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mrdb

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  1. There should be no change in the midrange drivers' amplitude: the two switches affect only the tweeter output. See my schematic in the KLH Library: "MRDB's KLH Five Crossover Schematic". It was not clear to me from the description of your setup if you used an amplifier between the function generator and the crossover/drivers. If not, then the source impedance of the generator (probably 50 ohms) would have been loaded by the crossover and that load would vary depending on switch position, causing generator output level to vary and this could explain the midrange level variation. You mention something about keeping levels constant so I am not sure if this is your problem, but it is worth a look. Bob
  2. I thought that the green tweeter was used in the Smaller Advent speaker, with a 4 ohm impedance. The literature that I have talks about being able to use a smaller magnet on that tweeter (lower sensitivity and lower cost) because of the sensitivity difference between large and small woofer. Making the Smaller a 4 ohm impedance allowed solid state amps and receivers, which were plentiful by this time and likely to be used with a speaker in this price range, to deliver more power to the speaker. Bob
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