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General| Input | 1/4" |
|---|---|
| Input Impedance | 1MΩ |
| Speaker Outputs | 1/4" |
| Controls | Gain, Master Volume |
| EQ | 4-band EQ |
| Voicing Filters | Contour |
| Direct Out | XLR |
| Outputs | 1/4" |
Lists the items that should be included with the 400RB Head and Combos.
Provides Gallien-Krueger's address, phone, fax, internet, and email for support.
Explains the active EQ circuits for fine-tuning tone, emphasizing small adjustments for significant sound changes.
Details how the Contour control scoops mids while boosting highs and lows for a unique GK sound.
Describes the String Bass button's function for adjusting low-end response for four or five-string basses.
Explains the Boost control for adding 'growl' and the Master control for output level adjustment.
Covers the low-noise, balanced direct out for PA/recording, including Pre/Post EQ and Ground Lift switch functions.
Ensures correct voltage and amperage requirements are met to prevent hazards and amplifier damage.
Advises on connecting to appropriate circuits to avoid tripping breakers or power variations.
Warns against using extension cords and recommends using only the supplied power cord.
Instructs on proper handling of the AC power cord, including unplugging by the plug.
States there are no user-serviceable parts inside and opening poses a shock hazard.
Suggests saving carton and packing materials for future shipping or transport needs.
Provides guidance on placing the unit on a firm surface, rack mounting, ventilation, and avoiding extreme environments.
Advises disconnecting cables and the AC outlet before moving the amplifier.
Details how to clean the unit using a soft cloth and mild soap, avoiding solvents and abrasives.
States that cleaning is the only required maintenance, and recommends a road case for frequent transport.
An electronically balanced output for connecting to a PA system.
Selects the direct out signal to be either before or after the EQ stage.
Standard 1/4" input jack with an input attenuator button for clipping prevention.
Mutes the output to speakers and PA system for tuning purposes.
Sets pre-amp gain after the input stage to optimize headroom.
Includes String Bass, Contour, and Presence controls for shaping the amplifier's tone.
Adjusts treble frequencies with a 7kHz shelving type EQ for edge and definition.
Adjusts high-mid frequencies at 1kHz for punch and string harmonics.
Adjusts low-mid frequencies at 250Hz for the main body of the sound.
Adjusts bass frequencies at 60Hz for low-end push.
Post EQ gain stage using GIVE technology for added 'growl'.
Controls the overall output level of the amplifier.
Send and return jacks for inserting effects before the boost section.
Provides an output signal for connecting to a tuner.
Turns the amplifier on or off, and serves as an emergency shut-off.
Location for the detachable power cord connection.
240W power amp outputs for full-range operation, rated for 4 Ohm loads.
Details the 400RB/112 and 400RB/115 combo models and their speaker setups.
Specifies the maximum load when using the internal speaker, typically one 8 Ohm cabinet.
Specifies the maximum load when the internal speaker is disconnected, allowing for 4 Ohm or two 8 Ohm cabinets.
Highlights key features like high current, active EQ, voicing filters, balanced direct out, and US design.
Explains the importance of high current capacity for controlling speaker cones and maintaining punch at higher levels.
Discusses the unique Gallien-Krueger EQ, optimized for bass frequencies and wired in series for flexibility.
Explains the effect of Contour and String Bass controls on revoicing the amplifier's tone.
Details the Gate Induced Valve Effect technology used in pre-amps for harmonic content.
Explains the temperature-sensitive fan system designed for quiet operation and reliability.
Describes the protection circuits that monitor for unsafe conditions and mute the output.
Discusses the high gain, high headroom, low noise input stage for reduced hiss and noise.
Thanks the reader and provides contact information for comments and feedback.
Visual representation of the amplifier's signal flow and component connections.
Details the amplifier's power output ratings at different impedances (8 Ohms and 4 Ohms).
Covers maximum input level, input impedance, and send/return impedances.
Lists the frequency points and boost/cut ranges for the Bass, Lo-Mid, Hi-Mid, and Treble controls.
Specifies the frequency points for String Bass and Contour controls, and boost/cut for Presence.
Provides the noise specification, measured in dB referenced to 240W with A-weighting.
Describes the cooling system as a continuously variable-speed fan.
Lists protection features including short circuit, thermal, RF, and load stability.
Provides the physical dimensions of the unit, noting it occupies 2 Rack Spaces.
States the total weight of the amplifier unit.
Lists voltage and wattage requirements for different regions (USA/Canada, Europe, Japan).
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