Depending on your taste, You might be quite happy with just slight boost in low frequencies to add some warmth to the sound, so I suggest that before investing any money, just experiment a bit with Your loudspeaker placement. Moving the speakers closer to the walls usually boosts the bass frequencies few db. The downside is that now the bass might sound boomy if You play at louder volumes, so it is not the most convenient tone control, as You need to move the speakers when You change the volume. Then again, we all could use some physical exercise every now and then