Maintenance; Ems-122 Drive Unit Service - EM Acoustics EMS-122 User Manual

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-122/122w: Low Frequency Drive Unit
1. Using a 3mm Allen key, undo the four M4 machine screws top & bottom of the enclosure (2 each end). Gently
remove the grille from the front of the enclosure.
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. Reinstate the grille by gently placing it in place over the front of the loudspeaker. Replace the four M4
machine screws to secure it in place.
EMS-122/122w: High Frequency Drive Unit
1. Follow the procedure above to remove the front grille.
2. Using a 4mm Allen key, remove the eight M6 countersunk socket-head bolts holding the waveguide in place.
Gently disconnect the cables from the drive unit and remove the unit from the enclosure.
3. To reinstate the drive unit, gently reconnect the cables (white cable to positive terminal, yellow cable to
negative) and insert back into position. Note the waveguide orientation for correct dispersion. Replace the
four bolts and gently tighten.
4. Reinstate the grille by gently placing it in place over the front of the loudspeaker. Replace the four M4
machine screws to secure it in place.
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EMS-122/122w User Manual
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