EM Acoustics MSE-159SP self-powered fullrange loudspeaker - Manual (Page 8)

Page 8 of 25
MSE-159SP User Manual
v1.0 May 2012
2.0 – The MSE-159SP Loudspeaker
The MSE-159SP is the self-powered variant of the MSE-159 loudspeaker, and as such
follows all the same principles in design and operation. The MSE-159SP is unique in that it
is a
powered-passive loudspeaker – whereas alternative products might remove the
passive crossover and use a two-channel amplifier and active crossover, we believe that
the passive crossover forms part of the signature of the loudspeaker itself. As such, a
monobloc amplifier is used and drives the passive network, keeping the sonic performance
of the powered and non-powered variants as close as possible.
The two-way design utilizes a powerful 4” voice coil 15” (381mm) neodymium LF drive
unit, and a 4” diaphragm, 1.4” (36mm) exit HF compression drive unit coupled to a 90 x
60 rotatable waveguide. This combination, along with the signature EM Acoustics passive
crossover network provides unprecedented frequency and phase response from a two-way
loudspeaker, as well as reliable and predictable coverage from the loudspeaker.
The MSE-159SP loudspeaker is designed and manufactured in our UK headquarters, and
rigorously tested before they leave the factory. All flying hardware is designed and
manufactured to exacting standards for both ease of use and user safety.
2.1 – Rotating the HF waveguide
1. Remove the front grille as described in the Maintenance section on Page 10 of this
manual.
2. Using a 4mm Allen key, remove the eight countersunk bolts retaining the HF
waveguide in place.
3. Lift the waveguide up and rotate to the desired position – the label on the waveguide
shows the dispersion orientation.
4. Reinstate the socket-head bolts and retighten. Avoid over-tightening as this may crack
the waveguide.
5. Reinstate the grille as described in the Maintenance section on Page 11.