EAE StompMix X4-2 PRO Battery Powered Mixer Pedal

EAE StompMix X4-2 PRO Battery Powered Mixer Pedal

Four Channels Battery Powered digital Mixer Pedal

StompMIX X4-2 PRO - Four channels Compact Digital Mixer Pedal with Rechargable Battery

The StompMix X4-2 PRO Battery Powered Mixer Pedal is built with a powerful 32-bit 100Mhz DSP engine and a compact lightweight Aluminum stomp box package.  The StompMix X4-2 PRO offers a full featured, highly intuitive four channels Digital Mixer with a Color Display.  The DSP engine provides a compressor, Mid sweepable EQ, Highpass Filter, Notch Filter, Phase reverse to each of the 4 inputs. Analog inputs consisted of 2 Class A solid-state Mic pre-amps with +48V Phantom power and two 1/4″ TS line inputs.  Two sets of stereo Mix outputs are selectable between a XLR jack and 2 1/4″ TS jacks .  1/8″ AUX input and Headphone outputs, 2 Footswitches with assignable functions. Built-in rechargeable battery.


“ The StompMix 4 is a Game Changer for Acoustic Guitarists using multi-sourcepickup systems. It’s a feature rich mixer pedal that fits in your hand ”


Don Alder - Multi-Award Guitarist

“The mixer that I had been looking for so many years. It has exactly what I love about a good stomp pedal: It’s user-friendly and it has a great sound.”

“La consola de piso que estuve buscando por muchos años. Tiene todo que lo que me encanta que tenga un buen pedal de efectos: es fácil de programar y tiene un gran sonido.”


Daniel Fraire

StompMix X4 -2 PRO Battery Powered Four Channel Digital Pedalboard Mixer Features

  • 4-Channel Battery Powered Digital Mixer Pedal
  • 10 user scene memories.
  • Color display
  • Input Level Monitoring
  • 2 Class-A selectable Mic/Line/INSTR inputs with TRIM and PAD (CHAN 1 and 2)
  • 2 LINE inputs (CHAN 3 and 4)
  • +48V Phantom Power
  • Independent Reverb effect on each channel
  • 2 notch filter available on each channel
  • High Pass Filter and Phase Reverse on each channel
  • Noise Gate and Compressor on each channel
  • 3 Band EQ with Sweepable MID on each channel
  • Max 1 second Delay with Tap Tempo (assign to one Channel at a time)
  • Assignable Footswitch functions (MUTE channels, EFX by-pass, Tap Tempo, Scene change etc)
  • Output 1 – (2 Balance XLR outputs)
  • Output 2 (Stereo TRS 1/4″ jack)
  • Headpone Output (1/8″ stereo jack)
  • Aux Input (1/8″ stereo input jack)
  • Main MIX and AUX MIX
  • Built-in Rechargeable battery – up to 8 hours playtime on a full charge.
  • Scenes Change  – via Footswitches.
  • Aluminum Metal chassis
  • AC/DC power supply included
  • 12VDC Power Adaptor (2000mA 2.1mm *Center Positive*)
  • Designed and assembled in USA
  • Dimensions: 4.3/4”W x 5 1/2”D x 4”H
  • Weight: 2.8 lbs

Shimmer Reverb and Delay setting (multiple-pickups) – short clip below

StompMix 4 PRO Pedalboard Mixer Videos

Save/Recall Scenes – short clip below

This video shows how to Save and Recall Scene. There are 2 ways to recall scenes on the StompMix 4. Using the A or B footswitches or using the Recall Button.

If using A or B to recall scenes, the A and B footswitches must be assigned to M+ M- (page 12 of the user manual)

When using the Recall Button – ONLY a quick press is needed, DO NOT hold the encoder button.

“The StompMix 4 is a game changer for anyone using multiple pickups in a single guitar. The StompMix allows me to run up to 4 separate signals into it and have full control over the volume/effects/EQ of each input, ideal for on-the-fly adjustments when playing on stage.”

