Measuring speaker after they are built

ostie01 · 23rd April 2006, 06:57 AM

Hi, just would like to know which method you use to calibrate or fine tune your bass reflex speaker after they are built.There's lot of information before the building but when the project is finish,not much. How can I be sure if all the math I've done before will be the best for the finish product.Is it better to cut bellow, equal or above FS.What is the best way to be sure that the vent is cut to the right lenght or is too long or too short other than my ears.Thanks

e-side · 23rd April 2006, 08:57 AM

This can be done by measuring the impedance of the system. In case of a Bass-Reflex enclosure, at the system's resonant frequency (Fb) impedance should be at a minimum level. When your measured resonant frequency's near the predicted/calculated Fb, then you built your design as intended.

See this site for the procedure for impedance measurements. No cross-over should be connected when measuring.

tschrama · 23rd April 2006, 04:05 PM

don't forget to measure the THD too

claudio · 23rd April 2006, 04:38 PM

Hi,
in my home page is illustrated how to measure the finished speaker, and how to check its resonance frequency as well as other things, through the impedance response.
I hope it helps.

Regards,
Claudio

23rd April 2006, 06:57 AM	#1
ostie01 diyAudio Member Join Date: Mar 2005 Location: quebec	Measuring speaker after they are built Hi, just would like to know which method you use to calibrate or fine tune your bass reflex speaker after they are built.There's lot of information before the building but when the project is finish,not much. How can I be sure if all the math I've done before will be the best for the finish product.Is it better to cut bellow, equal or above FS.What is the best way to be sure that the vent is cut to the right lenght or is too long or too short other than my ears.Thanks

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23rd April 2006, 08:57 AM	#2
e-side diyAudio Member Join Date: Jun 2005 Location: The Netherlands	This can be done by measuring the impedance of the system. In case of a Bass-Reflex enclosure, at the system's resonant frequency (Fb) impedance should be at a minimum level. When your measured resonant frequency's near the predicted/calculated Fb, then you built your design as intended. See this site for the procedure for impedance measurements. No cross-over should be connected when measuring.

23rd April 2006, 04:05 PM	#3
tschrama diyAudio Member Join Date: Jul 2001 Location: The Netherlands	don't forget to measure the THD too

23rd April 2006, 04:38 PM	#4
claudio diyAudio Member Join Date: Feb 2002 Location: Italy	Hi, in my home page is illustrated how to measure the finished speaker, and how to check its resonance frequency as well as other things, through the impedance response. I hope it helps. Regards, Claudio

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