New version of Martin King's MathCad Worksheets is coming soon! - Page 33

Henkjan · 8th October 2006, 08:59 AM

and with 2 woofs (old sheet)

Henkjan · 8th October 2006, 09:01 AM

and 2 woofs new sheet

(why can't I find how to attach more than 1 pic to a message

)

MJK · 8th October 2006, 12:08 PM

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,

GM · 8th October 2006, 01:04 PM

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.

GM

Henkjan · 8th October 2006, 06:00 PM

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?

MJK · 8th October 2006, 06:08 PM

I think it is the same effect.

Henkjan · 8th October 2006, 08:23 PM

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

MJK · 8th October 2006, 08:37 PM

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?

Henkjan · 9th October 2006, 07:54 AM

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

Henkjan · 9th October 2006, 07:56 AM

one woof

8th October 2006, 01:04 PM	#324
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	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. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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8th October 2006, 12:08 PM	#323
MJK Account disabled at member's request Join Date: Feb 2002 Location: Clifton Park, NY	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,

8th October 2006, 06:08 PM	#326
MJK Account disabled at member's request Join Date: Feb 2002 Location: Clifton Park, NY	I think it is the same effect.

8th October 2006, 08:37 PM	#328
MJK Account disabled at member's request Join Date: Feb 2002 Location: Clifton Park, NY	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?

9th October 2006, 07:54 AM	#329
Henkjan diyAudio Member Join Date: Jan 2006 Location: Berkel en Rodenrijs	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