My Sensation M451 arrived about 3 weeks ago still not fully burned in yet and I have changed the tube to a new Full Music 12ax7 tube which I feel does improve the sound.
Due to the back order of the battery power supplies I am having to use the cheapest power supply while I wait for mine to be sent. This means that although it easily drives the HE-6's and LCD's the power output into 50ohms is about the same as my other amps which although not bad by any means is not what I bought the amp for. When the battery supply arrives it will be outputting nearly 4 watts per channel
At the moment it has good and bad points.
GOOD
Superb detail,clarity,transients and speed.
Excellent soundstage depth.
Excellent PRaT
BAD
Far to much hiss,especially with the LCD's so basically makes them unlistenable (although disregarding the hiss they do sound spectacular!). HE-6's not so bad especially with rock and metal. (still maintains excellent detail and clarity though)
Bass could be deeper
Highs could be smoother and better defined.
Even with the tube buffer it sound very SS like to me.
I expect the cheapo power supply is the cause of most of these problems as well as the need for further burn in. I will submit a formal review once burn in is complete and the batteries arrive.
A number of people have other Virtue amps and have no hiss even with sensitive phones so I am hoping for massive improvements.
So far I am liking it but feel its not got anywhere near its potential yet.