, 09:33 AM   #4
Mikey p is offline Mikey p  Canada
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I have tried modelling passives in win amp......
Must be a sub for music.

What driver are you trying to model?
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Old 6th November 2011, 08:29 PM   #5
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Default eight inch m8a hivi
Newbie. What I am wanting to do is get down to 25 Hz in a enclosure around 15" 12" 20"
... using push pull. Passive radiator or transmission line or folded horn with the driver
Still able to cross at 100. Doable? I cannot get a passive driver flat in winked.
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Old 6th November 2011, 11:07 PM   #6
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to 25Hz with a 8" woofer with 5.8mm Xmax...

What fx are you looking for at 25Hz, F12 (-12db down)?
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Old 7th November 2011, 01:27 AM   #7
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by joojoo1234 View Post
Newbie. What I am wanting to do is get down to 25 Hz in a enclosure around 15" 12" 20"... transmission line or folded horn with the driver..Still able to cross at 100. Doable?..
FYI:

b
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Old 7th November 2011, 01:37 AM   #8
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Default I am not mentally disabled for the record.
Quote:
Originally Posted by joojoo1234 View Post
Newbie. What I am wanting to do is get down to 25 Hz in a enclosure around 15" 12" 20"
... using push pull. Passive radiator or transmission line or folded horn with the driver
Still able to cross at 100. Doable? I cannot get a passive driver flat in winked.
sentence punctuation... winked... ? This is what you get when you go to this forum from your cell phone... winisd...
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Old 7th November 2011, 02:47 AM   #9
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Quote:
Originally Posted by bjorno View Post
FYI:

b
Thanks! I am working at understanding it. Two questions. What programs are used here and am I seeing am Isobarik in a folded horn?
edit
Okay it is called hornresp... have downloaded it. Just so I am using my time correctly these graphs are saying it is possible?
I had thought of using Isobaric with a horn config... did not know if transmission line would be better but I guess you think not do to the size? Thanks again on the help... so many cool people on this forum.
Last edited by joojoo1234; 7th November 2011 at 03:15 AM.
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Old 7th November 2011, 02:49 AM   #10
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Quote:
Originally Posted by revboden View Post
to 25Hz with a 8" woofer with 5.8mm Xmax...

What fx are you looking for at 25Hz, F12 (-12db down)?
not sure... ? learning and ambitious... perhaps overly.
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