PUSH-PULL SONOTUBE vs. TWO SONOTUBES? - diyAudio
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Old 28th October 2008, 06:33 PM   #1
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Default PUSH-PULL SONOTUBE vs. TWO SONOTUBES?

I am just getting started with speaker building, so my knowledge on the subject is limited for now. I am planning on getting two 18" maelstrom-x subs from diycable. What i can't decide on is if I should build one huge push-pull sonosub, utilizing both subs in one tube. Or if i should build two separate tubes for the subs.
I really like the idea of the push-pull inspired by this site..

http://www.teresaudio.com/haven/subs/subs.html (don't know if this is how to attach a link)

I will most likely be getting two more subs later one, but for now, does anyone know which of the two will produce better SQL?
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Old 4th November 2008, 11:57 PM   #2
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I would recommend 2 different tubes. As if you have one driver backwards (like in the link) it is more prone to damage. On the other hand, I would just leave it and add ported enclosure around the exposed woofer to make the negative responses a little better and more tuned on that particular sub. Or if you want both good low-midrange and bass you can make a bandpass enclosure around the exposed subwoofer. It all really depends on what you want to get out of it.
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Old 5th November 2008, 09:25 AM   #3
DorinD is offline DorinD  Romania
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I'm definitevly for push-pull mode for any ultra low bass system. Otherway you have to fight alot with box mecanical vibration which aggravates as much as you increase excursion and/or use havyer driver's membrane.
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Old 5th November 2008, 10:41 AM   #4
Thawach is offline Thawach  Thailand
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Quote:
you have to fight alot with box mecanical vibration
because this, i don't like to build it.it's not bad boy but bad box because the construction of the box is not strong i don't believe the pvc boxs are the good idea.
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Old 5th November 2008, 10:43 AM   #5
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Quote:
Originally posted by DorinD
I'm definitevly for push-pull mode for any ultra low bass system. Otherway you have to fight alot with box mecanical vibration which aggravates as much as you increase excursion and/or use havyer driver's membrane.

Not only box vibrations, but also harmonic distortion is reduced significally, much like horn loading does - at the moment I have four old 8" 20 fullrangers in a push-pull as a temporary bass/low mids (didn't sound very good in upper mids/treble) - in room they can do >100 dB @ 27 Hz, >110 dB @ 60 Hz and above with no audible distortion.
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Old 5th November 2008, 11:59 AM   #6
Thawach is offline Thawach  Thailand
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Quote:
but also harmonic distortion is reduced significally
technofreak i only agree with this QUOTE for push-pull. but the boxs that i see i don'i agree.
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Old 5th November 2008, 12:26 PM   #7
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Quote:
Originally posted by Thawach


technofreak i only agree with this QUOTE for push-pull. but the boxs that i see i don'i agree.
Well, big driver with big X-max and Mms + relatively light eclosure = bass cab possibly moving around in room. Putting 2 drivers on opposite sides of the enclosure will get rid of this problem. Or making box heavy

Though my personal preference is to get two drivers as close as possible by making a manifold-like enclosure where one driver's magnet is around 10 cm from other driver's dust cap - so that the push-pull works to higher frequencies. And also cancels the "walking bass" possibility. Minus side would be possible hump in response around 150...200 Hz.
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Old 5th November 2008, 08:10 PM   #8
DorinD is offline DorinD  Romania
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Some time ago I built a strait TL subwoofer using an heavy PVC tube (about 70kilos and 2.5meters) and 2x12inch woofers in izobaric config. (not push-pull).
It worked fine but was switched to a bandpass because of WAF and space constraints.

What I want to say in fact is: for some specific frecvencies (like 20Hz) all that animal of 70 kilos just jumped up and down about 3-4cm and maybe taked off if wasn't fixed on the place. And seeing that I promised myself that if I build again such a bass monster again, ever never make it unbalanced, only push-pull.
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