Sure, it is not a big deal to listen a single-driver speaker. However, if we presume that by means of audio means we are able to make any difference in auditable experiences, and if to capitalize on this difference is you objective (of the objective of high-end audio) then a single-driver speaker is the last topology that might be used.
If you are the person who do not know or do not understand the magic of voices combining or the delight when multiple timbres merge acoustically then you are who you are and die with your little pathetic secret of big ignorance. A single-driver speaker, from the standpoint of advance audio results, is as bogus and is as capable topological idea as designing a bird with plumbum winds.
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche