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EM Acoustics EMS-51X - Ultra Compact 2-Way Passive Loudspeaker - Black

£594.00 inc. vat
£495.00 ex. vat
Please contact us for availability.

EM Acoustics EMS-51X

The EM Acoustics EMS-51X is a ultra-compact, two-way passive loudspeaker deigned for compact solutions where SPLs are still required. Utilising EM Acoustics latest crossover topologies and the utmost in drive unit technology, this loudspeaker is completely passive yet outperforms many bi-amplified or processed designs.


  • Astonishing LF performance for enclosure size
  • Premium plywood cabinet for sonic benefit over plastic
  • 5” neo LF/1.1” silk dome HF drive units
  • True passive design – no corrective DSP required
  • Sealed enclosure gives gentle 12dB/octave LF roll off
  • Flexible rigging and mounting options
  • Horizontal yoke included
  • Impact and weather resistant black or white polyurethane finishes as standard

Like its predecessor, the EMS-51X is a two-way passive loudspeaker, using a 1.25” voice coil 5” (127mm) neodymium low frequency transducer. This low frequency drive unit is coupled via the internal passive crossover network to a 1.1” (28mm) diaphragm, studio-grade soft dome high frequency transducer. The enclosure is an infinite baffle design – unusual for a loudspeaker of this size – which gives a much smoother LF roll off and a much more robust low frequency performance than would be expected from an enclosure of this size. Consequently, in some applications the EMS-51X can be used without subwoofer support for lower SPL requirements.

The drive units are housed within a compact, sealed enclosure constructed from premium 12mm (1/2”) multi-laminate Birch plywood, intelligently braced to
minimise panel eflection. Updated cabinet geometry, 5-axis machined for a modern aesthetic, brings the EMS-51X right up to date. Three M8 threaded fixings are incorporated around the enclosure (one top, one bottom and one on the rear) for attachment of rigging hardware and safeties. The enclosure also includes a pair of Neutrik® speakONTM NL4 connectors for input and enclosure link. Lastly, a hex punched steel grille backed with acoustically transparent fabric protects the drive units from damage as well as providing a smart and discreet appearance. The grille can be quickly removed for service purposes. The enclosure is finished in impact and weather resistant black or white polyurethane as standard, and RAL colour matching options are also available.

The EMS-51X is ideal for fills and delays, theatrical spot effects, and corporate and A/V use. Due to its discreet appearance and exceptional performance, the EMS-51X will also find use in high-end domestic A/V systems and studio monitoring. For ease of use, the EMS-51X comes packaged the YK-51X horizontal mounting yoke; other mounting and rigging options are available as options.

The EMS-51X requires a single amplifier channel and should be used with professional power amplifiers capable of delivering 300-500W RMS into an 8-ohm load. For optimal results, amplifiers from within EM Acoustics’ own product range should be used.


  • Enclosure Type: Two-way passive, infinite baffle
  • Dimensions (HxWxD), mm/ins: 250 (9.9) x 140 (5.5) x 169 (6.7)
  • Net/Shipping Weight: 3.5/4kg (7.7/8.8lbs)
  • Frequency Response: 80Hz – 20kHz ± 3dB
  • Sensitivity: 89dB
  • Dispersion: 75° conical
  • Drive Units
    • 5” (127mm) neodymium LF cone drive unit
    • 1.1” (28mm) HF soft dome tweeter
  • Loudspeakers per amplifier
    • DQ6: 4 per channel, DQ10: 4 per channel, DQ20: 4 per channel
    • Di6D: 2 per channel, Di10D: 3 per channel, Di20D: 3 per channel
  • Power Handling: 200W RMS, 400W program
  • Maximum SPL: 113dB continuous, 119dB peak
  • Nominal Impedance: 8 ohms
  • Crossover: Asymmetric internal passive
  • Connectors: 2 x Neutrik® speakONTM NL4
  • Enclosure: 12mm (1/2”) multi-laminate Birch plywood – rebated, pinned and glued. Finished in impact and weather resistant black or white polyurethane
  • Rigging & Hardware: 3 x M8 threaded mounting points
  • Grille: Hex-punched steel backed with acoustically transparent fabric
  • Options: Colours, connector options
  • Accessories: YK-51X horizontal flying yoke, BM-41 ball joint adapter, WP-41 wall plate, WMS50 wall bracket
  • Spare Parts: DU-502 5” drive unit, SD-1001 1.1” HF soft dome tweeter, PX-51X passive crossover assembly, RFG-51X replacement grille