Update.....
OK, front sound issue resolved (firmware update to DSP) AND ALL I CAN SAY IS... WOW!!
First off, the guys at Hansshow were tireless in their assistance, day and night. I woke them up, they woke me up and never stopped until I was happy. The final sound product is nothing short of amazing. I play my music rather loud and the highs are crisp and the new sub thumps my back through the seats. A song like Bohemian Rhapsody really shows it off. Even my wife was impressed which is not an easy task. All I can say is that is worth every penny. My son has an M3 AWD with the full premium sound system and mine blows it away. Here a a few items I saw:
The DSP is very high quality, well built, passive and active cooling . Instant start-up with no pops. I have not heard of the specific brand, but it does not appear to be a cheap off the shelf item.
The DSP enhances all the speakers, not just the ones the harness turns on. The "immersion" option now clearly changes the sound, making it far more surround. There is strong separation for the front and rear speakers. The sub is very well built, in custom wood enclosure, covered in the usual sub "fuzz". It looks like either a carbon fiber or Kevlar cone and it really pumps the bass. The overall look of the entire kit is high quality.
I was able to literally crank it to "11" and the sound was still clear. All in all, if you want kicking sound, this is a great value for the money.