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18 Search Results Found |
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Forum: Pi Speakers «»
Posted on: Thu, 10 July 2008 17:40 «»
By: Wayne Parham
Loudspeaker impedance curve - Zmax and tube amps
…has high damping factor (low output impedance), the impedance curve won't matter much. But amps with higher output impedance will interact with the load impedance and may cause some amplitude response fluctuation. Single-ended tube amps with no feedback…
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Forum: Pi Speakers «»
Posted on: Sun, 08 September 2002 16:50 «»
By: Wayne Parham
Impedance curves answers
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Each of those impedance curves are pretty good, really. Not a lot of fluctuation. Depending on your crossover and amp, it may or may not be an issue. If so, you can use a Zobel to counteract some of the change, specifically, the rising impedance due …
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Forum: Thermionic Emissions «»
Posted on: Fri, 04 June 2004 00:31 «»
By: Wayne Parham
Re: And an even more indepth article
…big deal. The issue of back EMF and load impedance is significant.
I think the best way to get a handle on this is to start from a simple perspective and visualize the situation, progressing to more complex attributes in steps.
1. Take a look at a…
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Forum: Speaker «»
Posted on: Mon, 11 October 2004 14:26 «»
By: Martin
Resonances!
…and how they change the driver's impedance curve. If you see a peak in th driver's impedance magnitude curve, and an accompanying rapid phase fluctuation, then this is a sure sign of a resonance of some form. The way I see it is as follows.1. Driver in…
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Forum: Pi Speakers «»
Posted on: Mon, 02 May 2011 08:10 «»
By: Wayne Parham
Re: Back EMF?
…or, the magnetic strength and the voice coil impedance.
I've measured woofers that created such strong back-EMF they actually induced current sufficient to make sound in adjacent drivers connected through a passive crossover network. This is unusual, …
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Forum: Pi Speakers «»
Posted on: Thu, 11 February 2010 21:38 «»
By: Wayne Parham
Re: 7 Pi impedance range
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It really is a nice impedance curve for tube amps, without any real peaks. It's scaled to show what little fluctuation is there, but you'll notice minimum impedance is 5Ω and max is about 13.5Ω. That's really good. Most loudspeakers have peaks of at …
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Forum: Pi Speakers «»
Posted on: Thu, 28 September 2006 20:44 «»
By: Wayne Parham
Re: Wayne - What are the fundemental differences between ....
… low power SET amps is they have high output impedance. That makes electrical damping less effective. So woofers that have low Qes will act like they have much higher Qes when a tube amp is used. Speakers generate back EMF, which is not damped by the …
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Forum: Pi Speakers «»
Posted on: Sat, 24 March 2001 01:33 «»
By: Wayne_Parham
Pi's and Tubes
…ratings. What is sometimes overlooked is impedance. This is important too because it may affect the response curve in some cases. I'm not talking about its (8 or 16 ohm) "rated impedance," although you certainly want this to match whatever …
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Forum: Pi Speakers «»
Posted on: Sat, 23 April 2011 03:05 «»
By: Wayne Parham
Re: Back EMF?
…indirect measure of this - is the maximum impedance. You don't want a tube amplifier to have a wide fluctuation in impedance. But all models of π Speakers have very benign impedance curves. I've called them "tube friendly" speakers in the …
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Forum: Pi Speakers «»
Posted on: Sun, 18 July 2010 09:20 «»
By: Wayne Parham
Re: Pi 4.5 possible?
…uot; woofer is isolated by the coil, and the impedance of that branch becomes very high in the crossover region, sort of taking it out of circuit. At low frequencies, the coil impedance becomes low enough that both woofers are in parallel with each other…
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