I combined the LO15 with B&C DE250 compression drivers in the CD SEOS-15 waveguide made by Autotech. These waveguides match directivity patern of the LO15 very good. The LO15 covers the 40 – 800hz range in an Open Baffle, an excellent driver for this job! I never have heared a more coherent and involving system (maybe some ESL / planars, but this setup is more involving). A real “live” like experience.
About driver / waveguide integration, this is interesting: http://www.pispeakers.com/Pi_Speakers_Info.pdf (especially page 13)
If you are planning to use waveguides these AE models are excellent.