Dipole-sub as BR, will it work ? - diyAudio
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Old 5th August 2009, 08:53 PM   #1
tinitus is offline tinitus  Europe
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Default Dipole-sub as BR, will it work ?

Hi

Well, it looks like bandpass
But is really only a double BR
Volume and ports are exactly alike on both front and back
Front and back port will be opposite phase

Will this double BR work as a dipole sub bass ?
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Old 6th August 2009, 04:43 AM   #2
CLS is online now CLS  Taiwan
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I think that'd be somewhat different from <just a double BR>, because the front of both drivers see nothing! And all output is projected from the ports, that tends to be a bandpass box.

What is your expectation?

Say, why not just bring in 2 BR boxes (with port on the rear), put them face to face, then you'll see what happen.
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Old 6th August 2009, 04:57 PM   #3
GM is offline GM  United States
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Hmm, a 6th order isobaric BP dipole which can be modeled in HR. The phase difference of the vent outputs when combined with the room's will dictate whether it ~cancels itself out or has any useful output. Careful though, using a 0 deg. off axis combined response only got me a :Run-time error '6', Overflow", so be forewarned.

Bottom line, for a usable BW it appears that the two chambers can't be tuned the same.

GM
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Old 6th August 2009, 04:58 PM   #4
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Quote:
Originally posted by CLS
Say, why not just bring in 2 BR boxes (with port on the rear), put them face to face, then you'll see what happen.
Works for me! Wired out of phase of course.

GM
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Old 6th August 2009, 08:51 PM   #5
tinitus is offline tinitus  Europe
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Quote:
Originally posted by GM

Hmm, a 6th order isobaric BP dipole

Bottom line, for a usable BW it appears that the two chambers can't be tuned the same.

GM

Good evaluation

I think of it more like two BR subs, rather than a BW design
Both driven by the same driver
In this case isobaric pushpull, which with the double BR ought to be a very symmetrical load, and results in a smaller box

But this only works when the ports are opposite phase, which means dipole
Question is whether it may solve some of the known problem of combining mono pole subs with OB mains
Another issue is cancelling, which I understand is worse the lower we get
And this one is supposed to work only low, so may be a major issue
I suppose the only way to find out is to build one
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