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twogoodears wrote:

BTW: while in Berlin, last May, Frank Schroeder performed an interesting, provoking "blind-test" using '50s and '60 Telefunken's midrange loudspeakers (22 cm diam.), comparing FC vs. PM: almost everyone in the listening panel better ranked and appreciated the FC's - smoother, more natural, less beamy. Will read with interest any (informed) opinion concerning field-coils vs. permanent magnets comparisons.

The subject of field-coils vs. permanent magnets is well beaten at my site. I generally am not pleased how people out there cover this subject. The Frank Schroeder experiment in my view was interning but not conclusive. There was not comment how much that “50s and 60 Telefunken's midrange” driver sound off from what it shell. What it initially badly sounding driver, then what the Schroeder’s excrement would shows? Nothing in my view. The whole point is to take a good sounding driver, change the manger and to see what happen. This Von Langa guy looks like did with JBL 375 and his result  are very interesting because the 375/2440 is a very good driver with very well know performing parameters.

BTW. I did the similar experiments with my S2 driver; you might read the dairies:

http://www.romythecat.com/Forums/ShowPost.aspx?postID=1929#1929

Do not miss the linked threads from there if you want more about the field-coils and I have this subject spread all over the site. In my case I did not find the direction perspective for myself without a very substantial re-research the subject at very different level of commitment and dedication. I was not going to do it. I also do not do see anybody else do the field-coils at serious level of objectives. People out there just wind coils (thankfully it is cheaper then fix magnet), get “ANY sound” and then run and screams like idiots that because it was field-coil then the random crap that they got was the god-send Sound. Well, there is a reason why I consider that most of audio people out there are morons….

BTW, the most intelligent analysis in my view about the subject of the field-coils was exes by a “be” from Denmark. Her is his post:

http://www.RomyTheCat.com/TreeItem.aspx?PostID=10659

I feel that he is on something with it…. If you wish then bring the Wolf von Langa to the table and let him to express his view about the default 2440 vs. the 2440 with electromagnet.

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