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Frostg wrote:
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Sennheiser Orpheus HE-90 with matching tube a |
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Frostg 
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 Topic: Sennheiser Orpheus HE-90 with matching tube aPosted: 29 Jul 2014 at 10:22am |
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Did anyone ever hear one of these? Maybe you Graham.  Ash maybe this could be one to compare with the AKG 1000's you have got! ;-)
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Graham Slee
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Posted: 29 Jul 2014 at 12:36pm |
No, but I once tried the voltage amp stage of a solid state power amp I was working on into some lesser Sennheiser 600 Ohm phones, and was quite amazed. I never bothered making it available because it relied on the headphones being 600 Ohms. |
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That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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Frostg
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Posted: 29 Jul 2014 at 1:28pm |
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Graham, can the proprius then be used to drive the Sen HD800 - or would they just kill them?
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Ash
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Posted: 29 Jul 2014 at 3:04pm |
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I have researched Sennheiser's "legendary" HE-90 Orpheus project quite a bit but the expense is just a joke and the headphone with specialized tube amplifier is a very bulky, heavy unit. I'm not a headphone collector nor do I buy headphones for them to be an outward manifestation of affluence or snobbery. Many regard the Orpheus very highly although I have read that some people prefer the HD800. I don't know whether the intention of the Orpheus was for a flat frequency response from an electrostatic driver or whether they were designed to have coloration that some listeners might like. I'm sure I read someone say that they compared HD800 and HE-90, to find that the HD800 had more bass (and I feel HD800 bass is at quite a natural level). If this is true, I would be very interested to hear how an optimized HD540II (or HD800) from Graham's Solo ULDE would compare with the Orpheus from its dedicated tube amplifier. I don't personally believe that the Orpheus would be much better, if at all... Don't tubes impart sonic signature to the paired headphone anyway? Plus tubes wear out in the short-term timescale so the audio would also degenerate after these components go "over the hill". Headphone driver technology is only as good as its implementation and calibration.
The AKG K1000 from Proprius would be more spacious than the Orpheus from its tube amplifer. This is because the AKG K1000 design actually allows for true "out-of-the-head" stereo imaging because there is no earcup enclosure, the drivers are actually in front of the ears and there is more volume to permit a degree of interaural crosstalk. The Orpheus, on the other hand, is designed just like a conventional headphone (drivers have enclosures that go over the ears) except that it has a very low mass diaphragm. Whether this significantly lower mass diaphragm would produce a detectable improvement in resolution, I am simply in no position of experience to say. I am curious about how much air the Orpheus diaphragms would move compared to HD540II and HD800. More air or less? I'm not sure how big a wavefront the HE-90 drivers would project.
Edited by Ash - 29 Jul 2014 at 3:10pm |
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Ash
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Posted: 29 Jul 2014 at 3:14pm |
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As for Proprius driving the HD800, I reckon they could drive them well but you may hear the very low level switched mode power supply imperfections and both preamp/Proprius volume levels would have to be set quite low to avoid damaging the HD800.
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We do not see things as they are. We see things as we are.
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Graham Slee
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Posted: 29 Jul 2014 at 6:10pm |
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I think if the volume is kept to a reasonable level - around 12 o'clock or below - the HD800 would be OK on the Proprius outputs.
What's with this low level switched mode power supply imperfections?  |
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That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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Ash
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Posted: 29 Jul 2014 at 6:20pm |
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Perhaps I underestimate the full extent of what Graham achieved with the Proprius then. I just figured that the lack of PSU1 powering the amplification chain that there would be consequences for something as sensitive as a headphone.
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