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33 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Thu, 24 January 2002 16:51 «»
By: Wayne Parham
Back-EMF solutions for piezos
I have never had success adding passive components around the piezo's to reduce chirping caused by back-EMF from a woofer. If the woofer makes enough back-EMF to cause the tweeter to chirp, you can't use the two together on the same output circuit.
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Forum: Pi Speakers «»
Posted on: Mon, 02 May 2011 08:10 «»
By: Wayne Parham
Re: Back EMF?
…is more or less likely to generate greater back-EMF than a woofer with smaller cone diameter. It isn't even the diameter that matters, it's the mass. And that's not the only thing that comes into play. There's the amount of mechanical damping verses …
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Forum: Pi Speakers «»
Posted on: Thu, 24 January 2002 02:28 «»
By: Wayne Parham
Don't go into clipping and check for back-EMF
…to see if this is caused by back-EMF from the woofer. Certainly, the solution is to refrain from clipping the amp. But I'd like to know if, when the woofer is decoupled from the circuit, the piezo "buzz" goes away. I've heard 'em "chirp" from back-EMF …
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Forum: Pi Speakers «»
Posted on: Tue, 03 April 2012 19:04 «»
By: Wayne Parham
Re: Crossovers - Again !!!!!!!
…notes? What is happening is the woofer's back-EMF is causing the laminations in the output transformer to vibrate. It's kind of the same thing that can cause a power transformer to buzz. At low volumes, the output circuit can handle it, but at higher …
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Forum: Pi Speakers «»
Posted on: Sat, 23 April 2011 00:45 «»
By: Frihed89
Back EMF?
…me that a 12-15" driver may produce a lot of back-EMF that amps with very poor damping factor (2A3 SET) have a hard time coping with, regardless of sensitivity.
First of all, what is back-EMF? Second, is it a problem with the 2A3 on the Four Pi…
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Forum: Speaker «»
Posted on: Sun, 10 July 2005 10:00 «»
By: stee
esafono
… as the cones IPOTETIC THEORY:The Strength back-emf lives magnetic opposite however it produces a strength back-emf (phenomenon a neglected pò, is the reaction of the trasduttore) that it is confused of 180° in comparison to the complementar they …
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Forum: Thermionic Emissions «»
Posted on: Thu, 03 June 2004 18:05 «»
By: Manualblock
Re: And an even more indepth article
…drivers. Speaker drivers are always creating back-EMF as a result of numerous resonances, many with very high Qs and long time durations. When a conventional amp clips, the source impedance seen by the driver suddenly changes, and the back-EMF is suddenly…
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Forum: Pi Speakers «»
Posted on: Mon, 22 April 2002 14:08 «»
By: Wayne Parham
Re: Theater series Four Pi
…ncy. This condition is also associated with back-EMF and amplifiers with lower damping factor are less able to control the motor; Particularly troublesome are those with greater impedance peaks, which are then creating more back-EMF.When you put a …
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Forum: Measurement «»
Posted on: Mon, 18 November 2024 09:35 «»
By: Wayne Parham
Re: emf in speakers
…act as a generator. However, a piezoelectric driver could generate back-EMF, essentially acting like a crystal microphone.
I suppose the best verification test would be to hook one up and see if you could generate a signal by moving the diaphram…
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Forum: Pi Speakers «»
Posted on: Thu, 05 May 2011 10:36 «»
By: Wayne Parham
Re: Back EMF?
…low power levels is not related to Zmax or back-EMF in any way. It's the fact that the driver was designed to handle a lot more power, and the electro-mechanical parameters shift at moderate levels. So at flea-power, the tuning of the system makes it …
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