The very fact that subjective experiences exist, means that consciousness exists. Those who wish to claim that consciousness do not exist are simply trying to push the problem away, and are unwilling to accept its existence as it threatens their own philosophical views.
By that token, you would have to face the fact that subjective perception is so completely conditioned by physical and physiological circunstances. What does that say about consciousness?
Sound is a perception, like color and taste. Sound has no meaning in objective reality. The speed of sound requires a human observer to hear it.
That is just not accurate, and demonstrably so. The speed of sound is measurable (and in fact determined in various media), it is actually quantifiable without even taking a lot of ingenuity.
I realize you mean the experience as opposed to the physical trigger, but unless you can address the experience by some other name or perhaps propose an alternate word for the physical trigger this will cause a lot of confusion.