I would check out Hypex for a solution. Also Accuton, maybe one c. They make both biamp modules and DSP units. Super high quality and accuracy. Your way is the best for damping and transient response with the amp being direct coupled right to the driver. I am rocking 5 ADS L1290/2s biampable but haven't set up the biamp yet. Built the center channel copying the Rich So model on his website. Saved a bunch of money buying on Ebay and then rebuilding. Very accurate for the price. Speakers were designed by Godehard Gunther, 3 phds Physics, chemical engineering, and Astrology. Came over from Germany after being the head of there Acoustical Society, to work for NASA.