Got the homework to a manageable point due to time off around the holiday and decided to play with the dsp408 for a while before heading to the lake for some fishing.
For the most part, physically copied the filter slopes, timing, peq settings from the minidsp to the dsp408. It sounds different but the results are pretty darn close, at least for one on axis measurement. I'm thinking off axis should remain the same since the filter slopes are the same.
The hum is bothersome. Probably a ground loop somewhere but have yet to figure it out. There was a little bit of hiss/tweety bird with my ear near the tweeter with the minidsp in the system, but the hum with the dspp408 in the system just too much.
Notice how the treble is down about 4db in the first trace (light blue). To my ears it doesn't sound that dark but the room they reside in is about 24'x26' with a low and multi-angled ceiling, all sheetrock plus hardwood floor. A clap of the hands tells just how live and bright the room is.
Light blue trace is the baseline minidsp that I've been listening to for time. The brunt orange and lime green are the newly constructed dsp408 filters. Huge room nodes around 140 and 40/50hz.