GTS 300 is a car audio amplifier of JBL at 90s. Its deliver 100 watts at 4 Ohm load but 300 Watts for bridge amplification at 4 Ohm load.
Inside of car power amplifier:
SCHEMATIC DIAGRAM
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INFO
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JBL GTS 300 CAR AMPLIFIER
GTS 300 is a car audio amplifier of JBL at 90s. Its deliver 100 watts at 4 Ohm load but 300 Watts for bridge amplification at 4 Ohm load.
Inside of car power amplifier:
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x
X
That looks like the GTS 600 in the image, its virtual the same amplifier as the 300 but with twice the transistors, capacitors and transformer section in one chassis,