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EMS-118 User Manual
www.emacoustics.co.uk
DSP Settings
The EMS-118 requires at the minimum an active low pass filter to function correctly. The settings below are given
as a starting point –as the user you are given maximum flexibility to adjust for your taste. To protect the drive
unit, it is also advisable to apply a high pass filter to the system to protect the EMS-118 drive unit from over-
excursion from frequencies it cannot reproduce. The higher you raise the high pass filter on an EMS-118, the more
headroom and overall sound pressure level output there is available. For most medium-to-high level applications,
we would recommend a minimum of a 30Hz high pass filter with a 24dB/octave slope to sufficiently protect the
loudspeaker. For higher SPL applications, we would recommend raising this filter –we would stress that the
higher the filter, the safer the loudspeaker will be. If you are in any doubt over suitable settings for your EMS-118,
please don’t hesitate to contact EM Acoustics or your local dealer for support and advice.
EMS-115: High Pass Filter: 30Hz, 24dB/Octave Linkwitz-Riley
Low Pass Filter: 120Hz maximum, 24dB/Octave Linkwitz-Riley
MAINTENANCE
Your EM Acoustics loudspeakers have been rigorously tested before they leave our factory, to ensure that they give
you a lifetime of flawless operation. Should any of your drive units fail and need replacing, please follow the
guidelines below.
EMS-118: Low Frequency Drive Unit
1. Using a PZ2 screwdriver, remove the pan-head screws securing the front grille in place.
2. Using a 5mm Allen key, remove the eight M6 socket-head bolts holding the drive unit in place, and keep them
safe –ensuring you have collected both the shake-proof and flat washers for each bolt. Gently lift the drive
unit out of its locating hole –please take care as it is heavy! Carefully disconnect the cables from the drive
unit.
3. To reinstate the driver, simply reverse the above procedure. Please observe the correct polarity –red cable to
positive terminal, black cable to negative.
4. Replace the front grille taking care to line the screw holes up. The replace the screws and tighten up.
