As far as I know the biggest difference between the 8TiHC and the Model 12, Model 10 is the power supply. The Model 10 and 12 both use ultra-fast switched mode power supplies while the Model 8TiHC uses conventional toroidal power supplies. I am not sure what if anything has changed on the amp board. JRDG over the phone told me that the Model 12 would sound similar (relative term) but better than the 8TiHC in that the Model 12 would be more dynamic and faster. I have not confirmed this by listening so this is purely JRDG marketing speak. – Cheers, Dan
