You cannot make the room sound bigger. If you do a comprehensive acoustic treatment along the likes of what erik-squires suggests, you will get smoother frequency response, better dynamics and better soundstage/imaging. A larger sound image in the same size room is the best you can achieve. It will involve both absorption and diffusion along with a good deal of trail and error experimentation.
How to make small room sound bigger
Is It possible to make a relatively small room sound larger ? I have a 14 x 11ft with 8 ft ceiling. The room is completely empty, with vinyl floors with cement floor under. Looking into vicoustic sound treatments.
What would be the best approach with absorption vs diffusion and placement to attain a bigger sound space if at all possible ?
I wrote to vicoustics, but did not hear back.
speakers : SF Elipsa, Diapason adamantes, Focal utopia micro
amps: mastersound 845, mcintosh mc452, NAD M10