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Read the Post in new Window Read the Post in Threaded view  Post #1: Vintage Altec drivers / horns lingo. by Romy the Cat on 2005-04-24 
Browse the content of the threads in new Window  Thread: Vintage Altec drivers / horns lingo. in Horn-Loaded Speakers  0 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #3: Alnico vs. Ferrite vs. throat vs. whatever. by Romy the Cat on 2008-07-01 
Browse the content of the threads in new Window  Thread: 60hz, GPA-515-8ghp horn... in Horn-Loaded Speakers  32 Replies 
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 ...

Read the Post in new Window Read the Post in Threaded view  Post #4: S2 dia. alnico.. by chaos on 2008-07-01 
Browse the content of the threads in new Window  Thread: 60hz, GPA-515-8ghp horn... in Horn-Loaded Speakers  32 Replies 
[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”?  ...

Read the Post in new Window Read the Post in Threaded view  Post #5: Throat, s2, 515g-alnico by chaos on 2008-07-01 
Browse the content of the threads in new Window  Thread: 60hz, GPA-515-8ghp horn... in Horn-Loaded Speakers  32 Replies 
[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 ...

Read the Post in new Window Read the Post in Threaded view  Post #11: SE for alnico, PP for ceramic by el`Ol on 2009-12-11 
Browse the content of the threads in new Window  Thread: SS Amplification for Compressions drivers? Sound? in Horn-Loaded Speakers  19 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #41: Electro-alnico ? by be on 2009-12-31 
Browse the content of the threads in new Window  Thread: Vitavox S2 with Electromagnets in Horn-Loaded Speakers  91 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #443: Recharging the Alnico by Romy the Cat on 2013-06-03 
Browse the content of the threads in new Window  Thread: Macondo’s Midbass Project – the grown up time. in Horn-Loaded Speakers  455 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #41: Electro-alnico ? by be on 2009-12-31 
Browse the content of the threads in new Window  Thread: Vitavox S2 with Electromagnets in Horn-Loaded Speakers  91 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #89: Bingo by Paul S on 2011-07-05 
Browse the content of the threads in new Window  Thread: Vitavox S2 with Electromagnets in Horn-Loaded Speakers  91 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #15: s2 repro field coil by thierry on 2006-12-28 
Browse the content of the threads in new Window  Thread: Vitavox S2 driver made in china in Horn-Loaded Speakers  36 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #3: Alnico vs. Ferrite vs. throat vs. whatever. by Romy the Cat on 2008-07-01 
Browse the content of the threads in new Window  Thread: 60hz, GPA-515-8ghp horn... in Horn-Loaded Speakers  32 Replies 
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 ...

Read the Post in new Window Read the Post in Threaded view  Post #4: S2 dia. alnico.. by chaos on 2008-07-01 
Browse the content of the threads in new Window  Thread: 60hz, GPA-515-8ghp horn... in Horn-Loaded Speakers  32 Replies 
[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”?  ...

Read the Post in new Window Read the Post in Threaded view  Post #6: only the tweeter in cessaro is made with cobalt magnet by angeloitacare-idiot on 2006-12-10 
Browse the content of the threads in new Window  Thread: The most promising “best” commercial speaker in Horn-Loaded Speakers  192 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #6: Vitavox s2/amphorous core interaction/idiosyncracies by mark on 2008-01-26 
Browse the content of the threads in new Window  Thread: Entry level DSET Melq? in Melquiades Amplifier  10 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #31: Do not use ribbons sooo low by haralanov on 2010-07-04 
Browse the content of the threads in new Window  Thread: The loudspeakers for a powerful SET in Audio Discussions  48 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #39: Room by mats on 2014-01-01 
Browse the content of the threads in new Window  Thread: Summary: my/your audio: year by year in Audio Discussions  45 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #42: Just trying to see what it is. by Romy the Cat on 2009-12-31 
Browse the content of the threads in new Window  Thread: Vitavox S2 with Electromagnets in Horn-Loaded Speakers  91 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #14: More about the Electromagnetas by Romy the Cat on 2006-11-15 
Browse the content of the threads in new Window  Thread: Satisfying result: the RMAF Show + Cogent in Horn-Loaded Speakers  22 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #13: Greets, Romy.. I built some 48Hz straight horns... by Jeffrey Jackson on 2005-08-14 
Browse the content of the threads in new Window  Thread: Chinese upperbass horn. in Horn-Loaded Speakers  35 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #21: Soft phenolic drivers by Wojtek on 2008-02-01 
Browse the content of the threads in new Window  Thread: Open cell foam in horns and MF drivers in Horn-Loaded Speakers  40 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #37: Re: It's not about field strength... by guy sergeant on 2005-04-15 
Browse the content of the threads in new Window  Thread: Vitavox’s S2 Survival Guide. in Horn-Loaded Speakers  123 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #58: Re: More Vitavox S2 mysteries… by JLH on 2005-05-04 
Browse the content of the threads in new Window  Thread: Vitavox’s S2 Survival Guide. in Horn-Loaded Speakers  123 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #7: Re: Earl Geddes on the field-coils.... by MochaMike on 2006-01-12 
Browse the content of the threads in new Window  Thread: Vitavox S2 with Electromagnets in Horn-Loaded Speakers  91 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #25: Feigning the 8M by jessie.dazzle on 2009-03-16 
Browse the content of the threads in new Window  Thread: Bye-Bye, Fane in Horn-Loaded Speakers  108 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #11: SE for alnico, PP for ceramic by el`Ol on 2009-12-11 
Browse the content of the threads in new Window  Thread: SS Amplification for Compressions drivers? Sound? in Horn-Loaded Speakers  19 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #15: Color does mean the things in this case. by Romy the Cat on 2011-07-01 
Browse the content of the threads in new Window  Thread: "O Vitavox, Vitavox! Wherefore art thou Vitavox?" in Horn-Loaded Speakers  22 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #37: Wow! It Actually Works! by Paul S on 2010-07-30 
Browse the content of the threads in new Window  Thread: The loudspeakers for a powerful SET in Audio Discussions  48 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #16: A stupid love by Romy the Cat on 2014-12-14 
Browse the content of the threads in new Window  Thread: SET amplifiers in Audio Discussions  30 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #17: SS->Ceramic - the only marriage made in heaven? by rowuk on 2014-12-14 
Browse the content of the threads in new Window  Thread: SET amplifiers in Audio Discussions  30 Replies 
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 ...

Read the Post in new Window Read the Post in Threaded view  Post #86: Continuing the debate…. by Romy the Cat on 2011-07-04 
Browse the content of the threads in new Window  Thread: Vitavox S2 with Electromagnets in Horn-Loaded Speakers  91 Replies 
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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