Finally got some time to do some more tuning. I had to buy a new Windows laptop to get the DA1 programmed to "BMW". So now I am running digital from the headunit to the amp.
Here's a pic of the latest tuning session:
This is the closest I could get the eq curve to match the "house curve" in the Audiotec Fischer DSP program.
I've got all crossovers set to 24db Linkwitz-Riley.
Crossover points are:
200hz high-pass for front/center/rear
70hz high-pass/200hz low-pass for underseat woofers
70hz low-pass for trunk subwoofer
To try to combat the mid-bass hole the SWS 8Xi's have, I actually boosted their gain higher than the rest of the channels. That way, the eq could cut the frequencies that were too high while leaving most of the mid-bass at the appropriate level. While this improved the sound a lot, you can see that there is still a dip around 160hz. Honestly, I don't notice it while playing music.
I also took the opportunity to setup some more sound profiles in the Helix Director:
1. All speakers playing, including center and trunk sub.
2. All speakers and sub playing; center off.
3. All speakers and sub playing; center and rears off.
4. All speakers playing, including center; trunk sub off (this involved deleting the high-pass crossover point of the underseat woofers so that they play down to 20hz.
I may add more sound profiles in the future, but for now this will do.