The enclosure contains a 12” (305mm) neodymium LF drive unit, linked via the internal passive crossover network to a 1.7” (44mm) diaphragm, 1” (25mm) exit HF compression drive unit. The HF drive unit is coupled to a constant-directivity waveguide, which produces an 80°H x 60°V dispersion pattern, which yields not only consistent response throughout its operating band across the whole coverage pattern but also strong attenuation outside of this pattern.

The robust enclosure is constructed from premium multi-laminate Birch plywood and is finished in impact resistant textured paint. Two NL4 connections are provided on the rear for input and enclosure link. The front of the loudspeaker is protected by a rigid steel grille backed with acoustically transparent foam. A flush bar handle, 35mm polemount socket and various threaded fixings are provided in the enclosure for optional rigging hardware. RAL colour matching and weather protection options are also available if required.

The EMS-121X requires a single amplifier channel, and should be used with professional power amplifiers capable of delivering 600-800W RMS into an 8-ohm load. For optimum results, the EM Acoustics DQ10 or DQ20 Advanced System Amplifiers, or the AQ Series power amplifiers in conjunction with the DSC48 system controller (for loudspeaker protection) should be used.