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Boss Audio Systems GT 1180 User Manual

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10
11
GROUND
To REMOTE TURN-ON
from HEAD UNIT
To BATTERY
++
CH4
SPEAKER
++
CH3
SPEAKER
++
++
CH2
SPEAKER
CH1
SPEAKER
Four Channel Speaker Wiring
GROUND
To REMOTE TURN-ON
from HEAD UNIT
To BATTERY
Bridged Speaker Wiring
+
+
+
+
RIGHT SPEAKER
(SUBWOOFER)
LEFT SPEAKER
(SUBWOOFER)
SPEAKER IMPEDANCE
4 - 8 OHMS!
SPEAKER IMPEDANCE
4 - 8 OHMS!
Dual Tri-Mode Speaker Wiring
Four Channel Amplifiers
GT 1180, GT 1380, GT 148 0
GROUND
To REMOTE TURN-ON
from HEAD UNIT
To BATTERY
+
+
+
+
+
+
CH 3
SPEAKER
CH 2
SPEAKER
SUBWOOFER
SUBWOOFER MINIMUM
IMPEDANCE 8 OHMS!
+
+
SUBWOOFER
+
+
+
+
CH3
SPEAKER
CH 4
SPEAKER
CH 1
SPEAKER
SPEAKER 
IMPEDANCE
4 - 8 OHMS!
SPEAKER IMPEDANCE
4 - 8 OHMS!
SUBWOOFER MINIMUM
IMPEDANCE 8 OHMS!
HIGH PASS FILTERS
 (CAPACITORS)
LOW  PASS FILTER 
(INDUCTOR)
HIGH PASS FILTERS
 (CAPACITORS)
LOW  PASS FILTER 
(INDUCTOR)
Tri-Mode Operational Output is a unique feature which allows a subwoofer to be operated in MONO 
mode, while the main speakers are playing STEREO simultaneously on one pair of amplifier output
channels.
To engage the amplifier in this mode, place the Crossover (Subwoofer) switch in the FULL position.
Use a 100V non-poplar capacitor for a high pass crossover and a wire coil inductor to block high 
frequencies from the subwoofer, as shown in the figure below. Please review the table below for 
inductor and capacitor component values to determine the desired crossover frequencies.
Four Channel Amplifiers
GT 1180, GT 1380, GT 148 0
Four Channel Amplifiers
GT 1180, GT 1380, GT 148 0