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Old 13th July 2005, 05:15 PM   #1
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Default RS180 mtm TL

I have used Martin King's "Sections" worksheets and Mathcad 8 to model a tapered TL using PE's RS180 in an mtm arrangement. Here is the frequency response. The blue line is a reference infinite baffle. The TL response is in red.

The TL sections are provided. Disregard sections of .001" length. They were part of the format I worked within and did not want to delete them.
Tweeter height will be between 34-35" above the floor. It is loacted 10.37" below the top of the TL, at the beginning of the "open end".
The 10.8" section is the half-turn at the bottom of the cabinet.
The 4.46" section is the quarter-turn out the back.

TL length is 84.31"

The electro-mechanical values are included.

As this is my first serious attempt using these worksheets, I welcome all suggestions for improving the frequency response. I have found slightly better bass available at the expense of increased ripple. I think these are good dimensions to go with a cabinet for actual testing.

I will post a cabinet lay-out when I make a suitable one.
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Old 13th July 2005, 05:29 PM   #2
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The Frequency response:

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Old 13th July 2005, 05:34 PM   #3
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TL Sections:

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Old 13th July 2005, 05:35 PM   #4
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The electro mech's:

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Old 13th July 2005, 05:38 PM   #5
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And the baffle will be very similar to that of Jon Marsh's Modula MTM:

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Old 13th July 2005, 07:06 PM   #6
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Default newby to attachments

I'll try to adjust the attachment sizes WHEN I get my computer back. It crashed right after posting the above. I'm posting this from the computer shop.
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Old 14th July 2005, 12:02 AM   #7
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Click the image to open in full size.

This is the frequency response
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Old 14th July 2005, 12:05 AM   #8
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Click the image to open in full size.

This is the sections lay-out and stuffing schedule.
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Old 14th July 2005, 12:11 AM   #9
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And here are the electro-mechanical attributes necessary to run a simulation. Remember, as an mtm both drivers are considered in the simulation. Look at the front baffle depiction. The virtual center used here is very close to the tweeter center.
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Old 14th July 2005, 12:13 AM   #10
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Thanks for your patience. Would a moderator delete posts 2,3,4, 6 and this one?
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