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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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[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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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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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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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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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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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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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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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="Paul S"] If Marko "needs" 3rd order, is somerthing else amiss? [/quote]It is not amiss but an area where the things should be explored. What I like about horns that they have very little ambiguity and if everything is done “properly” the...
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[quote user="NBC"]… what do you feel is the upper usable frequency limit for operating your 250Hz tractrix before any negative effects of the horn itself become evident and begin unacceptably compromising the sound…[/quote]
There is no other rules b...
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[quote user="ayebee"]I’m probably suggesting the obvious, but have you tried adjusting the crossover component values on the fundamentals and MF-channels? On the fundamentals-channel, increasing the inductor-value, and decreasing the cap, so that...
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Romy,what do you think will be the crossover points of the new system?...
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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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[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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The last nigh I stopped by in the shop of my machinist. He did not finish the MiniMe as he is keep experimenting with better glue to assemble the MiniMe enclosure. All sides are prefabricated and are ready to glue, BTW, the G10 material turned out to...
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Behringer has a 3 channel digital crossover just like what you want.Don't remember the model, but it's on their site....
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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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Bill, contact me pls. The UK guy doesn't answer and I'd be happy to buy yours. Thanks...
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I realised this morning that I have done a "not-so-standard" thing in using leftover fibreglass batts for stuffing the tubes. The batts that I have on hand are high density batts, not the low density type of fibreglass that is usually used for stuff...
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Hello Martin,Do you know the crossover points of the Vox Olimpian?Thanks!...
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El Cheapo from Japan. But very complex. With a switch for choosing different crossover points...
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