Totally agree w/ Rrog & Marakenetz. The 801 S3 is one of the finest speaker systems ever made. However, they are inefficient and were designed for professional-level amplification. Auditioned them back in the day with Threshold Stasis electronics, Sota Sapphire with a Magnepan Unitrac arm and Dynavector 23RS Ruby. Wow! Bought the table rig but couldn't swing the speakers at the time. Don't fool around; go for as much current and power as you can get. You won't be disappointed.
B & W Matrix 801 S3 and tube amplifier
I cannot find an impedance graph for B & W 801 S3.. The manufacturer states min impedance of 4 ohm and recommends amp of at least 50W. I am wondering if a 60W tube amp such as Conrad Johnson MV 60 or Premier 11A would do the job for mostly low level listening in a small-mid size room. Does anybody have experience with similar combination ? Would ss Conrad Johnson amp be a much better match ?