Unfortunately the Crown doesn't have speaker level inputs.
I seems as though I've screwed myself with lack of planning and attention to detail.
The main problem is that its very hard to employ a passive pre in an active system without the optimum in amp synergy with the source. Now if my DAC output 4v instead of 1.8 then I might be able to get the present configuration to work. I still have to deal with the miniDSP learning curve.
Hmm....I am due to upgrade my DAC however I don't have the $$ to get a substantially better DAC.
Maybe I should give up on the active system and design a passive crossover and use just one amp. This is getting too complicated for me 'cause I'd have to tackle another learning curve. Audio is starting to eat up too much of my time.
If I had kept my very good active pre, which has a lot of gain, this probably would have worked out well. I wanted to use the Tortuga, which I DIY'ed, because I was impressed with the sound quality. It worked good enough with my tube monoblocks for the tweeters in conjunction with a small digital amp for the woofers. Unfortunately the monoblocks are now having issues. Also I felt that the AE TD15m's could use more power than 25w/channel especially with an active crossover. In addition I suspect that the little digital amp might have been operating a little out of its comfort zone with a low Zin.
So now I need a buffer which, in some ways, defeats the purpose of having a passive plus adds more IC's unless I build it into the Tortuga.
Alternatively, just quit DIY altogether and sell all my gear and just go with a simple system that doesn't require such a time investment which I could better use listening to music and finishing my endless home remodeling project.