While the difference between the M80 and M80HP is subtle it's the subtlty that you're missing/craving/wanted all along.
If you're looking for thundering bass get a sub. If you want M80 performance with a bit more reality, try the HP's.

edit: I asked Ian the same question (DSP or upgrade) and he confirmed the newer speaker will perform better/would be the better choice. Glad I listened....no pun intended but I am very happy with mine.

FWIW, Sometimes it's just a matter of trying a new positions with the current speakers...

Last edited by brwsaw; 05/01/15 05:32 AM.