No bass for HT with Vandersteen 2wq...

I have a Vandy 2wq subwoofer that I use on my home theatre system. I bought this model rather than the 2w because, while not my primary music system, I listen to quite a bit of 2 channel music on it. But because this model uses a high level input, I have to set my Adcom processor to "no subwoofer" and the front speakers to "large". But the problem is that the bass level is not sufficient for HT. I don't use a crossover because the sound deteriorated substantially, even with the filters from Vandy. Also, I use a VTL preamp on this system for 2 channel music, and there is more than enough bass (no problem with the sub).

Here are my options:

1. $$$$- Buy a better processor with better bass management- I don't want to do this because I don't want to spend $4K or more on a decent one. Also, I'm not sure if even a better one can properly re-route the sub signal to the mains.

2. $$-Buy a low cost amp and run it from the sub out of the processor, and then hook to the vandy. The problem here is when I use for music (with the VTL preamp vs. the processor), I won't have the sub.

3. $$$-Buy a second sub for HT.

Anyone have any other ideas or opinions on which would be best sonically? Of course, the cheaper the better! I'm curious if others with this sub have had the same problem, or success with a different processor.

Any advice would be greatly appreciated. Thanks!