Servo PlateAmps

Bigun · 9th March 2009, 01:52 PM

I'm afraid a quick search didn't yield an answer,

I'm wondering why plate amps don't include servo control options for subs ?

I know some drivers have a separate coil to allow cone movement to be measured and fed-back to the amp etc. but in principle can't you measure the back e.m.f of the primary voice coil without any special windings and therefore achieve servo control on any driver ?

jbell · 9th March 2009, 02:38 PM

Do a patent search on acebass. Acebass is exactly servo, without the sensing coil. (aka, servo is an improvement over acebass)

a quick search came up with:
STAHL - 'Acebass' Synthesis of Loudspeaker Mechanical Parameters by Electrical Means

Bigun · 9th March 2009, 02:57 PM

perfect, thank you !

HK26147 · 9th March 2009, 02:57 PM

http://www.audioxpress.com/bksprods/products/kw-6.htm

SB and audioXpress has had numerous articles on servos.
Some also use a piezo transducer to obtain the voltage for the feedback loop.

9th March 2009, 01:52 PM	#1
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	Servo PlateAmps I'm afraid a quick search didn't yield an answer, I'm wondering why plate amps don't include servo control options for subs ? I know some drivers have a separate coil to allow cone movement to be measured and fed-back to the amp etc. but in principle can't you measure the back e.m.f of the primary voice coil without any special windings and therefore achieve servo control on any driver ? __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

9th March 2009, 02:57 PM	#3
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	perfect, thank you ! __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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9th March 2009, 02:38 PM	#2
jbell diyAudio Member Join Date: Apr 2003 Location: .	Do a patent search on acebass. Acebass is exactly servo, without the sensing coil. (aka, servo is an improvement over acebass) a quick search came up with: STAHL - 'Acebass' Synthesis of Loudspeaker Mechanical Parameters by Electrical Means

9th March 2009, 02:57 PM	#4
HK26147 diyAudio Member Join Date: Jan 2008	http://www.audioxpress.com/bksprods/products/kw-6.htm SB and audioXpress has had numerous articles on servos. Some also use a piezo transducer to obtain the voltage for the feedback loop.

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