Genz-Benz shuttle 6.0 ユーザーガイド

INPUT – The SHUTTLE 6.0® is equipped with a standard ¼” unbalanced input. The input sensitivity range is from 

300 mV to 1.25 volts. The input impedance is >500k ohms. The input stage contains a precision high order ac-

tive high pass filter (more effective and less intrusive than the more common 6 dB filters) and an “RFI” filter (radio 

frequency interference) to eliminate unwanted noise. The input gain stage consists of a feedback type variable gain 

circuit that provides wide range, continuously variable gain with minimal noise. The preamp contains a FET input 

amp circuit based on our highly regarded GBE series touring amplifiers.

INPUT SIGNAL MUTE SWITCH – With this mute switch, you can place the amplifier (and Direct Output) in standby 

mode between sets, without having to change any of your amp settings.   This feature can also be used for silent 

tuning since the Tuner Out stays active when the mute is engaged. A red LED indicates when the Mute is active. 

This function is also foot-switchable from the optional 4 button footswitch. The switch on the amplifier’s faceplate 

must be in the “out” position for the footswitch to work properly.

PREAMP GAIN CONTROL – This control sets the input sensitivity gain of the 12AX7 TUBE preamp to the output 

of your bass. The volume of the signal is then controlled by the Tube Preamp Volume control and also the Master 

Volume control.  If the red overload “OL” LED flashes, the tube preamp stage is being overdriven. To retain a clean 

tone, increase the Preamp and or Master Volume controls and reduce the Preamp Gain control to eliminate input 

preamp overload. Note that overdriving the input tube gain stage may be a desirable tonal characteristic of your 

playing style. This control, in conjunction with the Preamp/Master Volume controls, allows you to set the amount of 

tube overdrive your amp produces.  For clean operation, the gain control should be set so that the O/L LED flashes 

with only the hardest notes played.

“O/L” LED – This “Over-load” LED shows the operating status of the preamp stage. When this LED flashes, over-

driving of the input gain stage is occurring. Adjusting the Preamp Gain and Master Volume controls will affect the 

over-load condition.  Again, over-driving the tube pre-amp may be a desirable tone for your playing style.

PREAMP VOLUME CONTROL – This control sets the volume of the preamp after the Input and Tube Gain stages 

and before the Master Volume control. Use this control in conjunction with the Gain Control.

SETTING YOUR INPUT SIGNAL – Use the following guidelines to set your amplifier input stage for the type of bass 

used and your personal playing style.

1) Set your instruments controls (volume and tone) where you normally prefer to run them.

2) With the Channel Gain setting at “0” and your amplifier EQ positions centered at 12 o’clock, begin turning  

the gain control up to a level in which the O/L LED is just illuminating with your hardest notes played.  It is okay for 

the RED LED to flash somewhat BUT it should not be on constantly unless an overdriven tube tone is desired.  Now 

set your master volume settings for the desired output level (loudness) that you wish to produce.  

3) Now, turn your attention to the EQ section and make the adjustments for the desired tone.  Because this is  

 

an active EQ network any large settings of cut or boost will affect the gain level of the preamp and the O/L  

 

lights at the input stage.  

4) After setting your EQ it may be necessary to go back and adjust your input gain level down accordingly.  It should  

be noted that the Global Signal Shape circuits will not affect the input gain BUT will affect the Master output  

 

level and clip indicator if used with extreme settings.

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