I have M&k mps 1510s across the front and M&k K-4s performing rear duties. I have a Velodyne VX-10 sub but fancy an upgrade. My room is 3.6m long 2.9m wide and 2.4m high Amplifier is a Yamaha DSP-AX750SE. Available on the classifieds here are the SVS 25-31PC+ and the Servo 15. Which one would be best suited for my requirements? Adrenochrome.