"I have two subs integrated with my Source Point 8s. I only use the cutoff in the subs to set their level connected to the second pair of pre outs on my preamp."
I understand. However, if you're talking about integrating your subs in a music only system, speaker cable level connection is the best way to go if your sub has it. If you are getting good results with your current set up, that's all that matters.
That said, I just noticed that I never answered your question. Sorry about that. If you have DSP and you convert the signal from analog to digital, then back to analog, I would consider that not to be a fully analog system. It can't be. Also, since you bring up sub woofers, if the DSP is only in the subs themselves, then the digital applies only to them, and not the rest of the system.
My recommendation is always, if you have options, try them all and pick the one that sounds best. Its your system, set it up your way. That's all that matters.
