best place for ports on bipole?

AudioGeek · 7th July 2006, 03:37 PM

where is best place to put ports?

on front and back?
just front?
just back?
or at bottom firing down?

they will be a aways from wall a bit cause mid driver is in open baffle.

Thanks!

69stingray · 7th July 2006, 10:08 PM

I am guessing it does not matter as long as the port is one wavelength (of the port tuning) from the driver...but that is just a guess. I am trying to learn more about bipoles myself.

FastEddy · 7th July 2006, 10:14 PM

when in front, the driver can "couple" with the horn / vent / port at certain freq.s ... and its like the driver is pushing whole the port is sucking = wasted watts, dead sport in the response curve, etc., etc.

In back the sound pressure has to go clear around to the back of the box to "couple up" and ... at higher mid range, sound just does not travel that way = very little or no coupling.

owdi · 9th July 2006, 02:15 AM

IMO, place the port so it's pointing way from the listener, either on the back or the outside of the enclosure. There is more than just bass coming from the port, especially when the woofer covers midrange frequencies.

Dan

7th July 2006, 03:37 PM	#1
AudioGeek diyAudio Member Join Date: Jan 2004 Location: Minnesota	best place for ports on bipole? where is best place to put ports? on front and back? just front? just back? or at bottom firing down? they will be a aways from wall a bit cause mid driver is in open baffle. Thanks! __________________ It is not you... you are it.

7th July 2006, 10:08 PM	#2
69stingray diyAudio Member Join Date: Apr 2005 Location: NH	I am guessing it does not matter as long as the port is one wavelength (of the port tuning) from the driver...but that is just a guess. I am trying to learn more about bipoles myself. __________________ Audio DIY Page FOLLOWMY529.COM - Subscribe and follow the performance of my daughter's 529 College Saving Account.

7th July 2006, 10:14 PM	#3
FastEddy diyAudio Member Join Date: Jun 2006 Location: North Californie	Definately in back when in front, the driver can "couple" with the horn / vent / port at certain freq.s ... and its like the driver is pushing whole the port is sucking = wasted watts, dead sport in the response curve, etc., etc. In back the sound pressure has to go clear around to the back of the box to "couple up" and ... at higher mid range, sound just does not travel that way = very little or no coupling.

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9th July 2006, 02:15 AM	#4
owdi diyAudio Member Join Date: Sep 2003 Location: Bellevue, WA	IMO, place the port so it's pointing way from the listener, either on the back or the outside of the enclosure. There is more than just bass coming from the port, especially when the woofer covers midrange frequencies. Dan

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