I considered doing it that way when I first started, but I realised it wasn't going to work. The LFE really needs its own separate channel, because it has to be played a lot louder than the rest of the mix to get the full effect. The bass information is encoded 10 decibels lower than it is intended to be played back so that it can have more headroom--the receiver/processor increases the gain to where it should be when the signal is decoded. Mixing the bass into the mains at +10db would cause severe clipping in many instances, and if you didn't give it the boost it would hardly sound any 'bassier' than just playing the mains by themselves. If not using multichannel analog or a digital connection, the LFE is probably going to be dropped, also.

It looks like playing my files in straight 2.1 mode or else obtaining the 5.1 versions are the only ways it's going to work, here.