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Old 9th April 2003, 09:05 PM   #51
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Quote:
Originally posted by Bricolo
so, what are you calling a classical approach?

The Short Version. Then follow the link to the more detailed approach. I do not recommend building a line using this methodology... althou if you are looking to tune the line for flattest impedance Jon has some useful info.

dave
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Old 10th April 2003, 12:35 PM   #52
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Quote:
Originally posted by planet10



The Short Version. Then follow the link to the more detailed approach. I do not recommend building a line using this methodology... althou if you are looking to tune the line for flattest impedance Jon has some useful info.

dave
IMO, this is the complicated approach


Dave, I think you can explain me:
In Augspourger's tables, what does the Qts mean? Is this the Qts of your driver, or the pipe's one?
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Old 10th April 2003, 05:41 PM   #53
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the Qts of your driver

dave
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Old 10th April 2003, 07:18 PM   #54
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Quote:
Originally posted by planet10
the Qts of your driver

dave
some things made me thinks it's the TL's Qts

cf pages 8&9 from augspurger's paper
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Old 11th April 2003, 03:14 AM   #55
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Default I like Martin's tl worksheets but . . .

I could never understand why every driver I found to input into the open end tl file always works best, for low-end output, with a very large starting line. Atleast 3 times the Sd of the driver just like Martin's Focal that the file already has inputted in it. Any body else experience this?
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Old 12th April 2003, 04:12 PM   #56
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Default Pipe Size

The old wives tales of pipe with starting cross=sections of 1.5-2 Sd just won't die. I always start a simulation session with MJK's worksheets with So=4*Sd. Occasionally a pipe will work with 3*Sd, but not often.

Augspurger's tables really only work with large drivers with low Fs. Remember that Augspurger's method assumes Fp>Fs. So, if you start with a driver Fs=45, you are going to have a Fp and F3>50Hz. By using the mass-loading concept, you can design witn Fp<Fs. For exmple, my "Peerless Pipe" has F3=38Hz, even though the driver Fs=56Hz!

(However, if you do have a large, low driver and can stand a refrigerator sized cabinet, Augspurger's method can lead to a really impressive speaker. Of course, you can always get finer detail with MJK's worksheets.)

Bottom line: Unless you are using at least a 10" driver with Fs<30Hz, forget Augspurger, and please, let's never again mention the "classical method".

Bob
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