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BEC last won the day on January 27 2014

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  1. Normally autotransformers are used to attenuate or reduce the output of a driver. In the case of the CF-4 the autotransformer is installed backward and it effectively boosts the output by 4db. Bob Crites
  2. I have had better luck with just single runs of coat hangers. Twist too many together and you get something similar to a toroidal flux inductor and those are dangerous.
  3. This thread almost makes me want to go dig out those coat hangers again. Bob Crites
  4. I guess you mean the z-bracket holes compared to the K77D mounting holes? I am not certain about that. Would have to get some out to compare them. Bob Crites
  5. Actually, I do not think you could. Your corners of the cutout are rounded. I think they would have to be squared off to have that horn fit. They stopped squaring off the corners at some point before yours were produced. Some people have used them by doing some file work on the corners.
  6. This picture shows the newer K-77D and the K-77F with z-brackets installed behind it. Bob Crites
  7. Hole size is decreased in 2018 Lascala II. Not sure exactly what year they reduced the size. First of the Lascala IIs used the K-77F with standard size horn used by all earlier K-77M tweeters allowing the entire horn to extend through the motor board with z-brackets. Even after the change to the K-77D for some number of years the larger hole was maintained and earlier tweeters could be fitted to those holes using z-brackets. As of 2018 (and perhaps some years earlier), only the K-77D could fit in the holes and no way to use the earlier K-77F or K-77M tweeters. Attached is a picture of the K-77D installed in a 2018 Lascala II. Bob Crites K77D_in_2018_Lascala.pdf
  8. @simon Send me an email at bobcrites@mac.com Thanks, Bob Crites
  9. The version you have was made after 2010. All made earlier than that were made by Tonsil in Poland and have the internal threads.
  10. I have a B&C price list. There are 4 versions of the DE75 listed. One of those is the DE75PK. I can find data sheets for all of them except the DE75PK. I suspect that is the one Klipsch uses. Bob Crites
  11. Our buddy Terry Cruse sent me a K-33 out of a Cornwall to see why it did not work many years ago. He had just reached (I believe) 124 db and suddenly the woofer was just silent. When I cut into it found the voice coil had come out of the magnet gap and then just impacted back into the top of the magnet assembly crushing it in the process. Might be what happened to yours. Bob Crites
  12. BEC

    Chorus II

    The CW1526CF can be used in a Chorus II but is not rated at the amount of power the original woofer is. Another consideration is whether or not it will even fit. The cast aluminum frame is 1/8 larger in diameter than the steel frame original woofer. In some cases the cast frame will fit in the recess and in some cases will not fit. Bob Crites
  13. There are no diaphragms for the K-55M. I have managed to modify K-55V diaphragms to work in a K-55M, but the procedure is not easy and I would not recommend doing that except in the case where you have a dead one and are trying to bring it back to life. Bob Crites
  14. They have discontinued the Selenium 25-25 that has been around. I have some that might work. But I doubt there is room to install an adapter and the screw on driver before running into the back of the cabinet. You can send me an email. Bob Crites
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