Then sound is space that you can hear. Both are interesting ways of framing space and the senses, but I'm not sure what you mean by "only". To reduce space to

Then sound is space that you can hear. Both are interesting ways of framing space and the senses, but I'm not sure what you mean by "only". To reduce space to "only noise", in my understanding of your statement, is to imply that it is something extraneous, something to be ignored, or at least given less significance, instead of it being actual, existent, a fundamental aspect of reality that we can describe in useful ways. Either way is interesting imo.