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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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LOW FREQUENCY DIRECT RADIATOR DRIVERS
411A –18Hz, 93dB, sealed box414A - 99dB, 30Hz, Alnico, cloth416B – Alnico, 97dB, 25Hz, cloth416C – 16” version of above with Ferrite416Z - 12" version417C – 100dB, 69Hz, Alnico, 1.3T, 12”418B – 100dB, 55Hz, Alni...
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Klaus,
The 515-8GPH were in same scale as the 515G with slightly above 35Hz resonance frequency and 103 sensitivity - a very good candidate for 60Hz horn. The 10” throat? No bolls to go for 9”, how about 8”? I’m just kidding. The throat ...
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[quote user="Romy the Cat"]Hi Romy!
The 515-8GPH were in same scale as the 515G with slightly above 35Hz resonance frequency and 103 sensitivity - a very good candidate for 60Hz horn. The 10” throat? No bolls to go for 9”, how about 8”? ...
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[quote user="jessie.dazzle"]Hi Klaus,
Spec sheet on the bass driver you plan to use here: http://www.greatplainsaudio.com/downloads/515_G.pdf
[/quote]
got it, thx. used this data to simulate in hornresponse,looks very promising. but i know...its ...
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This time also make shure that the cavities in the two versions, the alnico and the fieldcoil, have the same size and volume of cavities behind the coil in the magnet structure.In this way you make shure that it is the two magnet types you are listen...
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[quote user="Romy the Cat"]
It is my long observation that PP amps are very bad for driver with Alnico driver, they usually eat all details. The ceramic drivers however, that are ordinary are horrible for HF, are very nicely work with PP amps…[/quo...
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Well I was thinking how I can verify that my midbass drivers had sunk magnets. I can take one of the drivers off; take them apart and compare them with another of my Vitavox 15 inchers. I can measure the magnetic force in the gap and it will be objec...
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This time also make shure that the cavities in the two versions, the alnico and the fieldcoil, have the same size and volume of cavities behind the coil in the magnet structure.In this way you make shure that it is the two magnet types you are listen...
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Decoud, this is certainly the evolutionary idea, all right, that I have been turning over in my head for a while now. However, even to start with, if nothing else, there is with FC the opportunity to "dial in" flux by ear.I cannot remember when, but...
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Ah i just read your article, and its funny that i share the same believ. While you were experimenting with the telefunken field coils did you also notice that the amount of current running tru the field coil also has a great of impact on sound and re...
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[quote user="Romy the Cat"]Hi Romy!
The 515-8GPH were in same scale as the 515G with slightly above 35Hz resonance frequency and 103 sensitivity - a very good candidate for 60Hz horn. The 10” throat? No bolls to go for 9”, how about 8”? ...
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Klaus,
The 515-8GPH were in same scale as the 515G with slightly above 35Hz resonance frequency and 103 sensitivity - a very good candidate for 60Hz horn. The 10” throat? No bolls to go for 9”, how about 8”? I’m just kidding. The throat ...
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the text at cessaro homepage says following :Auch das angewandte Magnetmaterial gehört zu dem Feinsten, was jemals im Lautsprecherbau verarbeitet wurde. Alnico-Magnete (finden heute aus Kostengründen kaum noch Anwendung) und im Superhochtonbereich ei...
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[quote user="Paul S"]For the Reps I will use a 2,200 Hz notch filter for its peak[/quote]Paul, why don’t you try to fix the problem of the Reps driver instead of notching it? There is a reason for the peak and I do not consider the problem could be s...
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An FM broadcast of church bells from the major cathedrals around Sweden welcomed 2014. Blessed with holidays in my family's home in Dalarna, the miracle of a truly great room was granted. Built with logs in 1947, spruce floor, ceiling, and since th...
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well i never thought i would be opening such a pandora's box with this combination.firstly,the drivers have the plastic surrounds(whew,lucky!i know the diaphragms are potentially harder to source than the drivers)what indicators or criteria would mak...
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[quote user="Dominic"] i thought of it as soft and chalked it up to not being as strong a motor as was needed and begrudgingly accepted that perhaps 'field coil' did not mean 'powerful motor'. I'm starting to think otherwise…[/quote]
Yes, it is exac...
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[quote user="be"]This time also make shure that the cavities in the two versions, the alnico and the fieldcoil, have the same size and volume of cavities behind the coil in the magnet structure.In this way you make shure that it is the two magnet...
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This is probably the reason I can listen to EV Patrician IV in relatively small space and close to the speaker without much of fatigue. The other factor must be that it's 4- way design with narrow band-pass for each horn. EV T25 2" phenolic com...
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first post... but I recognize quite a few friends here.. so, my straight horns... I like them very much.. I built mine similar in style to what Greg B linked, but obviously much smaller.. mine are just under eight feet long (length of a sheet&nb...
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I don't know the full story of how loudspeakers went from field coils to permanent magnets. I believe that ultimately it was dictated by the price and availability of Alnico. Eventually Alnico became cheap enough to make similar or higher strength ma...
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Romy,I have seen this a few times with JBL and Altec drivers. This phenomena occurs more often in Alnico magnets than any other type of magnet. When a magnet is recharged, it is blasted with a very strong magnetic field. There is really no way to “ha...
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[quote user="Romy the Cat"]
I do not know any advantages because the fact that the sound softer. I personally believe that the electromagnets have HIGHER MOMENTUM FLUX MODULATION and that make them to “sit” slightly… or exactly what I would like t...
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In all those conversations about SET vs SS there is one important
element that is allays escapes people attention. People like or do not like
this or that type of amplifiers and they are willing to advocate their love.
What however they always for...
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I have experimented with SS/SET and now DSEP for ceramic magnet horn drivers. I will agree that ceramic drivers with SETs that I have heard being suboptimal, but after a year of DSEP, at least for my use case, I am quite content. I cannot explain it ...
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Too soon to begin in-depth descriptions, but after a good deal more work (and expense...) than I'd bargained for, it did not blow up, and there was not the all-too-usual painful silence in lieu of the first expected sounds. I admit I was as surprise...
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[quote user="Romy the Cat"]
It is my long observation that PP amps are very bad for driver with Alnico driver, they usually eat all details. The ceramic drivers however, that are ordinary are horrible for HF, are very nicely work with PP amps…[/quo...
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Decoud,Though I have a pair of 8Ms, I did some searching around for alternatives just to make sure I couldn't find something "better".Its not really a kosher approach, but my research was centered on vintage alnico drivers, origin...
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[quote user="jessie.dazzle"] Color or opacity of the material in itself means nothing; it could very well be white, pink or have leopard spots (I'm betting you'd like that!), all independent of its physical characteristics. [/quote] Of cause the colo...
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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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