4-band active EQ, adjustable contour, effects loop, Boost valve effect, XLR out with ground and pre/post switch, and tuner out. The Gallien-Krueger Backline 600 Bass Head can handle the wear and tear of touring. Heres the place you can go to ask tube amplifier questions. Gallien-Krueger Backline 600 Bass Head 300W 4 ohms.
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