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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="mats"]Good start Dan!The JBL phenolic 2" driver is 2482.I would lower the crossover point as far as you dare, 300Hz or so.Now the 2226 will do what they are pretty good at.Later you will likely want to filter the 2445 around 2k.A 600Hz h...
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[quote user="hoan da ox"]Hello to all, After following the comments of Romy for some time (have learned a lot, thank you), I would like to ask a question on this subject.This circuit is built with resistors, diodes and capacitors. Could someone elabo...
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It would be you!I should have known you had researched this more than the posts revealed.I know I would not want to wrestle those drivers out of the attic, either. I figure you have replacements to use temporarily so you would not be without, but .....
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There might be 'rule of thumb' here, but let me explain a bit better with some specifics.I'll have a Radian CD in a 425hz horn playing 800hz up to where it starts to roll off naturally at 6db at, say, 10K. And a similar Radian taking over from there ...
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Good question, as usual, Decoud. No doubt it has something to do with the very unusual recording, plus my own penchant for "getting involved" in the music according to what the recording and the system will allow. It was not an LP, after all, but a ...
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It certainly seems that once sinusoidal shape gets within a certain spec range its differential effect becomes negligible. This doesn't necessarily mean that more drastic deviation of sinusoidal shape would be inaudible.The only other factors I can...
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[quote user="Merlin"]I certainly think you must use an active device for the bass/mid transition in any serious design at this level. Choice of amplifiers will be personal. I don't have the worry of output transormers.
[/quote]Don't I remember yo...
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I think most of reader get my point of the car examples. The main point is to follow the manufacture recommendation on how to use the driver. Of course, if you want to do something different, that is your choice but don't come back and blame the dr...
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agh..well.. i can see that you'd never be over for a beer and listen session, romy! not that i wouldn't invite a curmudgeon such as yourself.. but my own system might not make the cut!i just finished off a little 2 way bms/altec system (and i d...
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Romy, I have some (strong) opinions on DHTs concerning filament supplies versus specific tube types. For virtually ANY 45 triode, AC is my preferred option. Still, not all 45 triodes will be acceptable for my use, hence weeding thru many of them to ...
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This whole 833 A2 concept, given the constraints,is a no go. When driven positive, the grid equivalent resistance drops down to 1/transconductance level. For 833, being a high-gm tube,this can be as low as 100R. In order not to distort significantly ...
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Folks,A maker of Magnetics reading along has taken me privatly a little to task, it seems I was not clear enough with some of my statements, apologies.First, I seemingly stated that Amorphous material was "always iron", that was not my intention, amo...
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Hi,[quote user="Romy the Cat"]T, would you elaborate on it if you feel that it has any merit?[/quote]Really, I do not know. From my limited experience I have found that multiway active systems are very much a tuning excercise par excellance. Given th...
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Hi Cat. I run the 12AX7s just a hair over 1mA each, and the 12AU7s at 6mA. With differential pairs and bleeders, it ends up at 39mA on each +/-300V rail. That works out to 7H minimum inductance at 60Hz, using the standard formula.&n...
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No matter how often I go through it I still frequently get confused and disoriented when tubes go bad. In this case I have been integrating a new (passive) pre-amp and a new (tubed) phono stage into the system, including trying various tub...
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[quote user="serenechaos"] I do not know of importance of enemys death to this topic. [/quote]
Oh, this is a sheer pleasure but do not call that dirt enemy. He is not enemy but way beyond it, he is the person about whom I have a death-wish as ...
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Ok, spent a half of the nigh to working with my IB problem
and discovered that everything that I do now is a complete mess.
First of all the crossover that I used is not what I though
it is.
I found my old there from which I learned...
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Thank you for your answer.If I understand well, In purpose to do something realistic and good sounding. I should use at least 2 amplifiers (one for high frequencies and the GM-100 amp for low frequencies) with a tubes active filter at the inputs of e...
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First: Good on you John, so few have spent any time on core material properties. I have developed a method for passive self demagnetization in E/I core. Works a charm except that higher perm materials become harder to drive and the driver circuit beg...
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Audio Sonar Acoustic Levelling (ASAL)
As an engineer, I’ve been intrigued by the various room treatment systems out there…most of which are sound (excuse the pun). My own 4-way front-loaded playback system is very dynamic…and suitable room...
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The line level crossovers have some advantaged: they loaded into higher impedance and therefore the values of caps are smaller. Also the line level crossovers loaded against fix impedance, contrary to the speaker level and this allow writing a very e...
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ML2 is also making me hear my modified AI M3A pre-amp, not to mention I guess I could now benefit from all shielded cables. All this stuff was fine with the Wright 2A3s. Speakers: I built a version of Dick Olsher's 3-way Diamond...
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Hm, it is complicated. In context of ported enclosure (or passive radiator) it is imposable to talk seriously about the box resonance as a speaker/driver has no own sound but rather a summation of zillion resonances, aftersounds and the rest dirt tha...
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You might change your mind after you put the PP2000 into the game. Anyhow, I do not know what Bruce did with his Titans tweeter; I do not even remember it they are in time-aligned position. The EdgarHorn Titans uses Fane ST-5022 bullet tweeter. I had...
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I must have missed out on how you regulate gain to or from each or any of several "channels"/pass bands, Romy. I can remember years ago trying lots of EQ things to get "Flat Frequency Response" and finally giving up on all of it, including...
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Two basic premises:A) The concept we all operate on is: a chain of components connected between one another that pick up info from a medium, transform the info into ac and amplify that info; then, we attach speakers to the last of thes...
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[quote user="Romy the Cat"]I do not think that my “resistance” to transformer preamplifiers” has to do with audio neutrality and particularly in context of “improved audio neutrality” as I do not think that neutrality might be “improved” (though it m...
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[quote user="Romy the Cat"] A few things that juts comes to might mind regarding the Cosecant. Gordon says that it is a Passive Multibit DAC with a single Shinko Tantulum resistor “because only a resistor can be a linear device over the entire audio ...
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Amir, Romy was actually very specific about why he was critical of Melquiades/Macondo. Even in old posting, he made a point of mentioning that he very much knew what weaknesses he had. To be honest, I believe that his real motivations for change are ...
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[quote user="Romy the Cat"]
Stitch, narrative is very interesting. I never had new Meitner’s DACs. I hear it countless time and each time it was very bad sound but it was always was in context of other brainless people sound and I do not know if ...
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