IMO, your weak link is your digital source. This is just as important as the speakers and their placement.
I would not expect miracles from a $169 DAC and a cheap transport by itself. Time to upgrade if you want to get better SQ. Expect to spend $1K for a decent DAC and keep the transport, but change to a good BNC S/PDIF coax cable with RCA adapters and add a reclocker between the transport and DAC.
I would not mess with acoustics until you do these things. Only then will you achieve a focused stereo image with vocalists not being 2 feet wide.
Steve N.
Empirical Audio