7
6.
CONNECTING
ePHS30Ti operates into high or low impedance. For this reason, it incorporates a
power selector located on the rear panel. As supplied, this connector can be used
pre-configured for operation with a 70/100V 30 W line.
Figure 1: rear panel’s power selector
Note:
If the loudspeaker is used in 70V installations, the corresponding powers for
the 100V position will be reduced to half those indicated on the switch. To one
quarter for 50V installations.
The low-impedance connection will allow the loudspeakers to be configured for
operating under these conditions with a maximum power of 250 W. If this setup is
adopted, consideration must be given to amplifier limits when several
loudspeakers are connected to its output, especially if the overall impedance is
below 4
. Furthermore, it is important that the cable connecting the amplifier
outputs to the loudspeakers is of good quality and as short as possible; this is of
special significance when long distances have to be covered and loudspeaker
impedance is low.
Note:
The loudspeaker distribution along a 70/100V line historically arises from
the technical requirement to mix loudspeakers of different impedances and/or
powers on the same amplification line or channel, but without any need to worry
about the total impedance of the full assembly. Moreover, this solution enables
long cable runs with significantly smaller sections that those usually employed in
low-impedance installations, but with minimum power losses.
WARNING!
If the system is accidentally connected with the switch in the 100 V/60
W position to a low-impedance amplifier, no damage will be caused to the
loudspeaker, but its performance will be well below its specifications. If the
loudspeaker is accidentally connected to a 70/100 V line, in the 8 Ω, it will be
seriously damaged.
