I spent about 8 hrs yesterday listening. I used mostly female vocals yesterday such as Susan Boyle,Joni Mitchell, Holly Cole and Patricia Barber all on the 701. The amp benefits from warm up as it sounded best late yesterday. Ver fast nice detail and good bass. It is driving the 701 as it appears it was matched well for the K701. It has nice power and is very transparent. Today I want to open it up and see the parts are as advertised. I will post my review and compare it to the Little Dot MK11 with upgraded tubes which cost the same with the 80.00 tubes I am using. Early impressions on the two amps is that the Matrix does not stop the Little Dot. Different presentations but the little Dot is holding up very well.