Just got my Sierra-1's in and they are simply beautiful and perform as so.
I'm currently running the speaker's through my computer, with a DAC and a NAD C 326BEE. So a simple yet effective 2.0 setup.

My question is, if i was to get a Rythmik f12 can I adjust crossover's with my amp and the crossover on the rythmik or is the only way to do that to have a specific crossover adjuster on my amp (which is does not have), like a receiver? I'm not really willing to buy a receiver as I don't need all the extra's it comes with. Would the rythmik be worth it since I can't adjust the crossover?

Also while I'm at it, is their any real tweaks I can make to my setup that would be beneficial? I already have the Q-plugs A in my speakers.