Rear Panel Controls - Gallien-Krueger 1001RB Owner's Manual

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The power cord is detachable and plugs in here.
540W power amp output for Full-Range operation only.
They deliver 540 watts into 4 Ohms. Lower impedances
should not be used. Each jack has a minimum of 8 Ohms
each. Higher impedances such as 8 Ohms, 16 Ohms, or
No Load are acceptable. No damage will result from
operating the amplifier with the speakers disconnected.
Enables BI-AMP operation by connecting a GK-RBH
Series cabinet with the provided 4 conductor Speakon
cable. This connects the 50W amplifier allowing the
Tweeter control on the front panel to control the signal
going to the horn. See Bi-Amp and Normal Operation
on page 7 for more information.
Do not connect a Speakon cable labeled "Bridge
Mode" to the 1001RB. This may result in damage to the
amplifier.
One 4 Ohm or two 8 Ohm cabinets on the 540W Amp.
One or two 8 Ohm horns on the 50W Amp.