Here are some of my observations regarding the Wolf von Langa RCA 1428 replica. I long time wondered where mr. von Langa gets his phase correction elements and the diaphragm for his RCA 1428 replica. It's obvious that a niche-manufacturer such as W. von Langa doesn't have the production facilities to cast his own phase correction elements, especially since the original RCA 1428 phase correction element is a very elaborate engineering masterpiece and even nowadays very difficult to cast. Most foundries wouldn't even bother to try. Way too expensive..........
So, where does mr. von Langa get the parts? Last Friday, I figured it out, because I more or less incidently came across the B&C speaker website. This Italian manufacturer enjoys a good rep in the professional audio business. Suddenly, I clicked the B&C DCM50 2" HF driver spec sheet and when I saw the picture, I knew where mr. von Langa gets the parts he needs to complete his RCA 1428 replica.
Feel free to explore mr. von Langa's kilimanjaro-website and compare the pictures of his RCA 1428 replica with the picture of the DCM50 driver on the B&C speaker website. Besides from the magnets, the resemblance is striking. Mr. von Langa buys B&C DCM50 drivers, discards the original neodymium magnet, then cuts of the from the back of the original DCM50 protruding "cooling-fingers", in order to be able to bolt on his huge elecromagnet. Then he sells this contraption as RCA 1428 replica, which it is obviously not, it's a modified B&C DCM50 HF driver. And it costs a lot of money too. I bet that the original B&cC speakers are way cheaper than the von Langa modified ones.
Maybe it would be interesting to buy 6 B&C DCM50drivers and then leave one pair original, rebuilt one pair with field coil motors and rebuilt the last pair with alnico magnets. Then one would be able to make a precise assessment regarding the sonic differences between the magnetic circuits.
Yours sincerely, Maurice.
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