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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Hi Romy,I think you may be struggling to get 10-12db of gain out of a spud amp (the term is a play on "one tuber").... May just about get it with 6C45.... remember you will be stepping down something like 12 to 18:1 on the OPT.best case: 10db require...
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Romy,That upper rolloff in the OPT comes from a number of distributed capacitances and leakage inductances in the transformer - it will not be a simple filter. Lots of transformers have weird resonances up at the top of their range. In fact, some mak...
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R,
Little suggestion should all else fail - you could have a rudimentary phase plug machined that would give you the same (or similar) compression ratio as the original but only one annular exit path. This might preserve the driver characteristics a...
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R,Please excuse me if this is straying from the subject... feel free to move.Anyway, I was in NYC until Wednesday evening, and I assume I know what is motivating you to abandon Macondo/Melquiades in the hot summer months... what I don't understand is...
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I pretty sure we are talking the same things, ie
Phase shift = frequency dependent delay - spreads a signal out
Geometric arrival delay is linear phase - delays all frequencies equally (obviously)
I was just hypothesizing that a slightly ge...
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One thing to bear in mind with the bass horn delay - I thank Tom Danley for explaining all this a while ago - if I understand it right, a small direct radiator (ie small in relation to the wavelength - which will obviously be the case with ...
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R,
I note you calimed a fondness for certain softdomes; looks like there are some newer scanspeaks that may have the tonal qualities of your favoured types but with higher sensitivity, which will match the Focal well.
Eg: D2904 types at
http://...
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R,More interesting observations there. Your Lowther thoughts are similar to mine - I always wondered what a lower flux version would sound like, but non-horn loaded and whizzerless a la Horning. Even got round to obtaining some magnet-less motor...
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Romy, I presume this is with the new production diaphragms? Just wondering if the old ones might restore some of the youthfullness which was diminshed by the field coil?...
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Hi Romy, Splendid work - much appreciated research this!I know this is totally premature, but if you do find that you prefer the S2 as the flux is increased and hit a current limit for the coil, then you *might* get a flux benefit by using a lower ca...
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HiWell, yes, I'd seen your post, and having sampled the results, heartily agree with you. The only reason I didn't immediately return the screen was that I'd like to make a measurement to see how the response has changed, so I can compare when the la...
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AlloI had a theory that the bug screen was helping to damp horn modes/refelctions caused by a mismatch between the S2 internal flare and the horn flare rate. I have 340Hz flare JMLC horns, which may be expected to give less of a mismatch than the sma...
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A friend of mine has a motor driven variac on his test bench that auto-adjusts for fluctuations in mains voltage....cheerscv...
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Thanks for the picture Romy. I couldn't unscrew the top threaded piece myself. Perhaps I was turning it the wrong way?! Any guidance you could give on dismantling the driver would be appreciated.
Regarding the active flux modulation idea; I think yo...
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AlloI didn't say this explicitly but the audibility of the power supply might support the theories about the flux modulation being bucked by the combo of coil and PS.I mostly wanted to mention the layering idea and - ah yes, that was it: see if you c...
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Well, without any theory or gut feeling to guide us, we are flailing around. So let me tell you what my instincts tell me and you can take it or leave it.I think the main advantage of the EM is reducing flux modulation. There was a post recently by o...
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Thanks for the tips Guy...a friend of mine knows this local guy who has a stack of radios, including troughlines, and he should be able to supply me with a nicely aligned one. In the meantime, I will give classic fm another shot...Funny what yo...
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Allo Guy,Sounds like this one's an absolute steal - have you had the chance to compare it to other tuners?Best,cv...
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Allo fellas,
Yes, it is strange. There are a number of decent venues for large scale classical, the Barbican, Royal Festival Hall, opera at the Coliseum etc, but as far as I can tell, on FM, it's Radio 3 and Classic FM, the latter playing cheesy sni...
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Allo Antonio,
I think for the UK it's 2012. Also, hHere in London the only classical station worth listening to if you ask me is BBC Radio 3. So a TU-X1 and Lavry would be something of an enormous investment all things considered. I'm fairly sure we...
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You were bidding too eh? I think Romy will be keeping quiet about hot kit in future ...
Actually, while you guys are here, are there any plans to shut down analogue broadcasting in your neck of the woods? Might want to hang on to those records...
c...
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Allo,
Actually, Dave makes it perfectly clear. Take a look at the forum and FAQ at www.intactaudio.comHe puts a lot of effort in making sure the TVC is suited for the system in mind - there are custom options for those (including higher inducta...
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T,Agreed on the mumetal - it's wonderful stuff for transformers, just wish you could get it in the required core size for big outputs (well, maybe the US DoD can). Heavens know why AC spend a fortune on silver on an iron core.RE: the Slagle autoforme...
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Allo,Thanks for that - I've revisited the relevant portion of the "My playback" section and I have to say, I think I understand a lot more clearly now having a) spent time on this site and b) read the little recap in your post, which is a very cogent...
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Allo,Well, it was just a deliberately trollsome way to get you to talk about how you evaluate sound/components - obviously you've touched upon aspects of it, but it seems like you have a unified (and "evolved", to use the site's motto...
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Allo Romy,Do you not think it is time to discuss your "evaluation criteria"? Have we not approached the entire subject backwards for too long? I have to say, on the mechanical side at least (and, particularly, on every piece of s...
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Allo
Clark: I think that's a quite different analogy. I've never felt particularly comfortable in libraries at all, nice not to have to edit out noisy semi-non-essential bodily functions etc.
Yoshi: Interesting observations, which to my mind sugges...
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I dunno if any of this applies to you guys and radio, but by way of analogy, when I had a tv, I might watch (and enjoy) films that I certainly wouldn't bother with if I had to shove a tape of the same into the VCR that evening.Likewise, I've fou...
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Allo,
Couldn't agree more. The analogy I would think of is of a cartographer stuggling to earn a living after voluntarily checking himself into solitary confinement in a nuthouse...
What I'm unsure of is how many of the false prophets hav...
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There was some anniversary issue of TAS recently where the editor praised Pearson for his contributions to audio criticism, citing his creation of a standard vocabulary as a highlight.WHAT?! What better way to emaciate any independent thoug...
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