EM Acoustics EMS-118 reflex subwoofer - Manual (Page 7)

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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.