I got a Sigma HC 20A this week and it's connected to the Krell 403E amp. All I can say is wow! There is a big difference between the Alpha HC and Sigma HC. Everything sounds bigger and fuller. Bass goes deeper and just sounds more powerful.
After hearing the Sigma HC, it's hard to go back the Alpha HC. My Audio Research Ref 250s are connected with Alpha HC. I will need to upgrade them to either Sigma Analog or HC ��.
Probably the Ref6 too. I shouldn't have tried the Sigma HC. Ignorance is bliss is very true in this case. Now it's too late now.
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