Comments on: Classe Sigma SSP, AMP2 & AMP5 everything electronic Thu, 21 Jan 2016 23:57:00 +0000 hourly 1 By: Ken3580 Mon, 03 Nov 2014 18:59:00 +0000 I haven’t heard these but I have recently listened to the brand new NAD Master’s Series M17 and M27, which ar ealso based on Class D technology. I compared them to an older Classe system – same speakers – with the Classe amps (Class A/B) and pre-amp worth about $25,000. The NAD based on the Class D technology could not match the realism and depth of the Classe based on the Class A/B technology.