Measuring Surround of passive radiator.

[TBTL]

Hello TBTL,

Thank you for your Reply, i tried this test quicky using the mic of laptop i would hold hand in the air in the name of physics if this worked. this is what i got.

BR

Mmm, it appears this one has quite a lot of damping. Too bad, then this technique doesn't work anymore. There is not much of the expected ringing.
If you really need a number and you can live with it being inaccurate, something like 130 Hz seems to be the lowest frequency you measured.

 

[ergo]

Hello Ergo,

Could you please send me the link of the dial indicator you are refering. I dont knw if that the dial indicator adds a force to the plate too while making a meas.

Best Regards,

http://insize.com/products/tools/pdf/indicator-f/2308.pdf

Also - just found that latest version VituixCAD has also has a "Load impedance overlay", so a same method can apply.

 

[Ron E]

... my concern is not to tune the passive radiator. i am looking for a 80/20 measurement method for the Kms/Cms of the surround mini passive radiator posted.

To what end other than tuning?

BTW, I missed a bit when typing earlier: Cms*rho*c^2*Sd^2=Vas

 

[shank1207]

Hello ,
i created this setup using a Sauter digital dynamometer and a screw with of 1mm pitch.

BR