One great speaker! Detail, Volume, Bass! But it does need some power to drive it. The manufacturer recommends 50-600 Watts; Lewis Lipnik, who reviewed it in Stereophile in 1987 recommended 1,000 Watts for orchestral pieces (he is a professional classical musician). Impedance is rated at 8 Ohms, and the manufacturer specifies that it doesn’t drop below 4 Ohms. Developed as a Studio Monitor, the Series 2 corrected the reportedly ‘muddy’ bass of the previous version which had gained acceptance in recording studios around the world. It was originally marketed with a ‘bass alignment filter (otherwise known as an atmospheric equalizer) to bring the crossover up to. 6th order Butterworth design, without it, it remained a 4th order Bessel design. Until I can get an analyzer on it, I’ve pressed an MQ-107 Environmental EQ from McIntosh into service (I can’t find the B&W unit online).
It is capable of Bi-amping, and right now I have one MC-252 connected to the bass driver, and another connected to the midrange and tweeter, but I’m thinking of bridging both MC-252s and using my Rogue Audio 100 Watt tube power amp to drive the midrange and tweeter.