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RE: Tweeter difference problem with 3.3Rs and more

Part of your problem matching up with the Behringer sounds like a phase problem. Remember that unless you adjust phase the Behringer will be at 0 while the phase ON THE PLLXO changes from -180 below the crossover frequency to about 0 an octave or two above it. That means you will get cancellation at some point around the crossover frequency. So try the 3rd order again and adjust phase to match the PLLXO as well as you can along with the crossover frequency. So yes, we are talking phase, polarity and orthogonality.

The LR is steeper than the Butterworth, so you will probably have a similar problem - but perhaps more of it.

Magnepan often suggests using second order crossovers as an alternative to the third order low passes when using an active crossover. I think this is in part because the bass is always set up as third order LP because of the great demands it puts on power amps and that it is easier to drive a third order than a second order since the odd order crossovers (at speaker level) position the current phase at 90 degrees to the voltage phase, so that the power envelope is less likely to be breached - and you have less of a chance of clipping.

For cermets and wire wound pots, in linear taper, you need to look to places like digikey, molex or Arrow electronics distributors since these are not used in audio but in instrumentation.

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