Impedance of the Vapor Audio Nimbus?

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planet10

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Impedance of the Vapor Audio Nimbus?
« on: 30 Dec 2017, 10:12 pm »
Hi,

The question of use of a SET with the Nimbus recently arose, and no impedance curve could be found to see how well matched a high output impedance SET would be with this speaker.

I wonder if someone has this measured curve?

dave

gab

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Re: Impedance of the Vapor Audio Nimbus?
« Reply #1 on: 30 Dec 2017, 10:39 pm »
Hi,

The question of use of a SET with the Nimbus recently arose, and no impedance curve could be found to see how well matched a high output impedance SET would be with this speaker.

I wonder if someone has this measured curve?

dave

Dave - PM Pete Schumacher. If he can't help you, he will know who can

http://www.audiocircle.com/index.php?action=profile;u=4797

gab

planet10

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Re: Impedance of the Vapor Audio Nimbus?
« Reply #2 on: 30 Dec 2017, 11:02 pm »
Thanx, i will.

dave

Pete Schumacher

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Re: Impedance of the Vapor Audio Nimbus?
« Reply #3 on: 30 Dec 2017, 11:26 pm »
The Nimbus impedance curve is not very flat, but that's easily fixed with a compensation network.  If you intend to use a high output impedance (low/no feedback SET) let me know and I'll work up the conjugate network you can place on the output of the amp to flatten the impedance.

planet10

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Re: Impedance of the Vapor Audio Nimbus?
« Reply #4 on: 30 Dec 2017, 11:45 pm »
The system in question is Steve’s of Empirical Audio. You may already have tuned up his XO, but he was batting zero when asked about it — he seemed to lack an understanding of the potential issue.

http://www.diyaudio.com/forums/digital-line-level/314762-dac-blind-test-audible-difference-whatsoever-post5291478.html (there are relevant posts before & after)

I will cross-post your reply so he knows to contact you. Thanx again.

dave

Pete Schumacher

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Re: Impedance of the Vapor Audio Nimbus?
« Reply #5 on: 31 Dec 2017, 12:59 am »
Steve's XO is not tweaked for use with no-feedback SETs.  However, the SET he's using has enough feedback that the small impedance swings will be well tolerated.

I am intimately familiar with Steve's SET amp.  I have a pair of the same monoblocks, as well as the schematic.  He's good to go without an impedance conjugate network.

planet10

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Re: Impedance of the Vapor Audio Nimbus?
« Reply #6 on: 31 Dec 2017, 01:51 am »
For those not also following the thread on diyAudio i replied to the same reply Peter put up on diyAudio.

http://www.diyaudio.com/forums/digital-line-level/314762-dac-blind-test-audible-difference-whatsoever-post5292905.html

Thanx again Peter.

dave