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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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This subject of digital crossovers became quite popular during last few years and many audio-people give up and go for a simplicity and painlessness of digital crossovering. There is an army of people out there who would swear by a complete transpare...
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[quote user="cv"]Hi Romy, I dunno if you mean the C-core materials itself or the completed transformers... if the former (perhaps a poor term in this context), then http://www.elnamagnetics.com have what you are looking for. Seach for AMCC - these ar...
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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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***The proper loading value is difficult to say without knowing your system, as it is partly a preamp and ultrasonic RF issue as well as one that involves the cartridge and audible frequencies. Some cartridges have frequency abberations within ...
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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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[quote user="serenechaos"] on 3) & 4): Dave Slagle, Intact Audio, knows a LOT more about transformers than I do, and the nickle autoformers I got from him work so well, I totally trust his (and/or Jeffrey Jackson's) judgment to over my "guess...
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Hi Romy, I imagine the coupling cap in the full range melq acts as a first order high pass filter: is there any reason why one could not lower its value to raise the cutoff to a level one would otherwise redundantly need a speaker-level filter to ach...
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i am currently gathering parts for a pr. of full range melq.i would like to have the option to add a single stage to do 550 hz and up.then to switch the full range to do below 550hz.what transformer do you suggest for the high pass(i am ordering...
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Thanks for the link, Romy.Very interesting.I need to run the numbers for 150 Hz, both high and low pass, 2nd order.Cement type resistor? Mills have gone to the dogs...Variable inductance OK (it might be handy...)?Have you tried s...
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In this exalted company its probably not up to much but I've not heard anything else demo-ed that makes me want to change. :)Front end: Vista laptop with XXHighend software (best sounding bargain in Hi Fi). Fireface 400 external soundcardDAC/Pre amp:...
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[quote user="Paul S"] Fremer has just pitched these in the new Stereophile, and the online buzz is building . Isn't D'Agostino the Krell guy? If these are different than the Krell amps, then how and why ? Disclosure: I quickly dismissed the Krell...
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Ok, now it is done and it is official as I see nothing available for conceptual improvement in the crossover circuit. Interestingly this version offers the most interesting sound as well, since the circus was tune for sound, not vise-versa, it is wha...
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Just 1 attempt to explain dumb questions, then a sleeping pill:OK, mistook the interstage couplers for speaker level caps, as though all channels were single stage, and from there projected the "active" band pass at speaker level (wrong turn at ...
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Allo,Well, the divider may certainly be responsible for some softening of transients - in particualr, what values are you using there?Also, the received wisdom is that silver micas are created far from equal; no experience with them myself but I beli...
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[quote user="op.9"]I now run my 'tweeter' amp 1st order high pass at 2200hz (driving BMS 4540nd in 1500hz leCleach horn) so my impressions might have some bearing on Romy's new amps. I was playing around with operating points and components in my sin...
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[quote user="jeff1225"]Roomy,I have read the posts from two years ago on your multi-cell horns. What was the final verdict? I don't see them for sale so I assume you've kept them. I'm curious where you stand on using 18 cell horns as the main midrang...
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There might be 'rule of thumb' here, but let me explain a bit better with some specifics.I'll have a Radian CD in a 425hz horn playing 800hz up to where it starts to roll off naturally at 6db at, say, 10K. And a similar Radian taking over from there ...
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OK, good luck with your experiments. Be advised however that if you use capacitors for high-pass speaker lever crossovers then those caps need to be aged. The amplitude of this effect wary from cap to cap but all of them in one way or other would ne...
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The coupling capacitor is a first order high pass filter. I have .68 in there for there for this purpose. Obviously the slope will be shallow, so precision in the value will not be critical....
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This is our first offering; we are indeed working on another two higher priced models. One will have an additional channel on top, the other one will be front horn loaded down to 40 hz. Optional finish and colors, both for horns and supports, a...
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OK this is with a digital XO, I'm wondering whether most of you would bother to low pass a 800-10k Radian mid in a 425hz Azurahorn, which hands over to a 10K+ tweeter?I've read that playing too high for a particular horn has some sort of dissadvantag...
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Good link, Kris. What is missing in the link is the RL filters. The RC Low-pass filters are fine as the capacitors are not in the band-pass mode. It is arguable what would be better – a subtractive shunting cap or a few miles of coil in the signal p...
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Speaker vs. lineMany benefits, Paul, it was well covered at my site along with many others places.Cap vs. coilTruly huge, only this would well-worth the admission ticket of the line-level. Do not also forget that in high-pass situation a coil works a...
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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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In my idea pass labs high power amplifiers are in under average even in comparison by market average standard.it's sound xa1000 was not good and i think when a company accessed a good market for his products then start to making crap products.in my i...
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Romy, Now you mention the issues here, I am thinking about what the differences in quality might be due to. I notice that you haven't explicitly said which is better, super or regular... so think of this just as brainstorming as to why things are... ...
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Romy, You make all very good points. I probably shouldn't call the front of the driver a phasing plug, because actually the long wavelengths really don't care much about the shape of the exit, they will just pass right through...
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Listening to the horns, it seems that they indeed die somewhere below 120Hz. I was surprised, and a little disappointed that it seemed so steep. Good to hear that it's to be expected!!Yes, I'm using a 30-something-Hz 1st order high pass on them ...
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The demonstration of the WE equipment was impressive as was looking closely at how these horns were constructed. The arrangement (originally it would have been mono) was to provide the audience seated both in the stalls or circle with an evenly bala...
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Quest Components have cheap 0.68uF 950s in stock, which is what I am using (the SH50s I am driving need a high pass). I have not been able to find 2uF but have not tried Roman's idea of ringing up the factory: they should send you a couple for free w...
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