Here are your Thiele-Small parameters via BoxModel.
Bl is 9.18 Tm which I believe is the same as NA.
The numbers in the dark blue I wrote in, (I estimated 200 sq cm for the Sd), and the numbers in the light green underneath BoxModel calculates.
Neat, huh?
Bl is 9.18 Tm which I believe is the same as NA.
The numbers in the dark blue I wrote in, (I estimated 200 sq cm for the Sd), and the numbers in the light green underneath BoxModel calculates.
Neat, huh?
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planet10 said:The ApexJr Super 8 has BL measured as 2.287 lb/A.
To use Martin's model i need BL in N/A
with 1 lb-ft = 1.356 Nm and 1m = 3.281 ft i'm figuring
1 ft/A = 4.45 N/A
ie this driver has a BL of 10.175 N/A ??
dave
Should be just a case of converting pounds to newtons,
(1kg = 2.2 lbs = 9.8 newtons)
2.287 lb/A = 1.04 kg/A = 10.2 N/A.
sreten.
Hey Dave, what are you up to with this woofer ?
I meant to build something with this baby a few months ago. Time and money had me put the project to rest for a while. If I get the promotion I applied for, I guess it'll will have to wait 'til I move to my new workplace. Hopefully, I'll then have a real workshop where I can work on my speaker projects.
I meant to build something with this baby a few months ago. Time and money had me put the project to rest for a while. If I get the promotion I applied for, I guess it'll will have to wait 'til I move to my new workplace. Hopefully, I'll then have a real workshop where I can work on my speaker projects.
joensd said:Here´s a handy tool for converting quite a few units which I recently found on the net :
Useful if you are running Windows....
I downloaded an OS X ap called Balance Pro... but didn't find the lbs > Netwtons conversion till just looking now.
http://www.MacDev.ca/
dave
fireman said:what are you up to with this woofer ?
Been thinking about a push-push TL designed to push back into a corner... maybe slap a battery powered clock at the top as a disguise...
Initial numbers are coming up with an awefully small box thou.
dave
planet10 said:
Useful if you are running Windows....
I downloaded an OS X ap called Balance Pro... but didn't find the lbs > Netwtons conversion till just looking now.
http://www.MacDev.ca/
dave
Thaat's a nice little program ! I had not looked around much but this is definitely a keeper.
Dave,
MathCad will take any off-the-wall set of units that you can dream up. You do not have to be consistent with any units, length can be entered in mm and miles in the same worksheet. If you enter BL in lb/A it will immediately be converted into a consistent set of mks units. No challenge is too great for MathCad!
MathCad will take any off-the-wall set of units that you can dream up. You do not have to be consistent with any units, length can be entered in mm and miles in the same worksheet. If you enter BL in lb/A it will immediately be converted into a consistent set of mks units. No challenge is too great for MathCad!
MJK said:MathCad will take any off-the-wall set of units that you can dream up. You do not have to be consistent with any units, length can be entered in mm and miles in the same worksheet. If you enter BL in lb/A it will immediately be converted into a consistent set of mks units. No challenge is too great for MathCad!
Good reminder... at this point i've just plugged it into my spreadsheet version of your tables... the 10:1 taper line is too small for our purpose (and may not even have room to mount the drivers :^)
I also need to extrapolate the existing tables to accomodate higher Qs & Fs (1/2 the drivers i've worked with since implementing the tables don't fit into the range).
dave
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