Even if you're meditating as you say, which I have practiced letting go of my senses, you're still perceiving everything rather than nothing. You still hear your heart beat, your breath, see the colors in your eyes. You are just becoming one with it all, transcending beyond the physical realm of what we perceive something to be and into a state of unity with the surrounding energies. Absorbing and merging with the very noise of the universe, if you will.
Yes, I am "perceiving" nothingness, which means the universe is nothing. When I do that, I don't hear anything, see anything, or feel anything. No colors, no sounds, not even pitch black emptiness. I just turn off my mind, and get nothing from my outer senses, and no thoughts in my mind. I just can't do it for very long.