Is your system still Analog if you use any form of DSP?

"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.

Sound is always analog no matter what hoops it jumps through along the way. 

If you want to stay analog. You can actively or passively high pass filter your mains. This really helps integration without dsp. I have nothing against dsp.

If the main speakers are fed by an all analogue path from LP12 to speakers and the DSP is only applied to the signal going to the subwoofers it would be fair to call it an analogue system with DSP subwoofers.

It is an (audio) illusion as is everything sensed and perceived.  That allows my mind to make things good or bad. 

LOL! I see – your mind is more powerful than mine. In mine, everything that is, is perceived (esse est percipi, for you Berkeleyans out there), but the powers of my mind are unable to control perceptions of bass waves, first reflections, and background noise.