Culpeper
Active Member
figured out why the midrange and tweeter driver sections are reversed polairty from the factory. When set to Clear it is coming out normal polarity from the crossover and reversed on the drivers. When on Natural or Soft the polarity is reversed from the crossover. Something to remember when modeling in Xsim. Also, explains the advertised 750Hz crossover frequency. It is based on the system response crossover with the woofer and not the actual crossover between the midrange and woofer. Here is another example of a 1st order modification with the same MCM woofer. One with the -180/+180 vertical line is reverse polarity on the midrange with a very acceptable flat system frequency response. Regular polarity has the near linear system phase. Very nice. Hard to decide but easy to determine by listening in the room. No noticeable HF bleeding into the LF or LF breakup. Converting to 1st order on the tweeter and midrange is really simple. Remove the 16R resistor. Disconnect the transformers and keep the switches on Clear or solder the switch just to keep it there.
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