Grizzly has a mini track saw on their deal of the day sale today for $60. The 'normal' everyday price for this saw it $90. The optional track (that you will need) is an additional $23.
This looks like it could be a pretty handy tool for speaker building. Not a perfect solution since it doesn't have a bevel adjustment. But still would be nice for cutting smaller pieces like braces etc.
http://www.grizzly.com/products/Mini-Tr ... -2-/T10824
Mini Track Saw - Grizzly deal of the day
Mini Track Saw - Grizzly deal of the day
4 x T39 - 20" - 3012LF (Built 2)
4 x OT12 - 2512 - Melded/D220Ti
1 x TAT - GTO804
4 x OT12 - 2512 - Melded/D220Ti
1 x TAT - GTO804