Operating
Instructions
800RB
Operating Instructions 800RB
The Basics
Your new GK 800RB Bass Amplifier represents the latest advances that technology has to offer. Contained in a small lightweight package are a set of unbeatable voicing filters, a four-band equalizer, a tunable electronic crossover and a bi-amp power amplifier. When used properly, these features will give you the most exciting bass sound available today. A careful examination of this manual will help you understand how to take full advantage of its capabilities.
Block Diagram
Direct Out
This is an electronically balanced output that will put 500mv rms into a 600 ohm load. It comes after the effects loop and is located on the rear panel.
Speakers
Located on the rear panel are two sets of speaker jacks. The upper set is for the 100W power amp and in the bi-amp mode is used for the high end. They deliver 100W rms into 8 ohms. Lower impedances should not be used. Higher impedances such as 8 ohms or above are okay.
Input Section
This section contains the 1/4'' input jack and the input attenuator. With the attenuator out, the maximum input level is 1V rms (3V P-P). For larger input signals, the input attenuator should be set. This reduces the gain of the input stage by 10dB, increasing the input head room to 3V rms (10V P-P).
Effects Loop
Located on the rear panel, it is provided for the insertion of outboard effects. It is post EQ but pre Boost and Master. Using standard guitar cords, connect the effects input to the send and the effects output to the return. The Boost and Master controls will not effect any signal put into the return jack. The level is 1.5V rms (4.5V P-P) into 100K ohm.
CAUTION : Under no circumstances should the 100W and 300W outputs be connected together or to the same speaker!
Power Switch
The Power Switch and associated LED indicator are located in the lower right hand corner of the front panel
Fuse
Located on the rear panel, never operate this amplifier with any other than the recommended fuse :
115V operation - replace with Type 3AG7A
230V operation - replace with Type 3AG4A
Power Cord
The Power Cord is detachable and plugs into the rear panel socket. If a replacement is used it should be UL rated for 10A, 125V operation. If using 240V, the cord should be UL rated for 240V, 5A operation.
Maintenance
Your new amplifier is rugged. It was built to give you a lifetime of trouble-free operation. If it is operated in accordance with the
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