Rock-Bottom 400
The Gallien-Krueger 400RB is a solid-state bass amplifier head renowned for its punchy, articulate tone and reliability. Delivering 200 watts at 4 ohms, it features a four-band active EQ, boost control for added growl, and a unique voicing filter. Its compact, rugged design and fast transient response make it a favorite among professional bassists for both studio and live use.
Fender Model Guide
A portable bass amplifier design that balances punch, clarity and practicality. Fast transient response and focused mids help bass lines remain defined in a busy mix.
- VOLUME Adjusts signal level in preamp stage.
- TREBLE Adjusts high frequencies.
- HI-MID Adjusts high midrange frequencies.
- LOW-MID Adjusts low midrange frequencies.
- BASS Adjusts low frequencies.
- MASTER Adjusts overall volume level.
- LO CUT Reduces lower signal frequencies.
- MID CONTOUR Cuts mid-range frequencies and boosts lows and highs.
- HI BOOST Boosts frequencies above 1kHz.
- BOOST Controls amount of boost added to signal.
- BOOST SWITCH Enables boost circuit.
Also included as an amp head only.
From the Fender Tone Master Pro Model Guide
- Based on
- Gallien-Krueger 400RB
- Real gear released
- 1983
- Amp type
- Solid State
- Power (watts)
- 200
- Speakers
- 4x10
Unofficial fan reference by Worship Calling. Not affiliated with or endorsed by Fender. Tone Master Pro is a trademark of Fender Musical Instruments Corporation. Other product names belong to their owners and are used only to identify the gear each model is based on. Details are a guide, so check the Fender manual for exact controls.