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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I had some free time which I'd decided to waste with this "project".For some unknown to me reason (I'm an idiot when it comes to filters)the Sallen Key topology needed one more 12AX7 stage, unlikeI happily drew some posts ago. The resulting SPICE'd p...
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[quote user="jessie.dazzle"] Make sure the power switch is off, and connect the power cord.[/quote] Unless you are a republican. If you are then you need to change voltage with power switch on and power cord attached.
[quote user="jessie.dazz...
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IMO, any sonic benefits from running Lowthers stock are totally swamped by excessive, ragged response that is generally (but not steadily...) rising - a lot - toward HF. There have been many ideas for "taming the Lowther", and here is another one, b...
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Yesterday my machinist informed me that the End of Life Phonostage’s chassis will be reedy next week. So, I desisted update the power supplies of the thing replacing the FRED diodes with those no reverse/forward recovery Silicon Carbide Schottky diod...
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Romy,His website has a lot more information than that:Do lossless compressed audio formats all sound the same?http://archimago.blogspot.pt/2013/05/measurements-do-lossless-compressed.htmlDigital Filters and Impulse Response...http://archimago.blogspo...
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[quote user="Romy the Cat"] I very much doubt that we need any AC line dedicated stabilizers; even though I do feel that it is good to have more or less stable line.[/quote]Well, this is a very general statement, perhaps too general? I'd say that *pu...
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This is very interesting, Anthony. I do think that absolute polarity has own role to play. Also, do check the DC that might be sent out of your preamps, certainly with Placette and with your 10Y before the transformer. Chas it with disconnected Milq ...
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Thanks for that collection of negative information on the DSP effects on music, Romy. I'm not a contributor to your site but you always put me in wierd situations with your unusual findings. For example, I have always used a DBX digital crossover in ...
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Romy,The common mode noise will lie between 5 meg and 8meg or 8 meg to 12 meg depending upon whether it is forward or backward mode working. It does not have much to do with the 30Kilohertz.It is possibly true that one unit may have filters to keep ...
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[quote user="Romy the Cat"]If you read the very important post: http://www.GoodSoundClub.com/TreeItem.aspx?PostID=5255 then might understand that it lead to a painful research on the subject. I have ton of data now and many experiments done. If ...
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[quote user="manisandher"]This is very disappointing to hear.
But in a way, it makes little difference to me. I had decided that I would only use the PP2000 from battery power when listening to music (or making vinyl transfers to digital). I'v...
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Looks like I'm back into this again, since, all of a sudden, out of nowhere, Yoshi up and sent me his "neutered" Reps 1 drivers (he surgically removed the whizzers).I started turning my existing Basszilla components and these guys together ...
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It would be nice if somewhere exist a community of Pacific users with some kind of knowledge base about different ways to used this processor, but I think this time has gone as the HDCD time has gone… In the world of 16.44 only the HDCD was good....
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[quote user="Romy the Cat"]You decided to go with mA or are they mV against 1R resistors?
I prefer the second approach personally and I feel that I can moderate the quality
of resistor and I can’t moderate the quality of the milliampere meter coil....
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[quote user="jessie.dazzle"] Resonant frequency :
I did not try to measure it. Can anyone confirm the following : I assume this parameter is most easily determined by playing a series of tones at constant signal strength (volume setting) whi...
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Mani, it's just as likely that blow-back from the PP is getting through the Siegfried filters. This is why it is generally better to plug everything into the regenerator. Worst case is, the regenerator eats and passes its own dirt.Best regards,Paul...
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I think what they did was to put filters, maybe just a simple capacitor on the AC side to try and reduce the noise that the units inject back into the ac mains. Perhaps they were getting complaints that the units worsened the electricity noise in the...
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I am using the Celestion Axi-periodic compression driver in the KLIPSCH K402 horn which I have boosted considerably when I noticed that the top one and one-half octaves were barely working when playing music so I figured WHY NOT? and it works just f...
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Well, I normally use tube rectifier with my LC filters and, I don´t know exactly why, I haven´t had ringing problems at switching. I think could be tubes switch in a gentler way than silicon. I recommend you use an appropriated snubber circuit across...
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Romy, could it be that the sheer beauty of the Tannoy wooferwill be compromised by the insertion of any high pass filtersbetween amp and driver?...
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I had a Behringer DCX2496 that used for nothing and I think it got broken. I do not want to by another one. What I looking for is some kind cheap, no more than $100 solution that would allow be to have 4 order filters and crossover point up to 250hz...
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In loudspeaker and amplifier design we could use more channels to have better result (like 12 channel DSet concept) but i never seen any DAC/Pre to have more channels.It seems i am speaking about moronic idea but it is interesting to me think about t...
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[quote user="Romy the Cat"]Metol, Phenidone, Hydroquinonee, Glycin[/quote]Musta been a teenage thing. I never got around to experimentation with my own chemical formulas. Damn! Later on I tried using color negatives and printing wit...
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And don't underestimate the Antimode with its parametric filters. There was a discussion with audio professionals about this topic on diyaudio.com.When the filter Q is matching the Q of the room mode one also has a correction in time domain....
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I wouldn´t talk about "wrong polarity", rather about "dislike of the resulting harmonic spectrum". Wonder how the result would be with phase-correct FIR filters for the RED....
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I was asked a few days ago what I think about Zandèn new CD player and I replied that I do not think about it.
Truly, those companies produce new models each 18 month to initiate new rounds of cash extraction from clueless, deaf and blind audi...
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[quote user="Romy the Cat"][/quote]Ok, here are some thoughts that I have after the last night experiments. The tests were made with Sunfire subwoofer, wiath is bad sounding machine but excellent LF test source. The Sunfire slope wary from 3rd order...
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[quote user="Romy the Cat"]I think that amount of users out there who would be able to take advantage of HDCD filters is no higher than the amount of people who would be able to play the files with no filter at all.[/quote]Maybe.But there is a BIG di...
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My first thought on looking at your photo: "Night On Bald Mountain"! This particular set-up might work especially well for Halloween Hi-jinks!You might even install a remote-actuated "turntable" with different filters... Best regards,Paul S...
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Not to over think it, but just tossing it out there: Most tweeters/super tweeters do not have low pass filters to take care of +30 dB at 22k Hz. If your RTA uses a microphone, and your number is above the tweeter's natural output, adjusted for mic cu...
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