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 5th November 2011, 08:23 PM #1 diyAudio Member   Join Date: Oct 2011 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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Join Date: Jun 2002
Location: USA, MN
Quote:
 Originally Posted by joojoo1234 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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 6th November 2011, 01:48 AM #3 diyAudio Member   Join Date: Oct 2011 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.
diyAudio Member

Join Date: Feb 2004
Quote:
 I have tried modelling passives in win amp......
Must be a sub for music.

What driver are you trying to model?

 6th November 2011, 08:29 PM #5 diyAudio Member   Join Date: Oct 2011 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.
 6th November 2011, 11:07 PM #6 diyAudio Member     Join Date: Feb 2011 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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Join Date: Mar 2005
Location: Jacobsmountain
Quote:
 Originally Posted by joojoo1234 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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diyAudio Member

Join Date: Oct 2011
I am not mentally disabled for the record.

Quote:
 Originally Posted by joojoo1234 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...

diyAudio Member

Join Date: Oct 2011
Quote:
 Originally Posted by bjorno 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.

diyAudio Member

Join Date: Oct 2011
Quote:
 Originally Posted by revboden 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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