I looked at Plasers room for the first time (boy am I slow or what). Setting up and integrating a sub woofer in a small room isn't a walk in the park, and IMHO, with all due respect to all, in a room this size may still not produce the sound that will make a piano sound more 'real', just with more bass, probably uneven bass. I really don't know........
But consider, that a lot of the warmth of tone, that will make a recording of a piano sound more authentic, may not be just in the deep bass, but may result from some elevation in frequency response say between 75 and 200hz. The use of a small sub, with a 2nd order crossover, set at 80 hz and the main speakers run full range could produce a bit of an increase in the frequency response between 100 and 200 hz - just enuf warmth to make a piano sound more real, without doing serious damage to imaging. (All of this of course ignores room and placement FR response issues).
Or not, just an idle thought I had in the john........
But consider, that a lot of the warmth of tone, that will make a recording of a piano sound more authentic, may not be just in the deep bass, but may result from some elevation in frequency response say between 75 and 200hz. The use of a small sub, with a 2nd order crossover, set at 80 hz and the main speakers run full range could produce a bit of an increase in the frequency response between 100 and 200 hz - just enuf warmth to make a piano sound more real, without doing serious damage to imaging. (All of this of course ignores room and placement FR response issues).
Or not, just an idle thought I had in the john........