To me "whole stage" has nothing to do with full frequency range, it has to do with creating a realistic holographic image with a palpable soloist (vocalist or instrumentalist) in the center, and the other performers/instruments in their proper location.
This does NOT require a full frequency range, but rather a signal free of any time smear due to crappy IC's and speaker cables, and a speaker with strong and accurate midrange rendering (efficient cones, small ribbons, or small stats.) Spicas (on stands?) would make great bedroom speakers ;--)
The brain cannot detect the location of frequencies under 100Hz, and most average sized bedrooms (10 x 13 to 12 x 16) cannot support frequencies below 35 -- 45 Hz anyway. So a very small, limited low-frequency-extension sub might be desirable; but not mandatory if your main speakers go down to at least 40Hz.
Most bedrooms are full of highly absorbent surfaces and furniture, so very little (if any) audible high frequencies will make it to the pillow ;--) However, a high quality dome or ribbon tweeter (or a stat of course,) will contribute to the production of audible lower frequency harmonics, and should be considered in your speaker selection.