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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="jessie.dazzle"]… I do not fully understand the relationship between output impedance and diaphragm control; also I don't know what you mean by "negative impedance". Your mid-bass drivers have 15 Ohm coils; from what you write, I assume y...
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I have heard several Tannoy speakers in the past, but have never heard the quality of sound Romy has obtained with his brain child. I don't know whether it is the speakers alone or his setup which has allowed his system to enthrall so much more than ...
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My playback is specifically for ME. I am not so much interested in hearing if the trumpet player farts, but am very interested in the orchestral fabric and how players move their instruments in and out of that. Row 15, refers to my favorite row at th...
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I think that I've never experienced a pair of speakers placed to achieve the DPoLS, but once I had mine quite close since the "sound" was something special, which trascended the features of individual sounds and helped to make music an experience qui...
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There is nothing to be stunned. This is norms. You spoke with Customer Relations people. They are semi paralegal BS artist or the glorified secretaries who are clueless and not very effective. You need to talk with somebody who do actions and who is ...
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[quote user="drdna"] I am quite sure it is a ground issue, as it is noise coming from the loudspeakers regardless of source or volume. Lifting the grounds on the amplifiers… eliminates the problem. [/quote] If it so them there is no need to contact t...
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I think the third movement was the best. Mehta really took his time there and dropped the overly fast tempo of the whole work. Some moment were truly nice during that adagio. I did not hate the performance in the way how I hated some other Bruckne...
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Hello Romy,I am no power expert but here are my observations on your situation.Even though a PS Audio and others create a perfect AC sine wave this does not seem to be the answer, even for low draw front end components. It seems that some type of&nbs...
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"You need to realise that the physically larger a Transformer becomes the narrower the available bandwidth for a given construction. Due to the need to handle a lot of "magnetic bias" SE Output transformers become very large, physicall...
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Romy wrote :
"...You have too much gain in your playback for 109dB sensitivity... I used ML2 with 109dB sensitively and L2 with 12.5dB voltage divider at ML2 and I had no annoying noise at nearfiled..."
Ok so I made a couple voltage dividers fo...
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[quote user="Andy Simpson"] Also, it is a great shame if you didn't try the quartet recordings - you are missing the only interesting acoustic..... these are very illustrative regarding other issues I mentioned (constant excitation resonance for exam...
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Adrian, the neutral leg is "the" ground for any American AC-powered electrical device. The "ground" leg is +/- redundant, depending on the way the ground (or grounds) of the device in question is (are) configured. With some...
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[quote user="SearcherOfBetterSound"]Not released yet though. They are an interesting company to me and whether or not their products are acceptable to you or me or not, they at least talk about some of their experiences and knowledge and tech&nb...
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I very slowly started to convert another amp to DHT. For now I listen just left channel and in a striped down mode: no tweeter and no Injection, letting the MF to care the whole upper range. It is interesting to play different tubes in this mode. Fra...
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Rick, sure, working volltage is important. What does your inverter require in the way of current in order to produce it's rated voltage at its rated current? I can remember times when I measured "correct" voltage when the battery was functionally use...
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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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Yes, that WAS a common connector but this won't help you now. Radio Shack sold those as recently as ten years ago.Since the female side of the connectors has spring terminals there is some variability permitted in the diameter of the male contacts. I...
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Today was dark and rainy, and the electricity was much better than I have heard it for some time. Though I have not listened a lot since I did the recent changes, the parts seem to be breaking in nicely. Today I listened first to some Brahms Interm...
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I calculated the whole circuit and it looks each channel draw a total of about 3mA (could be even somewhat less). The second and third stage works like a whole and it´s very curious because I have seen this design before only in guitar amps in order ...
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Apparently, TTs are so mysterious that anything goes, as long as it's long, convoluted, and circular. Multiple DC motors "make sense" if one starts by believing that an AC motor naturally slaves to its sine wave and polarity, and that this behavior ...
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Actually, the M2-12 turned out to be a good arm. It really does Sound very good. I used it with Denon 103M and 103D. It has very “interesting” midrange in a way more interesting then SME3012 but not as dry as the SMEV. I detected just 3 limitations: ...
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Romy, I'll limit my answer to only speaker-related problems. 1) Still too bright sound. Not hard or edgy, just too much top end. My local guy suggested trying a single resistor in series, rather than an L-pad, to tone down the tweet...
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Hi,I'm new to "Romy the Cat's Home Page," was impressed when I read a thread comparison of the Lamm L1/L2 linestage, which prompted me to post here. While I'm not an electronic's wizard (gift is mechanical), audio has been part of my life, dating bac...
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Byzantine Empire and PurePower.[quote user="spytsi"] Everybody here remembers that Romy's initial acquaintance with PP products was through model 1050; at some later point he upgraded to model 2000. Since then quite a few user opinions appeared ...
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It could be my mistake or poor taste, but sometimes PA systems sound very good to me. There was one in a toilette of a restaurant playing some classical music that made me almost angry, like, how is it possible to have such a decent sound so simp...
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[quote user="steverino"]I think this only works with grossly deficient recordings. I believe Levinson chose a historical recording as his example for the reviewer. But it allows the FM Acoustics listener to spend endless hours fiddling with the contr...
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Hey Anthony,Your project is going on track (and looks like a very good track)! Just a reminder about the room acoustics. You are talking about bass frequencies which are as dependent to the room as the speaker! Before installing your speakers into y...
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Are we all in agreement that up to now "the best power" in terms of sound has been the best wall power?Maybe this has something to do with the fact that on a good day there is a LOT of current pushing the "best" wall power into a system tha...
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[quote user="miab"]I'm about to place an order for some 12AX7 tubes. The GA 12ax7 tube you mention doesn't seem to come up in my search. Is there other info regarding this tube?[/quote]I am not sure but it is possible that General Electric never ...
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One of the most pleasant things about the Purepower 2000 (PP2000) that it in contrary to any other power devise I hear it has very limited if any impact to the original sound of a playback. Somehow the PP2000 surgically removes all negative manifesta...
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