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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: perhaps a bit more posted by transfigure on August 19, 2003 at 07:31:26:
You made some valid points.The aim of using such a formula in the first place is to minimize the dancing-the-Maggie-routine that you're trying to avoid. There is an implied precision (with the 3-decimal multipliers) in the Cardas formula that can give a false sense of accuracy. The reality is, for planars, I had found the formula only gives a very crude estimate, contrary to what the implied precision of the formula might suggest. Another caveat is the formula is valid only for a rectangular shaped room. If you have an L-shaped room, like I have, you're out of luck.
Having said that, I had done some comparisons between results derived from a computer analysis and the numbers generated using the Cardas formula for my own setup. I found the results can differ as much as 12 inches for the rear wall to speaker distance. Now that may not seem like much for a 24' long room but, when when you consider most Maggie owners would probably notice a change of sound quality for positional changes as little as one inch in any given direction, it is easy to see how approximate these results really are. I did not compare the side wall distance calculations due to the L-shaped room.
The Cardas formula would give you ball park figures if you have a perfect rectangular room with a flat ceiling. It is probably as good as any other rule of thumb I've encountered (i.e. 4 ft - 5 ft from the rear wall) for positioning planars. The implied precision may suggest higher accuracy than the formula actually merits, but I suppose it's better than having no formula at all.
Bottom line: if you use the Cardas formula for positioning planars, you still may have a lot of dancing to do.
monk
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Follow Ups
- Re: Rough Approximations - monk1 16:44:27 08/19/03 (9)
- understood. - transfigure 17:45:42 08/19/03 (8)
- Re: understood. - Mart 22:29:04 08/19/03 (7)
- what's wall-baffle bass reinforcement? <nt> - transfigure 19:45:55 08/20/03 (6)
- Re: what's wall-baffle bass reinforcement? <nt> - Mart 20:56:03 08/20/03 (5)
- is this the treatment where the speaker panel forms a triangle with the side and back walls? <nt> - transfigure 10:07:32 08/25/03 (4)
- no - Mart 10:35:18 08/25/03 (3)
- no go - transfigure 17:05:18 08/25/03 (1)
- Re: no go - Mart 20:15:27 08/25/03 (0)
- thanks. I'll give it a shot <nt> - transfigure 11:33:46 08/25/03 (0)
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