If your monitor speakers are standing directly on the table, it’s time to sort this out. Monitors standing on the table can cause the table to begin to resonate with the bass coming from your speakers. This will degrade the sound coming from your monitors as the table sucks some of the bass energy – you easily start to lose definition in the low end.
Fortunately this is a very simple thing to fix. There are specially made isolation pads available – or you could come up with your own from any sturdy foam or rubber (even a mouse pad will help a great deal).
Place the isolation pad under your speakers and you will probably notice how the low end of your speakers starts to sound tighter.