Sean de Burca – UK Guitarist

Sean de Burca

StompMix X4-2 Pro Pedalboard Mixer Frequent Questions and more


  • 1) Can +9VDC be used to power the StompMix X4-2 PRO?
  • – No, +12V is needed for Charging battery.
  • 2) Can I plug Passive Pickups directly into the StompMix X4-2 PRO?
  • – Yes, most K&K passive pickup systems work with the StompMix X4-2 PRO,  2 High-Z Instrument Inputs are available on the StompMix X4-2 PRO.
  • 3)  Too Much Hiss on the outputs?
  • – Make sure the GAIN level knobs for Chan 1 and Chan 2 are NOT at MAX.
  • – Reduce the MIX input level to be about 12 o’clock for each channel.
  • – Check for possible Ground Loops
  • 4) Can Delay be used on all channels at the same time?
  • – No, Delay can only be used one channel at a time. It is assignable.
  • 5) Can Chan 3 and 4 be used for Guitar with Passive Pickup?
  • – Yes. Most K&K passive Pickup systems will work.
  • *** CHAN 3 and CHAN 4 (TS jacks) *** we don’t recommend these inputs to be used with very low output Passive Pickups. Use Chan 1 and Chan 2 Instrument inputs for very low output Passive Pickups.
  • 6) Should I use MONO cable or Stereo Cable for the 1/4″ outputs?
  • Output 2 – can use MONO or Stereo Cables. Output 1 uses XLR cables.
  • 7) How do I set the EQ on each channel?
  • – click the Encoder Knob to access the EQ settings.
  • 8) Does StompMix X4-2 PRO support Tap Tempo?
  • – Yes.
  • 9) Digital noise on outputs
  • – Check for possible Ground Loops.
  • 10) Is Headphone output (1/8″ jack) Stereo?
  • – Yes, it is a TRS jack, Tip is Aux Left and Ring is Aux Right.
  • 11) Not getting scenes changes with M+ M- footswitches. 
  • – Check and make sure 2 or more Scenes are saved.
  •  12) Recall Button on Memories page not working. 
  • – A Quick Press (or Tap) is required, DO NOT hold the encoder button.
  • 13) Can EFX be muted on all channels with one footswitch press. 
  • – yes, A/B footswitches needs to be assigned to “1-4 EFX”.   (Footswitch A will Mute all 4 channels and B will bypass EFX) – page 12 of user manual.
  • 14) Can StompMix X4-2 PRO be used while charging
    – Yes. Unit will operate normally while charging.
  • 15) 
  • 16) Can the Main Mix MONO and Aux Mix MONO be sent out via XLR jacks or the 1/4″ TRS jack?
  • – Assign out1 or out2 with “M< >A”, MAIN Mix MONO is sent to XLR LEFT output and AUX mix MONO is sent to XLR RIGHT output.
  • 17) AUX Mix doesn’t have Reverb.
  • – That is correct, only “MAIN mix” have Reverb added. There is no option to add Reverb to the “Aux Mix”.
  • 18) Can I get Reverb to Output 2 (1/4″ TRS jack)
  • – yes, “Main Mix” can be assigned to Output 2.
  • 19) AUX Mix level is linked to “Main Mix” level. 
  • – “Aux Mix” level can be assigned “Pre” or “Post” the “Main Mix” level. to make it independent, change setting to “Pre”


The StompMix X4-2 PRO utilizes the same Lithium Iron Phosphate (LFP) batteries and protection/charging circuits as A6-55 since 2018.  LFP batteries are “NOT” the same type as Lithium Ion (Li+) or Lithium Polymer Batteries (LiPO or Li-Poly).  We selected Lithium Iron Phosphate (LFP) type of batteries for it’s advantages in safety properties and long service life. LFP is thermally and chemically stable, reliable without the possibility of lithium fires. LFP batteries have long service life, with a shelf life that far exceeds the service life of many other batteries.  Not only we enclosed the Batteries in a metal cage, we added many Battery Protection circuits – Over Voltage protection, Thermal Shutdown, Over Charge protection, Over Drain protection. The LFP batteries are used in our products are UL safety approved and MSDS certified.

StompMix X4-2 PRO - V1.03 user manualStompMix X4-2 PRO - Block Diagram

High Resolution Pictures:

StompMix X4-2 PRO - Top ViewStompMix X4-2 PRO - Rear ViewStompMix X4-2 PRO - Side ViewStompMix X4-2 PRO - Rear ISO ViewStompMix X4-2 PRO - Front ISO View