I'm not sure what you mean by "big" sound, but I suspect you're targeting lower mid-range warmth and reasonably clear and "spacious sounding" upper end (usually upper-mids onward).
For the latter, a lot depends on speaker placement: as you're firing along the long side, reflections from side walls could easily smear the imaging (i.e. the precision) -- so not a speakers problem.
For the latter, a subwoofer could do the trick -- if you decide to stay with small speakers. Models like the JMLab mini Utopia or the small B&W Signature or the small Sonus Faber (Cremona line) are nice and project a sound that is far "bigger" than their size would suggest.
As to recommending specific larger speaker models, hints regarding your musical preferences would be useful: there are VERY many speakers that could (or not) fit your bill... Cheers
For the latter, a lot depends on speaker placement: as you're firing along the long side, reflections from side walls could easily smear the imaging (i.e. the precision) -- so not a speakers problem.
For the latter, a subwoofer could do the trick -- if you decide to stay with small speakers. Models like the JMLab mini Utopia or the small B&W Signature or the small Sonus Faber (Cremona line) are nice and project a sound that is far "bigger" than their size would suggest.
As to recommending specific larger speaker models, hints regarding your musical preferences would be useful: there are VERY many speakers that could (or not) fit your bill... Cheers