I have to say that this one so far sounds the best to me. That is probably because it has bass in the given configuration (sealed box, no sub playing). But it does have a nice richness to it even with stuff that doesn't have bass. It took a long time between changes, so it might be mind tricks. Or it might be the steeper slope on the crossover. Or it might be that it's not as sensitive and the amp gets worked harder. Who knows. Anyway, I like it a lot. For reasons I don't really follow, this one needed more delay on the woofer to match up. I didn't want to invert the tweeter to get there, since I want it to be able to play with the middle channel speaker Malcolm which has non-inverted tweeter (not sure it matters, but why not keep it the same?). So I added another two filter sections, which has the added benefit of rolling off the break-up region of the woofer even further. There are some slight changes to the tweeter section, too, to help with the match at crossover. edit 7/14/2012: The treble sounds a bit hot, depending on the environment, adding a 10 ohm resistor across the tweeter brings it down about 1.5dB if you need. edit 8/4/2012: I made some changes to the crossover to roll down the tweeter response some, and improve the load impedance. The v2 design files can be gotten at http://libinst.com/SEOS/SEOSDES12Aug2012.zip and the v2 schematic,with Parts Express part numbers is at https://www.circuitlab.com/circuit/w3863p/seos12-delta12lfa/ Schematic (v1): I won't measure the horizontal pattern, since that's mostly just the waveguide and woofer diameter and it's the same. Vertical pattern is less touchy on this (the crossover is steeper). Here's the on-axis response just.... because: It is also the prettiest, I think. Cosmetically matches the SEOS12 nicely: Maybe that affects perceived sound, too.