The room is indeed rather small, but there are some tricks that can help. Firstly, acoustic treatments will probably not help the bass, unless they are very large "bass traps". What will help, as Tacs has suggested, is speaker placement and listener placement. The best rule I have found to bass response is PRIME NUMBERS, kind of. Every pertinent dimension should be as unrelated to another as possible. I see for example, that your speakers are almost exactly twice as far from the back was as they are from the side wall. This even multiple means that specific frequencies will be doubly mangled by the two dimensions. But if the two distances were less related, each dimension would mangle a slightly different frequency, hopefully evening out to some extent.
Lastly, boomy bass in a cd player can sometimes be reduced by using Cones under the player, or some other form of vibration tweaking that couples the player more tightly to the rack.
Lastly, boomy bass in a cd player can sometimes be reduced by using Cones under the player, or some other form of vibration tweaking that couples the player more tightly to the rack.