Kevziek is right though, the meter on the XA series is just a "nice-to-have" feature and does not perform any function.
On the X.5 series, the meter, when it starts moving, indicates that bias on the amp is going from Class A to A/B operation.
My B&W N803s make the meter move on my X250.5.
Playing a recording with some decent bass/mid-bass, I have to get the preamp volume above the 10 o'clock position and the meter on the amp starts moving.
But I love the Class A operation of the X250.5 amplifier when listening on low levels. Plenty of drive, slam and detail.
On the X.5 series, the meter, when it starts moving, indicates that bias on the amp is going from Class A to A/B operation.
My B&W N803s make the meter move on my X250.5.
Playing a recording with some decent bass/mid-bass, I have to get the preamp volume above the 10 o'clock position and the meter on the amp starts moving.
But I love the Class A operation of the X250.5 amplifier when listening on low levels. Plenty of drive, slam and detail.