About the wire colors, I've seen some connect one way and others connect the other. Doesn't matter to me; It's just a way to keep it straight. About the 1.0mH coil, that's a good choice too. I use a 1.0mH coil when horn-loading the driver. Values between 0.5mH and 1.0mH work just fine to remove a little bit of energy above 2kHz. Naturally, larger values make it a little bit smoother, although the difference is pretty subtle. Just enough is just about right. We're looking to carve out about 3-5dB in the octave above 2kHz.