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Old 8th October 2006, 09:59 AM   #321
Henkjan is offline Henkjan  Netherlands
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and with 2 woofs (old sheet)
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Old 8th October 2006, 10:01 AM   #322
Henkjan is offline Henkjan  Netherlands
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and 2 woofs new sheet

(why can't I find how to attach more than 1 pic to a message )
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Old 8th October 2006, 01:08 PM   #323
MJK is offline MJK  United States
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Henkjan,

I get the same type of results when I compare the old worksheets (dated 12/03) with the new ones. This is caused by a change in the damping correlation for very lightly stuffed pipes. A few years ago I found my original fiber damping correlation could be improved and that for an empty TL it was under predicting the response I was measuring. When you add stuffing the old and the new worksheets should be much closer.

Hope that helps,
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Old 8th October 2006, 02:04 PM   #324
GM is online now GM  United States
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Greets!

I noticed that the infinite baffle midbass response changes between one and two drivers implying that 'Le' is unchanged rather than halved when two are wired in parallel. IOW they should be the same except offset by ~6 dB, which of course affects your TL's response.

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Old 8th October 2006, 07:00 PM   #325
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally posted by MJK
Henkjan,

I get the same type of results when I compare the old worksheets (dated 12/03) with the new ones. This is caused by a change in the damping correlation for very lightly stuffed pipes. A few years ago I found my original fiber damping correlation could be improved and that for an empty TL it was under predicting the response I was measuring. When you add stuffing the old and the new worksheets should be much closer.

Hope that helps,
OK, thanks

but how about the difference in the 1 and 2 woofs?
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Old 8th October 2006, 07:08 PM   #326
MJK is offline MJK  United States
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I think it is the same effect.
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Old 8th October 2006, 09:23 PM   #327
Henkjan is offline Henkjan  Netherlands
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Quote:
Originally posted by Henkjan
.....

another thing I noticed: when setting the parameters for 2 drivers in paralel (so: Sd double, Vas double, Re halved) the response changes quite a bit
I meant this, it's similar in both versions
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Old 8th October 2006, 09:37 PM   #328
MJK is offline MJK  United States
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You have lost me, I am not sure what the question is all about. Can you repost the two curves you are looking at, the driver parameters entered for each, and the enclosure parameters for each enclosure and then re ask the question?
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Old 9th October 2006, 08:54 AM   #329
Henkjan is offline Henkjan  Netherlands
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what I did was 2 simulations, one with a single driver, one with two drivers. parameters adjusted as per your paper, cabinet made double cross-section. I expected the same output, but that was not the case. I will send you the mathcad file by mail when I get home
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Old 9th October 2006, 08:56 AM   #330
Henkjan is offline Henkjan  Netherlands
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one woof
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