So I am still reading and learning, trying to pick a driver for my first project. I have been checking out the "excursion test" videos of some of the drivers I've been considering, mostly Dayton stuff. The cones on most if not all appear to be rocking from side to side. Is this just an optical illusion kind of like the wheels on a car going past appear to be spinning backwards? If this is true rocking, does this impart distortion?
Thanks
Mike
Thanks
Mike
I apologize for not being more clear. The videos on line of people testing their newly acquired subs. The Dayton RS or UM line 15 and 18.
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Maybe you should post a link of the videos you are talking about, as finding them is not that easy!
I think what you are referring to is the effect produced by CMOS CCD cameras.
They are progressive scan so distort fast moving objects.
They are progressive scan so distort fast moving objects.
That's the most likely reason for this visual effect - scan rate can't keep up with movement- especially pronounced when in sub frequencies (ie <60hz)
Can't comment on camera, etc., issues, but long throw suspensions can distort quite a bit, ditto the diaphragms if not super rigid. Tom Danley use to post a pic of him standing on the VC end of his Contrabass 15" woofer diaphragm to show how rigid it needed to be to stay pistonic over its useful BW at high power/~14 Hz.
Indeed, 'wide range' drivers rely on this somewhat to enhance HF output. Me and others have measured specific narrow HF ranges emanating off several areas of a diaphragm due to this asymmetrical? flexing.
GM
Indeed, 'wide range' drivers rely on this somewhat to enhance HF output. Me and others have measured specific narrow HF ranges emanating off several areas of a diaphragm due to this asymmetrical? flexing.
GM
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