feedback for correcting speaker distortion

rx7speed · 25th September 2007, 06:02 PM

I'm trying to figure out if there is a way to design an amp to have some sort of correction for speaker caused distortion. I think velodyne had something like this at one point for their subwoofers but have no idea how to get something like this done. I know you can't fix problems like speaker flex with this but it should at least work with speakers over/undershooting or other kind of artifacts that are caused by the speaker vibration.

any idea guys on how to do this one?

PMA · 25th September 2007, 06:05 PM

It was a case in seventies and eighties, Philips. No special success.

http://www.stumpie.com/tech/mfb/

rx7speed · 25th September 2007, 06:09 PM

never heard of phillips doing it. velodyne I swear did it or something similar enough as they are the ones that gave me the idea for it. if they didn't have something to get feedback from speaker motion what is it that velodyne did close to this that involved the speaker?

and yes I know don't expect magic just more for fun, ideas, and to experiment.

PMA · 25th September 2007, 06:10 PM

acceleration sensor on the membrane.

pinkmouse · 25th September 2007, 07:04 PM

The guy I'm working for at the moment has a pair of the Phillips in his warehouse. For little bookshelves, they sound alright.

carlmart · 25th September 2007, 08:43 PM

AudioXpress magazine published a DIY article in 09/2004.

They used a dual voice coil speaker, using one VC for the feedback instead of a microphone.

But there was also a way to use the speaker cable as part of the feedback.

25th September 2007, 06:02 PM	#1
rx7speed diyAudio Member Join Date: Oct 2004	feedback for correcting speaker distortion I'm trying to figure out if there is a way to design an amp to have some sort of correction for speaker caused distortion. I think velodyne had something like this at one point for their subwoofers but have no idea how to get something like this done. I know you can't fix problems like speaker flex with this but it should at least work with speakers over/undershooting or other kind of artifacts that are caused by the speaker vibration. any idea guys on how to do this one?

25th September 2007, 07:04 PM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	The guy I'm working for at the moment has a pair of the Phillips in his warehouse. For little bookshelves, they sound alright. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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25th September 2007, 06:05 PM	#2
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	It was a case in seventies and eighties, Philips. No special success. http://www.stumpie.com/tech/mfb/

25th September 2007, 06:09 PM	#3
rx7speed diyAudio Member Join Date: Oct 2004	never heard of phillips doing it. velodyne I swear did it or something similar enough as they are the ones that gave me the idea for it. if they didn't have something to get feedback from speaker motion what is it that velodyne did close to this that involved the speaker? and yes I know don't expect magic just more for fun, ideas, and to experiment.

25th September 2007, 06:10 PM	#4
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	acceleration sensor on the membrane.

25th September 2007, 08:43 PM	#6
carlmart diyAudio Member Join Date: Mar 2001 Location: Brazil	AudioXpress magazine published a DIY article in 09/2004. They used a dual voice coil speaker, using one VC for the feedback instead of a microphone. But there was also a way to use the speaker cable as part of the feedback.

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