So I right now have a 7.1 multi channel set up. I use a Marantz SR5003 as my AV receiver. My center speaker is a Polk Audio CS10, my front left and right speakers are Polk Audio RTi4, and the SL, SR, SBR, and SBL are Polk Audio RM2350. My subwoofer is the Infinity R12 reference subwoofer. Now, with my receiver, there are many surround modes, and I am curious as to which ones would be best for gaming, music, and movies. The room for my setup is 13.5 feet by 20 feet, with one of the 20 foot sides opened up into a much larger room. I have the speakers all calibrated to the correct distance to the central sitting point, and set them all to the same volume from that point. I want to know what kind of surround modes I should use. I currently am liking M-CH Movie for music, and PlIIx Cinema x NEO:6 Cinema for movies. In case the picture is hard to read, the surround modes it has are Dolby TrueHD, DTS HD, SRS circle surround, Neural Surround THX technologies, and other things that I don't think are sound modes. Any suggestions? Also, random question, but my subwoofer says its frequency range is 29-150 hertz. According to a hertz reader I was using, one of my songs hit 24 hertz and was played by the sub. Can it go lower than it says?