400RB-IV Series
Front Panel Controls
Presence:
1-Balanced Direct Out:Adds edge and definition to higher frequencies.
Front Panel ControlsAn electronically balanced output, that you can runActive Equalization:
to your P.A. system.7-Treble:
2-Ground/Lift:Boost and cut at 7 kHz +14dB shelving type. Add or
This switch disconnects the ground on the balanced,remove edge and definition.
XLR output to eliminate hum and buzz when8-High Mid:
connnecting to equipment that is running on aBoost and cut at 1 kHz +6dB/ -10dB, ?Q Optimized,?
different ground system.band pass type. Works on lower string harmonics,
Pre/Post EQ Button:and effects the punch of your sound.
Selects the direct out signal before or after the EQ.9-Low Mid:
3-Input:Boost and cut at 250Hz +6dB/-10dB, ?Q Optimized,?
A standard 1? input jack to plug in active or passiveband pass type. Works on the main body of your
basses using a shielded cord.sound.
4- -14dB Pad:10-Bass:
Input attenuator button. The button is generally leftBoost and cut at 60Hz +10dB, shelving type. Controls
out, except in rare cases when the clip LED flashes.low end push.
This switch should be pressed if the CLIP LED stays on11-Boost:
continuously. It may be necessary to ?pad? the inputA post EQ gain stage using GIVE technology which
if you are using a bass with active electronics or veryadds ?growl? as it is turned up.
high output.12-Master:
Clip LED:Controls the output level of the amplifier.
LED lights yellow when the input stage is being13-Effects Loop:
over-driven. If -14dB PAD is pressed and clipSend and return jacks provided for the insertion of
LED still stays lit, turn down the volume oneffects after the EQ, but before the boost section.
your bass.Some effect units have gain, turning the BOOST
Tuning Mute Button:down, will compensate for this.
Set this switch to ?On? when tuning up. No signal14-Tuner Output
will be sent to the speakers, or the P.A. system.Output comes directly off the input stage and can be
Mute LED:patched to a tuner with a shielded patch cord. This
LED turns on when ?Tuning Mute? is switchedoutput is unaffected by the Tuning Mute Feature.
to the ?ON? position.15-Power/Protect LED:
5-Volume:The LED is red at turn-on for five seconds while
Sets pre-amp gain after the input stage. It is used inthe amp powers up. The LED turns blue when
conjunction with the input pad, to optimize thethe amp is ready to play. Should the amp
amplifier?s headroom.experience a fault (over heat, over current) the
6-Voicing Filters:amp will mute and this LED will switch to red
4/5 String Bass:until the condition is corrected. This LED turns
Setting this button to the ?ON? position, voices theoff when the power switch is turned off.
pre-amp for basses with ?B? tuning (5 string bass).16-Power Switch:
Leaving it in the ?Out? position will voice the ampTurns the amplifier on or off. Should a problem
like the 800RB, for a 4 string bass.occur during operation press this switch out
Contour:first. This turns the amp off, but does not
Drops the mid-range frequencies while boosting lowscompletely disconnect the power from the AC
& highs.mains. The power LED should be off at this
point.
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ACEC
