You know the speakers perform differently with a different receiver/amp? You have active subs? Wattage rating doesn't mean much on its own and CV doesn't define it either (is it peak capacity or continuous?). When a speaker manufacturer merely states a frequency range of 26Hz -20kHz like CV did with your speakers, and not specifying +/- 3dB then it doesn't mean a lot as the 26Hz point could easily be 10dB down, and the normal measurement spec of +/- 3dB could be quite a bit different.
CV indicates a sensitivity of 95db at 1 watt at 1 meter distance, so at the same distance you'd get 98 dB with 2 watts, 101 dB with 4 watts, 104 dB with 8 watts, 107 dB with 16 watts. The spec for reference volume peaks in a movie is 105 dB for comparison. At what spl levels are you listening ?