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BEC last won the day on January 27 2014

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About BEC

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  1. I thought I would go ahead and post the test results after changing out the autotransformer. So you can compare them next to each other, I will post one of the crossover with the T3A and one of the crossover after just changing the autotransformer.
  2. I did not listen to them. I can say with certainty that I would not like the midrange recessed that far back behind the bass and treble. I like hearing the midrange at the same level as the other two drivers.
  3. Problem solved. It is the T3A autotransformers, both of them (perhaps all of them). I replaced with a pair of mine and the spike is gone. No use asking me to explain this. I have no idea.
  4. The story I heard was that the prototypes of the K-55Ms had higher output, so the crossover was made compensate for that. Then the actual production models showed up and did not have the higher output. But anyway, I did my own testing and pronounced all to be essentially equal.
  5. That is probably where I will go next. Tomorrow, not tonight.
  6. But it turned out not to be more efficient than the K-55V.
  7. Yes, as long as the change is not by a large amount (like the case I was asking myself about earlier) depending on the type of crossover. This is complicated and one needs to read the thread (that I can't find right now). I hope that is adequately confusing.
  8. Answer: No, that is not it.
  9. Question to myself. Could I be seeing something similar to what I saw on a crossover that Dean built some time ago?
  10. If that were a problem, we would see that as a change in the value of the inductor. We do not see that as we have a perfect tweeter curve.
  11. Dean, look at the blue line. Yes it is attenuated more than the AA as we expected. What we did not expect is that before we see that additional attenuation, it went 5 or so db high at first right at 400hz.
  12. Hopefully the plastic input terminal cup is not broken. If it is not broken, you are not into much of a problem yet. How about sending me an email with some pictures. Bob Crites
  13. I have seen a number of the older K-55V that were still working but had lost some of the output in the lower frequency range. I had thought the loss would be in the highs, but have never seen that, just lower output below 1000hz. In every case, replacing the diaphragm fixed that right up. Bob Crites
  14. Yeah, I like that better. If they make those caps using the same stuff they used to use, they should not effect the inductor. Bob
  15. How about swapping places with the air core inductor and the zener diodes?