I've fixed a many situation like yours using defferent methods like the forementioned tactile pad. In your situaltion to save you some money you might try placing your combo on the ground facing up and put one of your feet on the amp. This will cause structural resonance in your body and help you to hear the low notes. If this is still not enough i would sugest get a Rolls PM351 and use it as a preamp/headphone monitor system. Later on if you like you can build one of my tactile pads to go along with the Rolls PM351 and have one heck of a quite bass rig.
Oh and welcome neighbor, i'm sure you will enjoy CMN and it's wonderful members.