LTD02, it's 180d for an LR2 and 360 for LR4.
The phase alignment is the hardest part of an LR2. Because of the very wide bandwidth and need for phase alignment. 4th order and up are much easier because driver interaction is over a short bandwidth. Which is why I started by saying that the higher order cross overs don't need as much attention past the knee. BW crossovers seem to have more flexibility, because if 90d out of phase, there is still flat on axis summation. If its in phase, then there is a 3db hump, but power response will be flat (in theory, I've never done it personally).