Sherwood's web site still lists "Crystal" DSP's for the 772 and the 872, plus the 872 is listed as using their "SNAP" EQ software (which I was under the impression was a Cirrus-based EQ, first offered on the Sherwood 965). That suggests they stuck with Cirrus for the 872. The 972 is a pretty different beast, though (based on a few visits to the AVS thread). The Trinnov stuff sounds like it would need a lot of CPU power.