XB Mk II

The cheapest way into Estelon's marble-composite sculpture, and the one most often reviewed: a three-way with Accuton ceramic throughout, crossed at 85 Hz and 2.1 kHz, rear-ported, 69 kg, 1.26 m tall. Against the XB Diamond above it the only change is the tweeter — a ceramic inverted dome instead of diamond, which costs a little air at the very top and about $17,000. It reaches 23 Hz from a 220 mm woofer, which is the point of the shape: the cabinet has no parallel walls and no flat panel anywhere, so a box this small stays quiet at volumes that would have a rectangular one singing along. 6 ohms nominal, 2.9 minimum, 87 dB. $62,100 a pair.