Guido - I don't know the Whisper impedance curve, but they are rated at 4 ohm nominal and about 95 or 96 dB efficient, I don't remember off the top of my head.
The Stereophile review seemed to start well, but then MF began some deep criticisms mostly in comparison to his tube amps as I remember (but my memory doesnt always serve me well). I was informed that the amps he had were brand new and unbroken-in, but you never really know. Even my amps sounded sterile and flat when they were new which matched his observations. I left them playing when I went on a trip to get the hours up. Now they are really nice. I wouldn't have believed this burn in thing if I hadn't noticed it myself.
In the end it always seems to be a question of synergy anyway, as much as that complicates matters and frustrates us.
The Stereophile review seemed to start well, but then MF began some deep criticisms mostly in comparison to his tube amps as I remember (but my memory doesnt always serve me well). I was informed that the amps he had were brand new and unbroken-in, but you never really know. Even my amps sounded sterile and flat when they were new which matched his observations. I left them playing when I went on a trip to get the hours up. Now they are really nice. I wouldn't have believed this burn in thing if I hadn't noticed it myself.
In the end it always seems to be a question of synergy anyway, as much as that complicates matters and frustrates us.