Ultra-compact two-way passive, infinite baffle loudspeaker

An ultra-compact passive loudspeaker for use where compact size is as important as sonic performance. The EMS-51 is a compact two-way multipurpose loudspeaker intended for a variety of applications – either as a stand-alone product, or else with the incorporation of i-8 or EMS-112 subwoofers to make a truly fullrange system.


Gentle 12dB/octave low frequency roll off

75° conical dispersion allows vertical or horizontal orientation

Premium 12mm multi-laminate birch plywood enclosure

Black or white textured paint finish

Optional weather protection or RAL custom colours

Multiple threaded rigging and mounting points

Perforated steel grille

Horizontal and vertical mounting yokes supplied

The EMS-51 is completely passive, yet outperforms many bi-amplified or DSP-processed designs. The enclosure contains a 5” (127mm) LF drive unit, linked via the internal passive crossover network to a 1.1” (28mm) diaphragm HF soft dome drive unit which produces a 75° conical dispersion pattern. Unusually for a loudspeaker of this size, it is an infinite baffle design which gives a smoother LF rolloff and a much more robust LF performance than would be expected from an enclosure of this size.


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.


PSA Audio Visual Ltd.

28 Vision Business Park,

Preston Place,

Upper Caldecote.

SG18 9GQ

Copyright 2017 PSA Audio Visual Ltd.

PSA Audio Visual Limited. Registered office: 28 Vision Business Park, Preston Place, Upper Caldecote, SG18 9GQ. Registered in England. Registered number: 11394691.