Our standard physical senses are limited in the well understood manner to perceiving a certain limited range of vibratory energy in the universal spectrum.
So? How can you know that there is anything outside of what we are able to perceive? How can you know that the reason we can only perceive what you describe as a limited range isn't because there is nothing outside of that range.
By simple inference, the same way we know there must be something out there we can label "dark matter/energy" even if we have no clue yet what it is, or the way we know there must be certain massive objects in some parts of space even though we can't yet detect them.
Different kettle of fish. While my eyes are capable of only seeing in the visible EM spectrum, that does not mean I cannot perceive outside of that. I can perceive UV radiation because of the effect it has on my (very fair) skin. Using special detectors it is possible for me to perceive radio waves and gamma rays, electrons and positrons. And by observing the universe we are able to perceive the existence of dark matter and dark energy (for otherwise how would we know it exists?)
That we don't know exactly what dark matter or dark energy is yet is a completely different kettle of fish. We are able to perceive its existence, and thus it is not outside of our range of perception.