Lou made a pair of Maple BOW's for me, but with two 12's per cabinet, instead of the one. My room is pretty large and mostly concrete, so bone ratting low frequencies were hard to come by.
Not so, any longer.
I use them with both a pair of Maple Ulysses Ver2, as well as my own homemade 15" coaxial speakers and the ability to pressurize the room is amazing with both pairs of speakers. Imaging is also definitely better with the BOW's than without.
For what it's worth, I bought a pair of Emotiva 500 watt per channel into 8 ohm monos to drive them, but have had much better sound using a Plinius SA 102 running in Class AB for this purpose. They sound much better being driven by the Plinius amp, so if you go with BOW's, don't scrimp on the amp to drive them.