Hi,
After a long and harduous journey I have ended up with a system that I am very happy with and consists of:  Apple Mac Mini > Lavry DA10 > PMC AML1 speakers.  I now have to move my system into a larger room and I'm missing a touch of bottom end bass 'grunt'.  
I've been considering adding a sub to the AML1's and PMC recommend the SB100 passive to partner the AML1's.
My question is:  Other that a PowerPack amp for the SB100 do I need a crossover such as the Bryston 10B to make this work?
Cheers,
Monty