Genz-Benz neo-pak 3.5 ユーザーガイド
FRONT PANEL
INPUT – The NEO-PAK 3.5 is equipped with a standard ¼” unbalanced input. Input sensitivity can be switched from
approximately 300 mV to 1.25 volt. The input impedance is 500k ohms. The precision input scaling preamp contains
a 36 Hz, 12 dB/octave high pass fi lter (more effective and less intrusive than the more common 6 dB fi lters) and an
“RFI” fi lter (radio frequency interference) to eliminate unwanted noise. The input gain stage consists of a feedback
type circuit that provides continuously variable gain with minimal noise. The input preamp contains 12AX7 tube
circuitry based on our highly regarded GBE series touring amplifi ers.
approximately 300 mV to 1.25 volt. The input impedance is 500k ohms. The precision input scaling preamp contains
a 36 Hz, 12 dB/octave high pass fi lter (more effective and less intrusive than the more common 6 dB fi lters) and an
“RFI” fi lter (radio frequency interference) to eliminate unwanted noise. The input gain stage consists of a feedback
type circuit that provides continuously variable gain with minimal noise. The input preamp contains 12AX7 tube
circuitry based on our highly regarded GBE series touring amplifi ers.
PASSIVE/ACTIVE SWITCH – The NEO-PAK 3.5 input stage is equipped with a “passive-active” switch that
optimizes the gain for different pickup types. The active switch engages a -10db pad to the input signal. If your bass
uses a battery then it is an active type pick-up and will yield best performance with the switch in the Active position.
optimizes the gain for different pickup types. The active switch engages a -10db pad to the input signal. If your bass
uses a battery then it is an active type pick-up and will yield best performance with the switch in the Active position.
INPUT SIGNAL MUTE SWITCH – With this mute switch, you can place the amplifi er (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.
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.
PREAMP GAIN CONTROL – This control sets the input sensitivity gain of the 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 fl ashes, 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. The gain control should be set so that the O/L LED fl ashes with the hardest notes played.
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 fl ashes, 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. The gain control should be set so that the O/L LED fl ashes with the hardest notes played.
“O/L” LED – This “Over-load” LED shows the operating status of the preamp stage. When this LED fl ashes,
overdriving of the input gain stages is occurring. Adjusting the Preamp Gain and Volume controls will affect the
over-load condition.
overdriving of the input gain stages is occurring. Adjusting the Preamp Gain and Volume controls will affect the
over-load condition.
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.
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 amplifi er input stage for the type of bass
used and your personal playing style.
1)
used and your personal playing style.
1)
Select either Active or Passive input gain depending upon the bass used.
2)
Set your instruments controls (volume and tone) where you normally prefer to run them.
3)
With the Channel Gain setting at “0” and your amplifi er EQ positions centered at 12 o’clock, begin turning
the gain control up to a level in which the O/L LED is illuminating with your hardest notes played. It is okay
for the RED LED to fl ash consistently BUT it should not be on constantly. Now set your channel volume and
master volume settings for the desired output level (loudness) that you wish to produce.
4)
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.
5)
After setting your EQ it may be necessary to go back and adjust your input gain level 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.
TUNER OUTPUT – The NEO-PAK 3.5 is equipped with a fully isolated Tuner Output. This jack is located after the
front end scaling preamplifi er, but is pre-signal shape and pre-EQ. This output may also be used to drive a separate
front end scaling preamplifi er, but is pre-signal shape and pre-EQ. This output may also be used to drive a separate
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