User manual

10
EMS-51 User Manual
www.emacoustics.co.uk
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-51: Low Frequency Drive Unit
1. Using a #2 Phillips head screwdriver, undo the countersunk M4 screws top & bottom of the enclosure (1 each
end). Gently remove the grille from the front of the enclosure.
2. Using a 3mm Allen key, remove the four M4 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. Check the gasket on the driver chassis is
complete before installing it back into the enclosure. 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 two
countersunk M4 machine screws to secure it in place.
EMS-51: High Frequency Drive Unit
1. Follow the procedure above to remove the front grille.
2. Using a #1 Pozidrive screwdriver, remove the three screws securing the drive unit 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. Ensure that the insulation on the crimp connectors is covering the
terminal itself. Note that the terminals fit into the recess in the enclosure towards the bottom of the
loudspeaker. Also ensure the gasket is complete around the drive unit before tightening the screws.
4. Reinstate the grille by gently placing it in place over the front of the loudspeaker. Replace the two
countersunk M4 machine screws to secure it in place.