I took advantage of the thanksgiving sale and purchased the Ultra-X13. Fits nice in my room. Love the subwoofer. Left plugs out, equalization 2 (thx recommended). I set crossovers through oppo bdp 105 and emotiva umc-200. I also manualy set distances. I use 7.1 direct analog outs from Oppo, stereo setting from umc-200 analog input (to engage subwoofer for 2.1) from oppo two channel out (direct), and HDMI for cable tv box (umc-200). I have a fairly large room, subwoofer integrates easily, and bass is effortless. Whole system has benefitted. One happy camper here. Maybe soon I'll try different port tuning, use my db phone meter more accurately, maybe even try emoQ. Haha, for now I'm just listening. Recommended.