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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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The Aura
1808 had free air resonance at 24Hz and required enormous sealed
enclosure of 14-16 cu feet. Wilson Audio used the Aura 1808 in their
unfortunately-ported XS subwoofers and soaked from their relatively
small enclosure an extra 19dB...
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[quote user="Paul S"]Greg, I have written about my "DEBZ" speakers several times at this site, [/quote]D. Olsher's Basszilla -- of course! Sorry, Paul, I forgot.[quote user="Paul S"]If I were to do the DEBZ concept right now, I would tune the BR...
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[quote user="oxric"] I have always felt that if I went for a vertical array of 10" drivers, I would keep the drivers closer spaced than you do in your 'Dunlavy' made enclosure. Based on the 110" height of the tower, I see that you would be doing this...
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Let's say we all have a midbass horn that plays down to 80Hz. I know some of us are special, so their midbass horn plays down to 40Hz. But still.What to do for the lower frequencies? Sealed or Infinite baffle (that's two good options). Now we need a ...
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Hi there el Olyou are on the right track. (I know your post is quite old now, but I just found it today when I googled my own site).I am the one who invented the Polyepicell cones of Kea Audio.I bought the patent papers that Mr Podzus made over 60 ye...
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I spent many hours listening and experimenting, trying to change the signature of my mid-base channel. Everything that I'm trying suggest me that I am in at very right direction but I am still not server I would say freeze the system and do not t...
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[quote user="Paul S"]You have mentioned that you want a much larger enclosure for your oops unit. I was then wondering if you aim to merely broaden and/or lower resonant response or if you planned to in some way tailor resonance as it rela...
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[quote user="Romy the Cat"] CO wrote:If you havent already, why not explore the Infinite baffle concept? Or a long terminated back chamber for that matter.
Current drive should also be very good on the lower registers.
I did it. Any situation ...
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[quote user="el`Ol"]But when the frequency where the dipole acoustic short circuit "kicks in" is clearly below the Fs of the driver, everything "dipoly" that can happen are rear wall reflections with the wrong phase, and that danger is also reduced b...
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[quote user="steverino"]I agree that the published curves don't look bizarre for a box speaker. [/quote] Hmmm, I would like to note that my reference to "given topology" did not imply the "box speaker". Even a multichannel box speaker might have opt...
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[quote user="Romy the Cat"]Anyhow, I did the measurements today and what I saw shocked me. Of the ULF sections has nice 20Hz at MF level then they have +12dB at 60Hz level. That explains everything but it also absolutely clearly indicates that the se...
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I have identified a direction for my next speaker system. Whether it is a good one or not is a different topic -- I think it's a good one because I've lived with my current horn system for 10 years and have since developed an understanding of it's st...
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I have 2nd order crossover both on the upper knee of the ob bass section and on the lower knee of the midbass section. My measurements show phase response and the summed spl is as good as it can get. Have you tried the direct servo technology or do y...
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Number one, that I'd like to run by you guys due to it's simpler nature and closer to reality execution is the idea I have been thinking about. No first hand experience with any of this.Say we use something like altec 1505b multicellular horn that sh...
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I also find SET bass to be the overall best I have heard - at its best, and this has been, as you observe, when the amp is well within its comfort zone. And this seems to remain true even when Z out and speaker load "matching" are har...
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[quote user="Murataltuev"] anthony wrote:This configuration should give somewhere around 109dB @ 20Hz from 15w in room with cone movement of about +-3.5mm. That is still low excursion, and they are excellent drivers. Well, in this case, I also hav...
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[quote user="Romy the Cat"]Andy, my mind does not operate by the categories you employ, I rather think about nature of Sound not about harmonic/non-harmonic distortions. The whole subject about the distortion is intricate, not to mention that it is n...
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I have been playing around with speakers for a long time, and things started snapping when I got into horns. I have a system right now with an upperbass horn from 140 hz turned form MDF up to around 700 hz, to another horn, and another and a super t...
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[quote user="noviygera"]Number one, that I'd like to run by you guys due to it's simpler nature and closer to reality execution is the idea I have been thinking about. No first hand experience with any of this.Say we use something like altec 1505b mu...
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Hi Romy:No need to reach for your medical glossary. The medical condition that I call 'Imponderabilis Neurosis,' is only the preserve of highly disturbed individuals such as myself (Hamlet seems to have exhibited symptons which are highly indicative ...
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[quote user="haralanov"] Also instead of using electrical tape, try to seal the back of the driver with a 2mm thick sheet of microperforated tonewood and then glue a leather layer over it. Then you could also pierce multiple tiny holes in the leather...
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[quote user="Romy the Cat"] I do not think that the fluid is a big deal. I think the fluidness of the isolation is the key, I would use different liquid. In my past I tried silicon and Scotch Whisky and the result was very good. Would it be possible ...
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OK, maybe I got too zealous with the notch filter for the Reps. I aimed to bring it down 6 dB at ~2.2k Hz, using .47 mH and 10 uF against 10 Ohms for the notch, with the Reps itself at 7 Ohms. Right now, drums are too backed off, there is no "hair"...
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Yes, of course, I was using 20Hz as some reference only. It's Fs of the ScanSpeak. Tannoy is the only active speaker so all power comes (or not) from it. From your experience with Reds, where does its reasonable output end?
Like...
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Edgar, very very nice observations re the phase! Can you somehow share the movie? Shouldn't there be a second phase jump around Fs of the passive radiator?
Have you tried combining sealed subs running parallel with Dannoys? I.e. ...
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[quote user="noviygera"]Romy,What was the reason you were not happy with the last version of your midbass section? THe one with two Vitavox 15" per side. [/quote]It was not a last version
but rather a temporary test version. I used in undersized sea...
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[quote user="Murataltuev"] I understand all
disadvantages going digital.
I strongly believe that minimal influence to the signal is the most important
aspect. And influences in digital domain are usually terrible. But I'm not sure
what other...
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I want to share what I feel is a good application of an injection channel, as introduced by Romy. But this is different and also useful and i can tell you it works and very well. Of course, I do not recommend to use this application in the same exact...
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[quote user="rdrysdale"]Do you think it would be possible to find the proper location by using a smaller pair of speakers, and then substitute in the big horns? At least to get to a close position?[/quote]Absolutely not! The “points” or even the “zon...
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I've had a long-time desire to replace my Edgar 80hz midbass shells with a better performing solution. My Edgarhorns arrived in 2005, and I made incremental improvements over the years until now they have little in common with the original Edgarhorn...
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