7
6.
CONNECTION
The TRAILSB6T operates into high or low impedance. For this reason, it has a rear
panel fitted with a 5-position switch for operating-mode selection. The first four
positions enable the system to operate into high impedance mode, and the fifth is
for low impedance.
The four positions of the power selector for the 70/100 V line allow the maximum-
power configuration at which each unit operates. Therefore, the lower positions
are used in areas requiring low SPL (7.5 W or 15 W) and the upper positions are
for areas requiring higher levels (30 W or 60 W).
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 fifth position corresponds to low-impedance operation (8 Ω) and a maximum
power of 60 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 Ω. 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 V/100 V network, in the 8 Ω position,
it will be seriously damaged.