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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Hey Romy,
One rather simple acoustic solution would be to use a quarter wave
stub. This is about the closest acoustic analog to an electrical notch
filter. I believe JBL used this trick in their 'Aquarius' speaker
to remove a peak in the ...
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Yes, but if you could make it broadband enough, it might function
effectively as a filter. IE, remove a broad notch from 300 to the mass
rolloff of the horn. Just thinking aloud. What about a front
compression chamber? That would seemingly be the ...
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Thanks, Greg. I considered it. This method would act like a notching (with unprofitable sonic results as we understand) but I need rather a filter, preferably a sharp one… I know it is kind of a fantasy…. The Cat ...
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Hello , Roma ! I think that you can use only a back chamber with decreased size , and a serial capacitor . I think that there are no ways besides ... Dima...
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There is a quandary that I can’t resolve.
There is a hypothetical horn-loaded chanall operating for instance flat form 100Hz to 5000Hz. Presumably I need to cut this channel off at 300Hz, very sharp-with 3-4 acoustical orders, but according to the ...
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You need to find an individual who can design series crossovers. Both JBL and Altec used these, because they sounded best. You will need to look for an individual near where you live because they will have to test the drivers as the design progresses...
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I am not completely thrilled with TwoGoodEars new crossover.
http://vinylsavor.blogspot.com/2012/01/making-of-line-level-crossover.html
First of all , Stephano has a preamp with tube out stage. The guy in his post says that the l...
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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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[quote user="Romy the Cat"]The line-level crossovers work against fixed impedance and therefore the crossover point and the time alignment does not fluctuate along with reactance of the drivers.[/quote]Okay, maybe this is a dumb question, but why wou...
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I read about Klaus Speth crossing at 6k6 and looking at the graph it seems like the absolut wrong thing to do. My first thought would be to cross at 5k first order and make use of the rolloff there. I'll have time over the weekend to hook them up to ...
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Very helpful primer. This might be a good place to elaborate a bit on approaching the task of crossover selection and testing for each driver, especially with respect to points, filter selection, steepness and other parameters one should consider. Fr...
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Thanks very much for your prompt, courteous and informative reply!My thought about the crossover design for the EdgarHorn was due to a number of things:1. This particular EdgarHorn is being sold to make way for a Cain & Cain speaker which i...
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[quote user="Romy the Cat"] Make an experiment, and I will simplify the case quite assertively. Take a typical compression driver, cross it at 800Hz, second order and load it into a proper contemporary horn (Tratrix or JMLC) of 300Hz. Listen that hor...
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Hi Romy and all,
first of all, my name is Henry, with a "Y". due to an Irish grand-grand-grand father called "O'Henry". the O' was deleted when my grand-grand father was born, due to a silly servant of registry office. :-) all my horns uses the calc...
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Jeffery, I think Romy brought up some good points about moving the crossover up. I've always wanted to push it down, to use the hf driver more as a full range unit, which is probably the wrong to go. Steve proved this to me when we ...
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[quote user="noviygera"] I want to listen to both 12db/octave and 6db/octave passive versions and see which one sounds better. And keep the one that sounds better. [/quote]Herman,
It depends what you would like to listen. If you would like to ...
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How lucky was I that I bough that digital crossover! I am think now how can I search for my crossover slope and find that this digital toy would make it very so much easy. My major concern is to make sure that some frequency anomalies that I have fo...
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How lucky I am! The Melquiades bass channel at full throttle gives me just enough gain to power my Midbass horn to the reference level of my MF channels. That is truly a very lucky thing. The biggest dilemma I am thinking now is type of the filt...
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I had in my basement Marchand X26 crossover that I use over 10 years back. Since my B-2 power amp with passive filter is being fixed I setup the stock fixed B-2 with external Marchand active crossover. I spent some time to modify the Marchand X26 bi...
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Romy, I appreciate that this is an old thread now and that you may not remember everything from your time developing these amplifiers, but I have a (hopefully) simple question about the upperbass crossover in the schematic above. All other channels ...
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[quote user="stuck.wilson"] having seen the benefits of first orders in my own application tonally AND dynamically[/quote]
It's never was my experience. A never seen any tonal distinction between first and second order and I don't think that I exper...
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Hi Roman et al!Allow me to introduce myself. I have followed with amusement Romy the Cat for many years. He is ascerbic and ultracritical, but he does know audio. We share many tastes, like the Koetsu Onyx Platinum foir instance, on...
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Today I had a promising experience. Bill is keep experimenting with his Dannoys and I was visiting him to see what's going on there, since I am still waiting for my panels and I can experience the Dannoy foreplay only valceruasly. We did a very usefu...
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Hi
I read about your very fine hornsystem on Romy´s homepage. I started now a own Hornproject and I see your crossover from “Hornfabrik”. You have so right that a good crossover is also a key for a very good hornsystem. I´m so interested on the valu...
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Romy, Radian 475be performs best over 2K. It has some distortion around 1700 Hz. I think in general that 1 inch drivers should not be used lower than 2K.I understand your point that the practical implementation is more important than a "best practice...
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and this is the huge decision.. although Steve and Rich's drivers do have the potential for extremely wide bandwidth, I feel that the first decision when designing a horn speaker is to decide how many horns and the corresponding crossover points...
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I am observing an interesting and surprising fact – I am begging to like my active Marchand crossover. I did a number of modifications to it and it looks like the parts are broken-in now – it does sound very pleasant for my ULF. I feel it is a bit to...
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OK - I agree more than not...but have difficulty putting that in words.
I'm thinking only in horns - box speakers doesn't concern me.
Still thinking.....
cheers ...
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Hey Rom etal.I'm entering into unknown and difficult to intuit territory for me.I aquired a pair of very large constant dirrectivity horns EV hr9040 a, a little while ago and i now have a pair of jbl 2420's to power em. I haven't put them to gether, ...
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[quote user="Romy the Cat"] Make an experiment, and I will simplify the case quite assertively. Take a typical compression driver, cross it at 800Hz, second order and load it into a proper contemporary horn (Tratrix or JMLC) of 300Hz. Listen that hor...
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