Just ordered a sub (please don't hate me because of my less home theater oriented choice)
I went for a REL T/9x because of a mix of look, size, specs, hardware that allows to drive this sub in a lot of different way (you can plug this sub to left/right front speaker output to get then playing so part of the front channel bass, don't know if I will use that feature).
Edit : I wont, it's only applying if your amp is a class A or AB. Not compatible with the RX-A8A class D amp
Edit 2 : it's actually is, the wiring is just different...