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In Reply to: RE: Impedance Curve For 3.7i? posted by Roger Gustavsson on August 05, 2014 at 11:53:32
Your chart is not labeled but that looks like the MMG curve? The 1K Hz@23 Ohm rise did not make my Cary Six-pacs happy. It was discovered during listening tests and in searching for the cause, the impedance curve looked like it might be the problem. Swapping out the tube amp with a solid state device completely cured the issue.
No measurements were taken to confirm my listening experience but it didn't really mater, the issue (problem with one frequency) was identified and resolved. The 3.7 curves look favorable but I have not seen data for the new series crossover and I wanted to try the Six-pacs again.
Worse case, I'll dump the Carys and put my 400WPC Mac with output transformers on the job. Did you have something to add?
Edits: 08/05/14Follow Ups:
I don't know what you mean by your amps "not being happy." If you're expecting no skewing of the response in relation to the impedance curve then you've selected the wrong amps. :) That kind of response irregularity is unavoidable/inherent when using amplifiers with high output impedance.
Most likely the 3.7i's will not have a flat impedance curve either. The only way to know is to test/plot it. It's a fairly simple procedure if you have the proper test equipment.
Cheers,
Dave.
"I don't know what you mean by your amps "not being happy."
Here's the thread: http://db.audioasylum.com/mhtml/m.html?forum=mug&n=170969&highlight=mmg+russ69&r=&search_url=%2Fcgi%2Fsearch.mpl%3Fforum%3DALL%26searchtext%3Djbls%2Findex.php%2Fadmin%2Fcategories.php%2Flogin.php
Ah yes, I think I remember that thread now. :)
My comment/suggestion to Neo also works for the stock MMG crossover too. The impedance peak can easily be leveled with a conjugate network if this is an issue with a particular power amp.
Dave.
Tube amps use to like high impedancies. 23 ohm is not very high, most conventional speakerscuse to have peaks higher than that. Some electrostatic can have very strange impedance curves. Still not very difficult for the right power amp.
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