Hello,
So I currently have an SB Acoustics SB23MFCL45-8 that will used in a mates car as a sub. I've gone through a 24 break in where I played a 28.5Hz (fs on the spec sheet) tone at a level that gave roughly 70% Xmax. the parameter I've measured using DATS V2 are completely different to those on the spec sheet, can anyone tell me why this might be and what I should do about it? like should I be worried that it's a bad driver or just continue with he project using the measured parameters?
Thank you,
Will
So I currently have an SB Acoustics SB23MFCL45-8 that will used in a mates car as a sub. I've gone through a 24 break in where I played a 28.5Hz (fs on the spec sheet) tone at a level that gave roughly 70% Xmax. the parameter I've measured using DATS V2 are completely different to those on the spec sheet, can anyone tell me why this might be and what I should do about it? like should I be worried that it's a bad driver or just continue with he project using the measured parameters?
Thank you,
Will
Attachments
spec-
fs 28.5Hz
Qts 0.43
Vas 1.3cu ft
fs/Qts = 66.3
test-
fs 30.3
Qts 0.42
Vas 1.95 cu ft
fs/Qts = 72.7
Your fs is slightly higher even though the speaker is softer (higher Vas). This suggests the mass is less than the speaker on the factory sheet. fs/Qts is a little higher suggesting the BL product is a little higher.
Design your box around your own measurements. It won't come out much different, but you may as well go by your own numbers.
If you are truly expecting *deep* bass (from a Six?), then add 10 or 20 grams of solder to the voice coil joint to get midrange efficiency down and extend the bottom. Again not a big difference but this is DIY.
fs 28.5Hz
Qts 0.43
Vas 1.3cu ft
fs/Qts = 66.3
test-
fs 30.3
Qts 0.42
Vas 1.95 cu ft
fs/Qts = 72.7
Your fs is slightly higher even though the speaker is softer (higher Vas). This suggests the mass is less than the speaker on the factory sheet. fs/Qts is a little higher suggesting the BL product is a little higher.
Design your box around your own measurements. It won't come out much different, but you may as well go by your own numbers.
If you are truly expecting *deep* bass (from a Six?), then add 10 or 20 grams of solder to the voice coil joint to get midrange efficiency down and extend the bottom. Again not a big difference but this is DIY.
As mentioned already your results are close. Have a look at SB's tech note on measuring T/S params to get an idea why home measurements will rarely match those done at the factory! http://www.sbacoustics.com/index.php/download_file/-/view/191/
Tony.
Tony.
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