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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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This is very interesting subject.
I expect that tghe new Midbass horns will have somewhere 108dB sensitively anechoicly. The driver is 99dB and the hyperbolic curve has much more EQ then Tractrix and that is more important the EQ that work mu...
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[quote user="oxric"]Mike duly explained to me that he would not vouch for the work of anyone not qualified and experienced with Vitavox drivers, given both the complexity of the work and the number of parts that go into making these drivers. I as...
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I'm following with interest the thread and must say that I'm baffled: Goto's "instructions" are - SIMPLY said - a mix between non-existent and wrong... I love what Goto's did in my system... BUT I think I did more with "my own" care, "my own" taste, ...
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I hate when those industry people steps out really and from facts just to maintain the faces. What would be next: they would record at +5dB digital and suggest that this type of sound cure listeners shin cancer?
Yes, Paul Stubblebine is correc...
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Dima is keep bothering me with this idea. It is not that he keep bothers – he implanted this notion into my mind and it keep bother me with the feeling that he might be very much right.
He feel that Lavry 924 is the only know to him properly implem...
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Here is a snippet from an email from Jonathan Carr (Lyra cartridge designer) about objectives and considerations regarding cartridge loading. Most of this is old news, I only re-post it here as a convenient synopsis on this most misunderstood t...
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I do not know which core and wire materials I shell need, I need to consult with my transformer people for that. As the starting point I plan to use that:
http://www.sowter.co.uk/acatalog/EQ_INDUCTORS.html
It might be good as is of I might order so...
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Ok, now it looks like the amp is operational. I was listing today the individual channels (without tweeter – the 175:1 transformer is coming). The channels do sound very promising… here are some sweeps with the filter on. All channels use well warns ...
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Within my site I many times stressed the importance of upper bass region for sound reproduction. I always said that with the improperly sounding 200Hz -400Hz any further "fidelity" of Sound becomes imposable. Ironically the 200Hz-400Hz is the most co...
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All-I'm optimizing new speakers, but the deep subject matter is a little new to me. Will this work?Using a pair of Welborne Labs DRD300B SET amps (tapped 8ohms) with a 3-way passive crossover to integrate these drivers. Here is ...
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[quote user="Teflon"]If I understand you, your amplifier uses line level frequency selection at the input to each channel, and the output of each channel is optimized for the frequency range of interest -you worry not about the performance of a chann...
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[quote user="Romy the Cat"]Actually it turned out that LE5-2/2105 are much more complicated driver and to sound right it need way more complex crossover then juts a band-pass the I initially unused. I spend some time with it today but did not find a ...
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[quote user="zako"]I did not like the two slit configuration of the phase plug..but the five to one compression ratio produced low distortion,,,but i was not impressed with its bandwidth,,,JBL also used a eight inch speaker assembled to a special...
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Chris, I have no experience with good sounding SS amplifier that might drive high sensitive horns. I also have no expertise to build such an amp. From what I trued before I have learned that in order to sound more or less acceptable the SS should run...
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[quote user="Paul S"]
I'm not sure exactly what I expected from swapping the digital cable at this point, but what I got was not it.Before I bought the Belkin Synopsis cable I just swapped out, I had sought out and purchased an Acoustic Revive cab...
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I’m glad you talk about geometry, but to respond to this I have to refer to other brands. I will only talk about facts and hope it’s not offending anybody.My basic point is: the flare rate has to be coherent right from the entrance of phase plugs. In...
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I was kind of frustrated with some strange high frequency roll off at my HF and Injection channels. It should not happen. The 9H OPT LL1627 in Injection channels should be good up to 23kHz according to my former tests with a full range Milq and the T...
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I talked for a couple of hours today with a local Solar Power technician, I sort of told him all the gear I have that would need to run on batteries and we got a shaky number; from that number he started calculating a bunch of panels and batteries a...
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Ok, can somebody to elaborate on the judgment which filter is better in case it is a corrector that acts in the middle of auditable range, let say from 1000Hz? It is the same filter but let look at the theory of judgments.
1) ...
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Actually the S2 above 8Khz, or what ‘nl’ calls the “breakup range”, is something that I absolutely certainly would like do NOT loose. I very much like what S2 at it’s 10-12Hz. It might be a bit brutal in some cases; I reported it at the beginning...
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[quote user="op.9"]Could you help me understand your biasing scheme with this version? I thought I understood the original Milq circuit - but the only channel that looks like that to me is the D channel. I don't get A and B at all! what is the 50 ohm...
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[quote user="guy sergeant"]One issue that I would consider is that the Tractrix profile supposedly does not lend itself aswell to extremely low frequency horns (being too short) as other profiles in particular the Hypex (Salmon) shape. [/quote]
Yep,...
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Somebody from AA was asking about electromagnet. The subject pup up here from time to time but this time Bruce Edgar uploaded an interesting comment. Bruce is not a typical AA Moron and if he says “inaccurate things” then it is not due to ignoran...
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[quote user="Romy the Cat"]Get RTA and set the band-pass of acoustic pressure form the channel identical. [/quote]Yes, I need to get one! Although Bruce and my tech guy both advise that the RTA may cause more problems than it solves, ...
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[quote user="Romy the Cat"]1) HF channel. A120dB-sensitive hemispheric array of compression drivers, with a dispersion approximately 180° x 230°, sitting deep in the transition slop. First order high-pass.[/quote]Hi Romy,Why such a wide angle? T...
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Romy,That upper rolloff in the OPT comes from a number of distributed capacitances and leakage inductances in the transformer - it will not be a simple filter. Lots of transformers have weird resonances up at the top of their range. In fact, some mak...
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Angelo, We should probably start a new thread to discuss horn construction in general, as this thread is about a specific aspect of that subject (driver to horn transition).To answer your question very quickly... As previously mentioned, I will ...
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HiSomething sounds very wrong - maybe something fishy about your samples?Take a look at Nelson Pass measurements towards the end of the following document:http://www.passdiy.com/pdf/KleinHorn2.pdfwhere it looks like the PTR9s have similar sensitivity...
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[quote user="serenechaos"] blah, blah, blah, all that stuff... yes, yes, I was thinking along those lines last night after I posted it, and wondering if effects of hi pass, (not just steep acoustic roll off of driver), in the amp, relieving unwan...
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I think it might be very interesting to introduce the high-pass filtration for tapped horn and to see how it behaves. It is not only about thermal overload and restriction of excursion. The unloading of none-used bass generally clean-up the transpare...
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