6
EMS-112 User Manual
www.emacoustics.co.uk
Cabling and Amplifier Selection
The EMS-112 is designed to be used with professional power amplifiers providing the following power outputs:
EMS-112
1000W/channel
into eight ohms
It is good practice to use an amplifier equal to the program power rating of the loudspeaker – so as to retain
sufficient headroom and good dynamic range. Care should be taken during operation to avoid amplifier clipping –
as this can cause serious damage to your loudspeakers. If in doubt, please contact your dealer who will be happy
to assist you in correct amplifier choice and setup.
Cabling
The EMS-112 is supplied with Neutrik SpeakON
TM
NL4 connectors, wired pin 1+/1-. It is recommended that the
resistance of your cable is less than one tenth of the nominal system impedance. Given below are the
recommended maximum cable lengths for different cross-sections and impedances.
Conductor Cross Sectional Area
Maximum Recommended Cable Length
4 ohms
8 ohms
16 ohms
1.0mm
2
11m
22m
44m
1.5mm
2
17m
34m
68m
2.0mm
2
22m
44m
88m
2.5mm
2
29m
58m
116m
4.0mm
2
44m
88m
176m
6.0mm
2
66m
132m
264m
Pins 2+/2- on the SpeakON
TM
connectors are wired together to allow link-through with 4-core cables. The high
pass output connector is wired on pins 1+/1-, with pins 2+/2- on this NL4 having no connection.
DSP Settings
The EMS-112 requires no DSP processing to function correctly. In extreme SPL applications, additional protection
can be given to the drive unit by applying a 24dB/Octave high pass filter at 35Hz, which will protect the drive unit
from over excursion. If you are in any doubt over suitable settings for your EMS-112, please don’t hesitate to
contact EM Acoustics or your local dealer for support and advice.
A small power amplifier working too hard is more likely to damage a loudspeaker than a large power amplifier
working within its operating range!
