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#1 |
diyAudio Member
Join Date: Apr 2009
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I've seen some references to the idea that a bipole driver configuration can eliminate baffle step effects. I'm not seeing it.
Any driver putting out long-wavelength frequencies (compared to box dimensions) is going to radiate into 4*pi steradians. Put two drivers on the front of a box, and both are going to "creep" around in the lower frequencies and drive the whole hemisphere. Put one on the front and one on the back, and both are going to do the same thing. Am I misunderstanding the argument or is it not grounded in reality? At the end of the day, it shouldn't matter where you place a driver if the wavelengths it is sourcing are large compared to the box (baffle) dimensions. |
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#2 |
diyAudio Member
Join Date: Dec 2015
Location: Penrhyndeudraeth
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The creepage doesn't so much kill it as scare it away
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#3 |
diyAudio Member
Join Date: Nov 2003
Location: iowa
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with a big enough baffle, maybe.
Or a ringing qts (like 1.2 - 2), maybe. I had a 24" deep open baffle, dip near 280hz, peak near 140hz then seemingly nothing below. I can dig up graphs that melonhead did (before he was banned) on measurements of a 2' deep open baffle. |
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#4 |
diyAudio Member
Join Date: Dec 2015
Location: Penrhyndeudraeth
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I think there is a misunderstanding? He said bipole, not dipole.
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#5 |
diyAudio Member
Join Date: Jun 2014
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I think the reason for this idea would be that if you have 2 identical mounted on identical baffles 180 degrees opposed, then above the baffle step frequency, you would just be hearing the driver pointing at you at its full sonic output and nothing from the one pointing away, and below the baffle step frequency you would hear half the sonic output of the driver pointing at you while half "creeped" around the back and would remain unheard, and you would hear half the output of the driver facing away from you, the half that "creeped" around the back relative its front.
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#6 |
diyAudio Member
Join Date: Nov 2003
Location: iowa
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lol, yup, I was completely off base.
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#7 | |
diyAudio Member
Join Date: Apr 2009
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Quote:
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#8 | |
diyAudio Member
Join Date: Jun 2003
Location: Chamblee, Ga.
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Quote:
GM
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#9 | |
diyAudio Member
Join Date: Dec 2015
Location: Penrhyndeudraeth
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Quote:
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#10 |
diyAudio Member
Join Date: Jun 2014
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Well, there would be destructive interference between the sounde emitted by the rear and that from the front at certain frequencies, the specifics of which depend on the depth of the speaker cabinet.
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Thread | Thread Starter | Forum | Replies | Last Post |
Baffle edge diffraction vs baffle step | skogs | Multi-Way | 47 | 21st August 2016 06:15 PM |
Does open baffle suffer from baffle step? | 454Casull | Multi-Way | 15 | 19th May 2012 04:12 PM |
Baffle size and shape -> baffle step | saschagabor | Multi-Way | 1 | 14th December 2010 11:45 AM |
HI-VI B3S Center - Bipole or baffle step compensation? | owdi | Full Range | 6 | 9th December 2005 08:35 PM |
How to kill a 100Hz open baffle resonance? | Katapum | Full Range | 12 | 22nd November 2005 04:51 PM |
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