PASS + STORM Current and/or voltage output stage ?

JLOP · 25th October 2011, 03:30 PM

Dear all

I am quite a newbie here (just a wonderful ZEN amp to feed my Tannoy GRF Rectangulars with HPD 315A coaxials speakers).
I read a review of the STORMAUDIO R-170 Revelation in a french magazine (4 900 €...).
This amp can apparently be continualy adjusted from current to voltage output stage, which says the reviewer allows a perfect match with the loudspeakers. They say that the difference in results are huge with this tuning

I would like few clarifications from you experts :
- is it really a feature or just marketing hype
- if it is a good idea, would it be possible to make some evolution of the PASS designs to test it "live", or maybe consider it in the future
- if not, how to determine if your speakers are more current or voltage oriented

Thanks in advance

JLOP · 25th October 2011, 06:01 PM

it is a french audio company
Description in french :

Stormaudio > technologie StormFocus

or english (not exhaustive, see schematic in french)
StormAudio Technology StormFocus

Thanks for your feedbacks

Jean-Louis

Nelson Pass · 26th October 2011, 06:15 PM

The idea is valid. It is unproven that high damping factor results in the best
sonic performance. Variable output impedance has been around for a long
time. You can check Rod Elliot's pages for a suitable circuit.

Lacking that, of course you can put a resistor in series with the speaker
and see what you get.

JLOP · 26th October 2011, 06:48 PM

Thank you very much Mr Pass. Dare I ask if anything on this kind in the kitchen ?

25th October 2011, 03:30 PM	#1
JLOP diyAudio Member Join Date: Sep 2011 Location: Close to Geneva - Switzerland	PASS + STORM Current and/or voltage output stage ? Dear all I am quite a newbie here (just a wonderful ZEN amp to feed my Tannoy GRF Rectangulars with HPD 315A coaxials speakers). I read a review of the STORMAUDIO R-170 Revelation in a french magazine (4 900 €...). This amp can apparently be continualy adjusted from current to voltage output stage, which says the reviewer allows a perfect match with the loudspeakers. They say that the difference in results are huge with this tuning I would like few clarifications from you experts : - is it really a feature or just marketing hype - if it is a good idea, would it be possible to make some evolution of the PASS designs to test it "live", or maybe consider it in the future - if not, how to determine if your speakers are more current or voltage oriented Thanks in advance

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25th October 2011, 06:01 PM	#2
JLOP diyAudio Member Join Date: Sep 2011 Location: Close to Geneva - Switzerland	it is a french audio company Description in french : Stormaudio > technologie StormFocus or english (not exhaustive, see schematic in french) StormAudio Technology StormFocus Thanks for your feedbacks Jean-Louis

26th October 2011, 06:15 PM	#3
Nelson Pass The one and only Join Date: Mar 2001	The idea is valid. It is unproven that high damping factor results in the best sonic performance. Variable output impedance has been around for a long time. You can check Rod Elliot's pages for a suitable circuit. Lacking that, of course you can put a resistor in series with the speaker and see what you get.

26th October 2011, 06:48 PM	#4
JLOP diyAudio Member Join Date: Sep 2011 Location: Close to Geneva - Switzerland	Thank you very much Mr Pass. Dare I ask if anything on this kind in the kitchen ?

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