[MatrixDweller]

There are a few differences other than the obvious styling.

- The Synergy series uses aluminum dome tweeters where as the Reference series uses titanium diaphragm compression drivers. Titanium being considered better by some.
- Synergy uses injection modeled graphite (IMG) polymer woofers where as the RF line uses Klipsch's patented Cerametallic technology. I think the Cerametallic is stiffer yet still fairly light weight.
- Synergy is slightly less efficient, but not by much.
- If you like the look of wood grain you won't find it in the synergy line.
- The synergy line's floor standers are all front ported where as the RF line is rear ported.
- The synergy bookshelves are rear ported and the RF bookshelves are front ported on the 61 and 81.
- The RF line digs a little deeper in the bass department but not by much.
- Personal listening experience, the RF line sounds a little crisper and more refined, although both do sound very good.