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 Multi-Way Conventional loudspeakers with crossovers

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 25th January 2003, 05:27 PM #11 MJK   Account disabled at member's request   Join Date: Feb 2002 Location: Clifton Park, NY Dave (aka kneadle), If you go to my site and look under General Speaker Articles, you will find a short write up explaining how to model two drivers in one box using my MathCad worksheets. It explains which T/S parameters to adjust to model wiring the drivers in series or in parallel. An example is provided which should allow you to run any of the worksheets, with an equivalent driver modeled, simulating the two driver configuration.
planet10
frugal-phile(tm)
diyAudio Moderator

Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Quote:
 Originally posted by kneadle Why must the cross section double? That's the part I don't get. I'm not even sure what the PRECISE meaning of "cross section" is.
The cross-section is doubled for 2 drivers as compared to one because the Vas doubles. With a fixed line length this just happens to double the volume.

If you consider the line to be a pipe of length l, width x, and breadth y (assuming a rectangular section here). Then volume is l*x*y and the cross section is x*y.

Another way to look at it is in the classical sense. A line is defined as a function of the driver's Sd. It starts at 3 Sd and ends at 1 Sd for example. If we use 2 drivers instead of 1 then Sd is doubled and the thus the line cross-section is doubled.

dave
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 25th January 2003, 05:49 PM #13 kneadle   diyAudio Member     Join Date: Dec 2002 Location: Buffalo, NY Excellent! Thanks Halo, Planet10, MJK, Ryosho and all others, I am very well-informed, now. In due time I will propose a design solution for this TL problem. In my other post I mentioned that I wanted a challenging little project for four MCMs, and now my cup runneth over with challenge. Dave PS--where can I learn how to make a plug for the MCM 15-1855?
planet10
frugal-phile(tm)
diyAudio Moderator

Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Quote:
 Originally posted by kneadle PS--where can I learn how to make a plug for the MCM 15-1855?
Here is a drawing i did for 1855 phase plugs (made from anything you can put in a lathe). The green or blue lines are the ones to follow, the red was for reference. The grid is a 1/2 mm i believe.

If you imbed a steel washer in the base it will stick to the pole piece for temporary attachment.

I haven't actually built these yet.

dave
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