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In the Forum: Horn-Loaded Speakers
In the Thread: Vitavox S2 with Electromagnets

Post Subject: I am still on a fence with all of it.Posted by Romy the Cat on: 7/5/2011

Decoud,

I do reject any speculations about flux modulation in compression drivers as I do presume that it is absolutely negligible. It is like using a SS amp with ultra low output impedance, to drive a ribbon tweeter and to worry about return current from the tweeter. Yes, it will exist but the amplitude of this current will be zillion times lower of any practical level. I do not have knowledge about the amount of flux modulation but my guess that it is also negligible in compression MF driver. To convert my or my opponent gesso into fact it is necessary to put a separate coil into the gap and to measure it in real time. Be advised that it is not as simple as we care to measure only linear flux deviations from different magnets. However, there is very little linearity in the gap as most of the gaps are very close to saturation and at near saturation the change event are very non- linear. This is the field where speculation of guesses shall not take place and it shall be data. For any resourceful company that sells electromagnets it would be not hard to make measurements, interpret results and to publish data. If I care I would do it myself but I have no stimulus to do it. Do not format the same people who claim today that electromagnet is “better” because it buffers flux modulation 10 years ago claim that electromagnet are “better” because they have more magnetic force and allow to manage the Q of driver in fly. Thankfully by the efforts of my criticism and a very few other people who do not buy into hype but stick with actual data and results not one repeat this stupidity anymore. Today they “invented” new concept – buffering flux modulations. I think in context of MF compression driver it is purely imaginary fight with wind mills. I do not say that there is no good electromagnet drivers but they are good or bad has very little to do with type of the magnet they use and has more to do with OTHER factors. Since so far I am the only one known to me public figure who did the methodologically clear experiment with identical driver with both perm and electro magnet and to publish the results I feel that I have reason to express doubts when I see methodologically non-kosher tests or purely BS statements.

The Cat

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