slot port Q

audiobahnkid592 · 9th January 2009, 04:32 PM

Im planning out my next box. just want opinions. I need ~25 square inch port. would it sound any different doin a 5*5, or a 4*6 or a 3*8 inch port?

jol50 · 9th January 2009, 05:37 PM

Not that I know of, but if you are going with a high excursion sub bigger seems to work better. Well if you beat on it that is.

audiobahnkid592 · 11th January 2009, 05:05 PM

one other thing do you count the thickness of the face of the box in overall lenth? i will be posting my box design soon.

jol50 · 11th January 2009, 06:13 PM

Internal airspace should be only inside the box measure, actually minus the space the rear of sub and port takes up as well. Unless it is a pre-designed box with part size listed.

audiobahnkid592 · 11th January 2009, 09:17 PM

so port lenth is only behind the baffle?

jol50 · 11th January 2009, 10:13 PM

That was box area I must have misread. Port length is the total inside length of port from open space inside to open space outside. If you taper the ends you only count part of the taper, IIRC less than half. There are a pile of box building sites that can figure it for you, or I just use winISD.

9th January 2009, 04:32 PM	#1
audiobahnkid592 diyAudio Member Join Date: Mar 2007	slot port Q Im planning out my next box. just want opinions. I need ~25 square inch port. would it sound any different doin a 55, or a 46 or a 3*8 inch port?

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9th January 2009, 05:37 PM	#2
jol50 diyAudio Member Join Date: Nov 2007	Not that I know of, but if you are going with a high excursion sub bigger seems to work better. Well if you beat on it that is.

11th January 2009, 05:05 PM	#3
audiobahnkid592 diyAudio Member Join Date: Mar 2007	one other thing do you count the thickness of the face of the box in overall lenth? i will be posting my box design soon.

11th January 2009, 06:13 PM	#4
jol50 diyAudio Member Join Date: Nov 2007	Internal airspace should be only inside the box measure, actually minus the space the rear of sub and port takes up as well. Unless it is a pre-designed box with part size listed.

11th January 2009, 09:17 PM	#5
audiobahnkid592 diyAudio Member Join Date: Mar 2007	so port lenth is only behind the baffle?

11th January 2009, 10:13 PM	#6
jol50 diyAudio Member Join Date: Nov 2007	That was box area I must have misread. Port length is the total inside length of port from open space inside to open space outside. If you taper the ends you only count part of the taper, IIRC less than half. There are a pile of box building sites that can figure it for you, or I just use winISD.

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