Back loaded corner horn [message #52959] |
Sun, 14 December 2008 15:57 |
xsheaffer
Messages: 6 Registered: May 2009
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Esquire |
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Hello Wayne/All, I would like to adapt Pi corner horn design to back load a full range driver. However, I don't quite understand the criteria used to calculate the geometry/spacing of the speaker cab to the wall.Wayne, could you please help me with the math behind this? Thanks!
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Re: Back loaded corner horn [message #52961 is a reply to message #52960] |
Mon, 15 December 2008 11:28 |
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Wayne Parham
Messages: 18783 Registered: January 2001
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Illuminati (33rd Degree) |
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Corner loading is pretty simple really. A corner confines the radiation pattern to eighth-space and in so doing provides 9dB DI. There are other issues to consider, such as crossover points and room modes, but those are specific to the design and the room. In the case of the π cornerhorn, the woofer and midrange are designed to overlap which reduces the floor bounce notch that would result from midhorn height. This makes the position of each important, as well as the crossover frequencies. But in the generic case of a horn placed in a trihedral corner, you can model this with Hornresp. Corner placement smooths the response and provides additonal on axis output. Again, this is highly modified by room modes, but those are room specific and so are probably a separate discussion. I suggest multiple subs for dealing with room modes, again, a different subject.
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Re: Back loaded corner horn [message #52967 is a reply to message #52961] |
Mon, 15 December 2008 15:01 |
xsheaffer
Messages: 6 Registered: May 2009
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Esquire |
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Wayne, I remember in one of your tutorial papers (which I cannot seem to locate...GRRRRR), there was a factor used to calculate the spacing from the wall that I don't understand. IIRC it used a quantity "V" times sqrt 3, but I don't recall. Old age I guess... The back loaded 1 driver approach is a little different than your Pi implementation, but I want to employ the same approach using a coupling chamber for the backwave of the one driver. The trouble is I don't have a very good understanding of the design parameters of the Pi corner horn! I am just getting started. Wayne, could you steer me toward more info? Much appreciated any help you could provide! Thanks!
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Re: JBL 2115 / Fostex F200 [message #52970 is a reply to message #52969] |
Mon, 15 December 2008 20:41 |
Chris R.
Messages: 82 Registered: May 2009
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Viscount |
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Here's a link to maybe what you are talking about. These are 6.5" drivers in a corner box with the port in the back. I hooked them up as the mains once and they needed the bass boost switch to fill the room. I have the TQWP's made with 8" fostex drivers that I like well enough.http://cerchaos.homeip.net:1280/woodworking6.html Chris
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