I understand I can't set them separately using my processor's controls, but level and phase can be adjusted separately at each sub (the subs I'm considering are powered with level and phase controls). What I don't know is if this is enough or do I also need to be able to set distance separately as well.
I'm considering adding another sub (or outright replacing my sub) for extra headroom and a smoother response. Would something like the miniDSP give me the individual control I need? I've been to the miniDSP site, but found it confusing, and the response to my email was even more confusing (felt like I was in another country and didn't understand the language.. ).