Assuming your speakers and chairs are up against walls Millercarbon's suggestions will work. Stuffing the ports will change the bass depending on the tuning. It will cut the lowest frequencies off almost entirely. But, stuffing the ports with towels is a harmless easily reversible thing to do so why not try it! That's the way you learn.
If you do not like the bass than these are probably the wrong speakers for you. Unless you can afford digital equalization you are better off buying new speakers than spending money on an analog equalizer that will mess up everything else.
If you do not like the bass than these are probably the wrong speakers for you. Unless you can afford digital equalization you are better off buying new speakers than spending money on an analog equalizer that will mess up everything else.