After reading that crown has released M2 DSP parameters for the DCI N series of amps (thanks Valentin), I've been really thinking on what I could sell to obtain either the 4|600 or 4|300. My original plan for my DIY M2's was to either use a crown K2 or Mcintosh MC2155 on the lower end and either a MC2100(rebuilt) or the MC2155 on the upper. The DSP would be a BSS Blu-100. Given the age of these amps I'd like to replace them at some point, but I'm unsure if the crown sound as good. Any thoughts or experience on these series of amps? Thanks, Scott.