JBL Grand touring series User Manual page 6

System Design Using the GTSl80x
Speaker Requirements
When used in the non-bridged
mode the GTS180x can easily
drive 2-ohm speaker loads. When
only one speaker is connected to
each channel, virtuallv anv
conventional speaker can be
used. When two speakers are
connected in parallel to a given
channel, each speaker must have
a minimum impedance of at
least 4 ohms. This ensures that
the combined load will not drop
below 2 ohms. Although the
amplifier will not be damaged,
load impedances lower than
2 ohms will eventually cause the
amplifier to overheat, activating
the Protection circuits and
causing the unit to shut off until
it cools down sufficientlv.
Parallel Wiring
(+I
8 Ohms
Nomtnal
Impedance
When the GTS180x is in bridged
The GTSlEOx must not be used
mode, the combined impedance
with speakers that have either
of the speaker (or speakers) con-
one of their input terminals wired
netted to the bridged channel
to the frame of the speaker or to
should be at least 4 ohms.
the chassis of the vehicle.
Sustained operation of the
GTSl8Ox in bridged mode with
less than 4 ohms will likely cause
overheating. If monaural ooera-
tion is desired, and two 4 ohm
speakers are used, it is best to
connect each speaker to an indi-
vidual amplifier channel and use
the "L+R" mode on the input-
mode switch to provide monaural
operation.