Stupid Mistake

I have been doing a demo with Merrill Audio Element 116's. Excellent amps on several levels. After around a week I went back to my Classe' CA M600s. They were off for about 7 days, the longest they have been off for aprox. 4 years. I played 5 tracks with the 116's and then hooked up the Classe's and played the same 5 tracks. The Classe' sounded lifeless! Also take into consideration Class D and Class AB. I was stunned. I hooked the 116's back up.
Well it finally dawned on me last night! The amps were stone cold! No wonder they sounded lifeless! Been playing in the Audio world for a long time! And I make a bone headed blunder like that! Needless to say got up at 4:30am switched some things around and warmed up the Classe' Amps. Now my evaluation may be more accurate! Still shaking my head...