7 Foot Sonotube = line source?

eRiCdWoNg · 28th August 2003, 11:59 PM

I reverted back to my old subwoofer since I'm having trouble integrating my new 2.5 foot sealed Tumult with my Magnepan speakers. The maggies are 6 feet high and 2 feet wide and are definately "line source" speakers. Ive tried various phase settings, crossover frequencies and room placement to no avail. My previous setup is a 12" Cerwin Vega car sub in a ported 7 foot sonotube that sits in the front right corner of the room. It is wired out of phase in relation to the speakers. Now, I find this setup integrates awesome, all around the room and at various heights. So this got me thinking. Would such a long sub like this be more of a "line source" driver then a point source? Maybe this is why its integrating better then the other? If so, im either going to stick with this setup and make a better enclosure, or make a new enclosure thats 6-7 feet high for the Tumult.

SY · 29th August 2003, 12:29 AM

It's not a line source. A line source actually emits all along the length of the line and has a 1/r amplitude dependence. What you've got is a point source and a long cabinet.

Timn8ter · 29th August 2003, 11:01 PM

What you have is a variation of a quarter wave length or transmission line subwoofer. I have a similar setup using a Shiva in a 72"x14" heavily stuffed tube. Technically, it should be longer but the stuffing seems to make up for it. The driver is downfiring and there's no cap on it.

eRiCdWoNg · 31st August 2003, 07:02 AM

Im still trying to use my Tumult but quite frankly I think this driver freakin sux. It takes so much darn power to drive and doesnt have all the performance that its cracked up to have, I havent gotten it to integrate with the Maggies (or my PA system for that matter) at all not to mention its expensive as balls.

28th August 2003, 11:59 PM	#1
eRiCdWoNg diyAudio Member Join Date: Jul 2003 Location: maryland, USA	7 Foot Sonotube = line source? I reverted back to my old subwoofer since I'm having trouble integrating my new 2.5 foot sealed Tumult with my Magnepan speakers. The maggies are 6 feet high and 2 feet wide and are definately "line source" speakers. Ive tried various phase settings, crossover frequencies and room placement to no avail. My previous setup is a 12" Cerwin Vega car sub in a ported 7 foot sonotube that sits in the front right corner of the room. It is wired out of phase in relation to the speakers. Now, I find this setup integrates awesome, all around the room and at various heights. So this got me thinking. Would such a long sub like this be more of a "line source" driver then a point source? Maybe this is why its integrating better then the other? If so, im either going to stick with this setup and make a better enclosure, or make a new enclosure thats 6-7 feet high for the Tumult.

29th August 2003, 12:29 AM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	It's not a line source. A line source actually emits all along the length of the line and has a 1/r amplitude dependence. What you've got is a point source and a long cabinet. __________________ "...we stumble and get up, we are sad, confident, insecure, feel loneliness and joy and love. There is nothing more; but I want nothing more.” - Christopher Hitchens 1949-2011

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29th August 2003, 11:01 PM	#3
Timn8ter diyAudio Member Join Date: Jul 2003 Location: Seattle, WA	What you have is a variation of a quarter wave length or transmission line subwoofer. I have a similar setup using a Shiva in a 72"x14" heavily stuffed tube. Technically, it should be longer but the stuffing seems to make up for it. The driver is downfiring and there's no cap on it.

31st August 2003, 07:02 AM	#4
eRiCdWoNg diyAudio Member Join Date: Jul 2003 Location: maryland, USA	Im still trying to use my Tumult but quite frankly I think this driver freakin sux. It takes so much darn power to drive and doesnt have all the performance that its cracked up to have, I havent gotten it to integrate with the Maggies (or my PA system for that matter) at all not to mention its expensive as balls.

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