Gallien-Krueger PLEX Preamp - 4 Band Active Preamp Pedal

Bass Guitar Preamp Pedal with 4-band EQ, Voicing Filters, Compressor, Chromatic Tuner, Boost, Aux Input, Phones Output, XLR Output, Ground Lift, Pre/Post Selector, Effects Loop, and USB Connectivity
Gallien-Krueger PLEX Preamp - 4 Band Active Preamp Pedal image 1
Gallien-Krueger PLEX Preamp - 4 Band Active Preamp Pedal image 1
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Gallien-Krueger PLEX Preamp - 4 Band Active Preamp Pedal
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Feature-packed Bass Preamp in a Pedal

The Gallien-Krueger PLEX Preamp bass guitar pedal delivers an incredible arsenal of tools. A 4-band active EQ yields endless sound-shaping opportunities. The PLEX's Contour control will make fans of the legendary 800RB bass head feel right at home. Smooth out your sound using the PLEX's built-in compressor. Maintain your intonation with the PLEX's chromatic tuner. Make your weak bass signal pop with the PLEX's boost function. A direct XLR out lets you plug straight into a console or PA. One of our favorite uses for the Gallien-Krueger PLEX Preamp bass guitar pedal here at Sweetwater is as a re-amping device via its USB in/out.

Gallien-Krueger PLEX Preamp Bass Guitar Pedal Features at a Glance:
  • 4-band active EQ and Contour control for sound shaping
  • Selectable voicing filters expand your tonal palate
  • Compressor with variable ratio, threshold, and attack/release
  • Chromatic tuner with large, easy-to-see LED display
  • Boost with variable clipping and level switch for improving weak signals
  • Aux input and phones output for jamming along with recordings and private practice
  • XLR output with ground lift and pre/post selector for DI-ing your bass
  • USB in/out for MIDI, direct recording, and re-amping
  • Effects send and return for integrating your other processors
The Gallien-Krueger PLEX Preamp bass guitar pedal is jam-packed with cool features!

Additional Media

Gallien-Krueger PLEX 4-band Active Preamp Pedal Demo

Tech Specs

Type Bass Preamp/Tuner/Interface
Form Factor Pedal
Inputs 1 x 1/4" (instrument), 1 x 1/4" (return), 1 x 1/8" (aux in)
Outputs 1 x 1/4" (out), 1 x 1/4" (send), 1 x 1/8" (headphones), 1 x XLR (direct out)
Computer Connectivity USB Micro-B (recording, MIDI In/Out)
Height 1.4"
Width 5.3"
Depth 5.6"
Weight 1.5 lbs.
Manufacturer Part Number 302-0870-A

Customer Reviews

Based on 8 reviews
Write your review


I love this thing! Compressor, tuner, pre amp, distortion, amp selection, DI, recording interface.... does almost everything! Love the send/receive jacks also. DI works good also. Playing bass for 18 years, wish i had this before.

Great pre-amp and great service

My pre amp did not work when it arrived. SW gave me an advanced replacement that arrived the next day. So great service first of all. I love the DI feature and the compression and overdrive sound great. The extra control in the click features of the dials are fun to experiment with. I am still dialing in the sounds I like. It is an excellent tool!
Music background: Church/Hobby

GK Plex

If you are in the market for a preamp this will fit the bill perfectly! Another great product from GK.

Great tones and features!

I bought this unit for the combination of features, DI/GK voicing/boost/comp/tuner, for mainly live use. After fiddling for some time I was able to dial in some very usable tones through the headphone out which surprisingly translated very well live through FOH. In my opinion it does a great 800rb tone through the DI without having to mic a cab. The boost works very well in conjunction with the compressor but does take some tweaking. All-in-all this is a solid built unit with great sounding authentic GK tones and packed with usable features. Money WELL spent.

Versatile preamp

I waited for the re-released version so no noise, and I could get any sound out of it I needed.
Music background: Bass Player, Producer
See also: Bass Effects, Gallien-Krueger, Gallien-Krueger Bass Guitar Pedals & Effects