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Old 20th April 2004, 08:27 PM   #1
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Default Speaker Workshop question

HI

I thought that a few people on here maybe able to help me with this question but I am trying to model a JM Labs driver using Speaker workshop, specifically:

TC 120 TD5
http://www.focal.tm.fr/gb/compo/tweeter/tc120td5.htm

Audiom 6 WM
http://www.focal.tm.fr/gb/compo/midrange/a_6wm.htm

10 W 6411
http://www.focal.tm.fr/gb/compo/woofer/10w6411.htm

and I an currently trying to ensure the details for the "TC120TD5" driver are correct, my screen currently looks like the following:
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Old 20th April 2004, 08:32 PM   #2
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does this look correct ????

I am not certain about the BL, Le, L1 and R1 values compared with the specs on the JM Labs PDF document for the tweeter:

(I guess if the values are not there then they are just zero)
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Old 20th April 2004, 09:13 PM   #3
Ron E is offline Ron E  United States
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I'd say you might want to doublecheck the cone area. It looks like this is data for a tweeter, and for a 1"/25mm tweeter, the Sd should be pi*2.5^2/4 = 4.9 cm^2

BL is probably not used in any calculations (you could put in 5 or 6 if you wanted to, just to see if anything happens - or doesn't happen when it is zero - it might use BL for excursion calcs...) , and Le would be very low, like .05mH or less...

BL can be calculated from rearranging:
Qes = 2*pi*Fs*Mms*Re/(BL^2) ...and the other potential unknowns in here can be figured out from T/S parameters, so it is really dumb on the programmer's part to ask the user to input it...

L1 and R1 are factors to help model nonlinear motor inductance, which is not an important issue for tweeters in most cases....leaving them zero will be fine. You would need measurements to determine L1 and R1 for the woofers (SW determines them automatically when you do a measurement and "calculate equivalence")
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Old 21st April 2004, 03:47 AM   #4
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It looks to me that SW expects the voice coil inductance to be in Henries (H) rather than milli Henries (mH) so I expect that what you've put in for Le is about 1000 times too big!

SW has worked wonders for me.
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