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33 Search Results Found |
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Forum: Measurement «»
Posted on: Mon, 18 November 2024 09:35 «»
By: Wayne Parham
Re: emf in speakers
I've not really studied them but as a mental exercise, I see no way that something using charged plates to move a diaphragm would have any mechanism to make them act as a generator. However, a piezoelectric driver could generate back-EMF, essentially ac...
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Forum: Pi Speakers «»
Posted on: Tue, 03 April 2012 19:04 «»
By: Wayne Parham
Re: Crossovers - Again !!!!!!!
Conductance across the voice coil provides electrical damping. The smaller the resistance, the more damping. The most damping is created by a dead short.
Consider that the amplifier shorts the voice coil too. An amplifier with high damping factor i...
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Forum: Pi Speakers «»
Posted on: Thu, 05 May 2011 10:36 «»
By: Wayne Parham
Re: Back EMF?
Absolutely, I agree. I use mine with 10-watters and have been very happy with them on 2A3-based 2-watters too. They're fine, sound great and are quite loud.
The thing about the 2226 at low power levels is not related to Zmax or back-EMF in any w...
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Forum: Pi Speakers «»
Posted on: Thu, 05 May 2011 10:12 «»
By: Wayne Parham
Re: Back EMF?
You'll have no trouble at all driving four π speakers with that amp. They're about as tube-friendly as speakers come - very efficient and benign with respect to impedance load. Seriously, there are few other speakers that are as easy to drive.
This ...
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Forum: Pi Speakers «»
Posted on: Mon, 02 May 2011 08:10 «»
By: Wayne Parham
Re: Back EMF?
I appreciate the nod and I hope nobody was offended.
Putting personalities aside, just looking at the facts, it really isn't accurate to say a 12" or 15" woofer is more or less likely to generate greater back-EMF than a woofer with smaller c...
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Forum: Pi Speakers «»
Posted on: Sat, 23 April 2011 03:05 «»
By: Wayne Parham
Re: Back EMF?
Back-EMF is the voltage produced when the mass of motor causes it to act as a generator after the drive voltage has shut off or reversed. It is a real concern in some cases, but not in high-efficiency speakers like these. The electro-mechanical propert...
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Forum: Pi Speakers «»
Posted on: Sat, 23 April 2011 00:45 «»
By: Frihed89
Back EMF?
A local speaker guru has warned 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 proble...
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Forum: Thermionic Emissions «»
Posted on: Wed, 26 May 2010 00:38 «»
By: Thermionic
Re: Why SE in SET amps?
Welcome to ART, Pano! A great post; thank you for making this very important statement.
It's often said that "even order harmonics are good, and odd order harmonics are bad," but that stops short of telling the whole story. While it's ind...
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Forum: Pi Speakers «»
Posted on: Fri, 17 April 2009 15:56 «»
By: Wayne Parham
Electro-mechanical properties and diaphragm motion
Qms does not describe the damping of the cone. It describes damping of the suspension. This is a very important distinction. I'll try to explain, generally, some of the details and how it all works together.Motor strength and electro-mechanical paramet...
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Forum: Pi Speakers «»
Posted on: Fri, 05 January 2007 10:33 «»
By: Wayne Parham
Re: Theater 4's and DIY Tubes
It is a fine combination. I used the Paramours for a while, and found them to be fairly insensitive to load impedance, which is something that tends to be a problem with many SET amps. The parafeed output seems to swamp back-EMF effects from the woofer....
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