Gallien-Krueger Plex

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The Plex Preamp

The Plex preamp from Gallien-Krueger combines 47 years of amp design experience with state of the art technology to deliver the flexibility today’s musicians require.
The heart of every GK product is the active 4 band “variable Q” equalizer and contour circuit that set the standard for bass tone shaping over 30 years ago. Building on this proven foundation, the PLEX features expanded filter options that allow you to further dial in your instruments unique voice.
Foot switchable Compressor and Overdrive ensure your performance blends seamlessly into the band or cuts through a crowded mix and the Chromatic Tuner makes sure it’s all in tune. The ¼” output drives the front of your instrument amp or power amplifier while the DI output sends it all to the PA or recording console. Aux IN and Phones Out make the PLEX ideal for jamming along silently with your favorite tunes and the USB input/output allows pristine digital recording and re-amping capability when used with your favorite recording software.
Expanded Voicing Options: Every knob of the PLEX features push activated functions that allow the user to tailor every nuance of their sound beyond the range of traditional tone controls. As each knob is pressed, the indicator is lit blue to signify that an option is engaged and the readout displays the current option level that is active. Need more low end thump? Push the bass/ bump knob to engage multiple levels of bass enhancement. Scooping out some mids for the ultimate slap tone is as easy pressing the low-mid/contour knob until you find just the right notch. Get rid of excessive pick noise and click by pressing the hi-mid/ hi-cut knob. Add just the right amount of “air” to a dark instrument or speaker via the presence function accessed by pressing the treble/presence knob.
No amp? No worries: Obviously, the pedal board friendly format, distortion, compressor and chromatic tuner with large LED display make PLEX an “all in one” extension of your existing live amp rig. But let’s face it, not every session or live performance has the need or capacity to allow for your favorite GK rig running at gig volume. The convenience of tracking direct and the use of in-ear monitors on stage has many players leaving their amps at home. With its world class preamp and virtually unlimited tone shaping, wide range of analog and digital input/output options, PLEX allows you to have your Gallien-Krueger sound even when an amp is not in the cards.

Main Features

  • Four band active EQ and Contour
  • Selectable Voicing options for expanded tone shaping
  • Compressor with variable level, threshold, ratio, attack/release and gain reduction indicator
  • Chromatic Tuner with large LED display
  • Overdrive with variable volume and drive level with multiple symmetry and voicing options
  • Aux Input
  • Phones output
  • Direct XLR output with ground lift and Pre/Post selector
  • 1/4″ line output
  • USB in/out for direct recording and re-amp capability
  • Effects send/return

Specs

Outputs

USB
Digital in/out provides recording, playback and re-amp capability with USB equipped recording systems and allows user to install firmware updates.
Aux
3.5mm analog input for MP3 or other audio playback device. Signal is introduced after EQ and processing, prior to the Master Volume.
Phones
3.5mm output for monitoring output through headphones
DI
Electronically balanced output for connection to mixer or other XLR equipped device using a standard microphone cable
Output
¼” analog output for connection to amplifiers, mixers as well as other pedals that are equipped with ¼” inputs.
Send
¼” analog output that enables the PLEX signal to be sent to external devices after EQ and other processing, prior to the Master Volume
Return
¼” analog input allows external signal to be input into the PLEX after the EQ and other processing, prior to the Master Volume.
Input
¼” analog input to receive instrument signal.

Knobs

Trim/Clip
The Trim knob adjusts the level of signal coming in from the ¼” input. The Clip ring surrounding the Trim knob flashes red when the incoming signal begins to exceed the input circuit’s capability.
Bass/Bump
Rotary control allows the bass frequencies to be boosted or cut. Pressing the knob activates the Bump feature which applies varying levels of low frequency enhancement.
Low Mid/Contour
Rotary control allows the low-mid frequencies to be boosted or cut. Pressing the knob activates the Contour feature to cut varying levels of mid frequencies while boosting low and high frequencies.
Hi Mid/ Hi Cut
Rotary control allows the hi-mid frequencies to be boosted or cut. Pressing the knob activates the hi cut feature which applies varying levels of high freq. reduction to remove unwanted clicking and string noise.
Treble/Presence
Rotary control allows the treble frequencies to be boosted or cut. Pressing the knob activates the Presence feature which applies varying levels of high freq. enhancement
Thresh/Ratio
Activate by the pressing the compressor/tuner button once. Once active the Thresh/Ratio and Level/ Attack knobs are lit Blue. Rotary control sets the threshold at which the compressor is triggered by the incoming signal. Turning the knob clockwise lowers the threshold ( increases the effect ) and counter clockwise settings raise the threshold ( reduces the effect). Pressing the knob activates the Ratio feature which allows the selection of various compression ratios from 2:1 to 20:1.
Level/Attack
Used in conjunction with Thresh/Ratio. Rotary control sets the output volume of the compressor. Pressing the knob activates the Attack feature which selects various attack and release times of the compressor
Level/Drive
Activate by pressing the Overdrive footswitch. Once active the level/Drive knob is lit Blue. Rotary control sets the volume level of the overdrive channel. Pressing the knob allows the selection of multiple Drive intensities.
Master/Voice
Rotary control sets the main output volume. Pressing the knob activates the Voice feature which selects various EQ voicing characteristics.

Switches

Pre/Post
Selects the signal that is sent from the DI output to be before or after the EQ.
Compressor/Tuner
The Trim knob adjusts the level of signal coming in from the ¼” input. The Clip ring surrounding the Trim knob flashes red when the incoming signal begins to exceed the input circuit’s capability.
Overdrive
Engages/disengages the overdrive section of the PLEX. When Overdrive is active the Level/Drive knob is illuminated blue.

Power

Power supply included
9V DC
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