XE500 15" 2-Way Bi-Amp Coaxial Stage Monitor BlackUtilising Coaxial Differential Dispersion technology, the XE500s horizontal coverage varies from 60 directly over the monitor, narrowing to 30 further back. This not only maintains the sound level and balance independent of distance from the monitor, it produces a well contained coverage corridor at head height. A patent pending, contour moulded static third waveguide greatly increases the effective size of the horn mouth to extend pattern control