7 Foot Sonotube = line source? - diyAudio
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Old 28th August 2003, 10:59 PM   #1
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Default 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.
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Old 28th August 2003, 11:29 PM   #2
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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.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 29th August 2003, 10:01 PM   #3
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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.
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Old 31st August 2003, 06:02 AM   #4
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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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