I think my system is the Classic and I have a subwoofer. The base is real heavy. Other than selling the whole thing and getting a new model, is there anything I could do? Such as, if I could sell the base, could I use a base from a new model? Might be hard to sell my base only, lol.
I took a look back, and you've been a member here for a long time. That means your L1 is the L1 Classic.
Unfortunately, the Cylindrical Radiator® and power stand (the tower and the big flat piece into which you place the tower) are not interchangeable with later models. The B1 Bass module (subwoofer) can be used with later models.
If you were to sell your system, you'd do well to sell the whole unit so the buyer gets a fully functioning system.