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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.
M-12: Low Frequency Drive Unit
1. Using a PZ2 screwdriver, undo the three countersunk machine screws on each side of the loudspeaker – this
will allow you to remove the front grille.
2. Using a 5mm Allen key, remove the six 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! You may find you need to insert a flat bladed
screwdriver between the drive unit and recess to aid in lifting it out. 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 positioning it in place and gently pressing it into position. Note the cut-away parts of
the side flange of the grille – this cutout fits over the HF waveguide. Once the grille is in position, replace the
six bolts finger-tight, before tightening again with a PZ2 screwdriver.
M-12: High Frequency Drive Unit
1. Using a PZ2 screwdriver, undo the three countersunk machine screws on each side of the loudspeaker – this
will allow you to remove the front grille.
2. Using a 4mm Allen key, undo the eight bolts holding the HF waveguide in place. Once these are removed,
gently lift the waveguide out of the enclosure. Disconnect the cables and the drive unit is now free to be
removed.
3. To remove the drive unit from the waveguide, undo the four nuts that attach the drive unit to the waveguide
using a 13mm spanner.
4. To reinstate the drive unit, reconnect the cables (white cable to positive terminal, yellow cable to negative)
and carefully replace the waveguide into its hole. Retighten the mounting bolts.
5. Reinstate the grille by positioning it in place and gently pressing it into position. Note the cut-away parts of
the side flange of the grille – this cutout fits over the HF waveguide. Once the grille is in position, replace the
six bolts finger-tight, before tightening again with a PZ2 screwdriver.
8
M-12 User Manual
www.emacoustics.co.uk
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