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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I think it is absolutely not need to discuss how Fostex tweeter sounds as it might sound like anything. Type of crossovering, type of amplification, type of electricity, type of loading, type of time alignment and the precision of time alignment migh...
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I was trying the drivers in my infinite baffle parody configuration and I have to admit that that all of them sounded not good. There is not even a fraction of tone that am loosing and from any other quantifiable subjective point of view the driver d...
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I do not have a final design of my back chamber. The image above is a concept that I deliver to my carpenter – we will go from there to see what we can do. I certainly would like do not overbuilt the back chamber. The notion of adjustability is very ...
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[quote user="Thomas Mayer"] I never had a lot of trouble with high transconductance tubes. I use the EC8020 a lot. [/quote]
Stefano, you might look into this EC8020. I never seen it but just looked into the datasheet and it looks very interest...
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Thanks, Paul.
I never saw this company. I did call today to the guy who run it and had longer conversation with him then I intended. Size and shape wise it was exactly what I was looking for. Unfortunately he does not do matching transformer b...
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Ok Romy thanks for advice. I will see about the loading for my shelter, and my cable to the step-up is nothing special. I am going to listen to mono only for next few weeks and see if i find the "same character of sound everywhere" syndrome! I do h...
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N-set, if you have an unused circuit in the apt., then its neutral may be an acceptable ground path (neutral stays "on" even when breaker is "off"...).Re, the phono calibration, I have expounded the SRA at length in the "Vinyl Ceremonies" thread. As ...
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Kerry, thank you for sharing your paper diaphragm idea. Very interesting. As I remember it, the Cogent diaphragm I saw (and listened to) at Steve and Rich's place was a flat disc of something like fiberglass, and it looked relatively heavy for the ap...
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[quote user="Romy the Cat"]Interesting. with sealed 280 sq feet and 8 drivers per side along a long wall you very much migh be able to use a singe 6C33C. With proper loading, good trasformer, DSET and these drivers you should be able to get bass that...
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Paul, below is the Axiom. I must say I've never heard it nor know anything about the objectives behind the amp. I've just found the topology very elegant and appealing. As far as I understand, the diodesare used for biasing rather than resistors beca...
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Well, the usual pivots are the tubes' basic current and voltage operating points. Like Romy has described many times, there is on the one hand an "optimal" convergence point at clipping. Then, there are the audible "polar" "qualities" that one gets...
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[quote user="jessie.dazzle"] I'm not entirely satisfied that this single 40Hz horn was properly loading the room, which has a cubic volume not far from what I would consider ideal for such a system …. However, the horn was sitting in the center o...
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Absolutely true; I end up breaking and rebuilding the mold (actually an internal plug) for each half of the 40Hz horns I'm currently making. Ironically, the resulting horn ends up looking like a mold.For the 115Hz horn, I managed to coax two complete...
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op.9, cv and the rest folks at the previous page.
After a long debate and consulting with multiple parties it looks like I am incline to go for nickel-iron alloy (Mu-metal) transformer in my substitution of single-stage MF amps with DHT. The objecti...
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Ok, here is what I end up with. This version is something that I am planning to give some listening, the fist listening as I this filtered down the intellectuals reasons do not listen it. The amp is fully operational, bit made as a test amp inside th...
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Paul, I've been definitely looking at the DIY CNC "market" for ideas!! Esp. regarding the frame construction.The problem is that they are happy once all the frame resonances go to 3-5Hz, so they usea lot of mass loading. Here, my airsprings resonate ...
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Not only ULF, and not only the usual "dead" audiophile drivers, and not just raw amp power. My experience suggests that direct radiator drivers from 10" diameter and under claimed "100 dB efficiency" (and - especially - in multiples) can benefit fro...
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N-set, my primary reason for trying to run tubes "conservatively" is only because that's consistently what has worked best for me over time. Or, put another way, I really like to be able to "tune" all my active gain devices according to sound. If y...
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My main comment is the observation that moving company employees like to get tipped, the more extortionate the better. So, offer them outrageous tips, say 20% of the company's bill, but ONLY if everything is handled as you wish it. Of course you wi...
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I confess that at one point I tried PM6As in 2.5 cu. ft. vented boxes. Lousy, tipped-up balance and soggy, one-note "bass", contrary to the designer's claims. The only thing good about it was that the box did not add c...
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Up to the first fold the horn is somewhat conical as seen in post #1 picture.This picture shows the exit w/ additional angle wall (making for "corner" loading).This has a greater (uncalculated) flare something like a compound CD horn.Resonant F unkno...
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I use a direct radiator monopole for below 650Hz, this is OK and I have it working well. I think that I want to control directivity so that I can stop floor/ceiling comb filtering which gives me problems of +/-6dB and more. Now I am using extra monop...
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[quote user="Rewind"] The drivers we use may be superior or inferior. As long as mine are the best I could possibly afford I can relax. I do love horns, and I can probably find quite a few errors in my signal path. If they are there the horns will am...
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Hello Romy, thank you for the answers. Your horns have a round mouth, but their profile is not spherical. That is the profile of the Avantgarde Horns you formely had - apparentyl you have anayzed them intensively, could you elaborate what problems yo...
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It is difficult to talk with audio people about Horns. It is a constraint problems, and not only in audio, when the mistakes of a specific poor implementation or a chase of a mistaken tangentional notions might shatter an entire concept. The very sam...
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ScottL,It looks like the two pics you posted are of different systems, the first being slot loaded PP, and the second (full-system) showing a "traditional" IB. You also seem to be confirming my intuitive hunch of potential sound benefits and horn ma...
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What impedance is the SPU working into? My recollection (10 years since I used one) is that it liked to see a very low impedance load. I would expect puffy, diffuse low frequencies if the impedance was too high. I do recall that it was a very 'm...
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Yes, a cheap inductive l-pad between OPT and S2 in midrange channel. Interestingly, the frequency response of the first order Lazy Ribbon is remarkably similar to a response you posted somewhere on this site of the Water Drop with third order filter...
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[quote user="anthony"]You get three octaves of horn loading and then the horn attenuates the signal at 24db/octave below the lower knee and 6dB/octave above the upper knee. So a horn with a lower knee of 42Hz will have an upper knee of about 336Hz r...
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[quote user="Paul S"]N-set, you've certainly earned the right to enjoy your gear! Again, which SUT will you use? No practical way to measure ESR, etc. on this, I suppose...[/quote]Paul, the SUT's are Pieter's Tribute MkII. I could measure this or th...
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