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DSM Humboldt Electronics Simplifier X Zero Watt Reverb Stereo/Dual Amplifier Pedal

2-channel Stereo Analog Guitar Preamplifier with 6 Amp Voicings, 3 Modes, 3 Reverbs, Cabsim Section, Stereo XLR DI Outputs, Headphone Jack, and Footswitch
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Item ID: SimplifiX
DSM Humboldt Electronics Simplifier X Zero Watt Reverb Stereo/Dual Amplifier Pedal
Price:$469 and 00 cents
Special Financing - Ends Aug 2, 2026. $14/month with 36 month financing*

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DSM Humboldt Electronics Simplifier X Zero Watt Reverb Stereo/Dual Amplifier Pedal
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Price:$469 and 00 cents
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A Pint-sized Powerhouse of All-analog Amplifier Tone

Simple in name but comprehensive in tone, the DSM Humboldt Simplifier X Zero Watt Reverb Stereo/Dual Amplifier pedal raises the Simplifier series to an entirely new level with two fully independent amplifier sections. Both sides of the Simplifier X — Hot-Rod and Classic MK-II — feature three spot-on all-analog re-creations of all-time classic amplifier models for a grand total of six amp voices to twist and tweak with the pedal’s extensive EQ knobs and Pre Type/Pwr Type switches. Three unique modes of operation offer nearly endless cab, amp, and effect switching possibilities, and you also get dual FX send/returns to integrate your stompbox collection. Impressed yet? Well, that’s not the half of it: The Simplifier X all-encompassing feature set rounds it all out with a trio of reverb modes, dual XLR DI outputs, 1/4-inch outputs with independent Cabsim Bypass, an aux input, and a headphone jack for silent practice. It all adds up to a pint-sized powerhouse of all-analog amplifier tone, ready to go head-to-head with even the most feature-laden digital modeler!

Six all-analog amp voices to explore

No matter what sound you’re after, the Simplifier X is happy to oblige with two fully independent all-analog amplifier sections and a grand total of six stunning amplifier voices. Furthermore, the Simplifier X’s mirrored layout is a tone-chaser’s dream setup, including fully independent Resonance knobs, Presence controls, Pre Type/Pwr Type switches, full 3-band EQs, and Cabsim sections.

  • Amp A: This side — dubbed the Hot-Rod — contains three ripping amps on tap, from the classic top-boosted chime of AC Brit TB to the screaming gain tones of MS 800. And, of course, the Hot Rod channel also includes a spot-on re-creation of a modern American tube amp classic in the USA Rod voice, providing you with an exacting tonal tribute to the standby tube amp found on backlines and studios all around the world.
  • Amp B: The Simplifier X’s Classic Mk-II mode collects three amplifier voicings from DSM Humboldt’s previous Simplifier series pedals: AC Brit, USA, and MS Brit. First up, AC Brit re-creates the biting British chime of a 15-watt tube amp classic, while the USA voice goes back to the tweedy beginnings of American amplification with a rough-and-ready roar. Lastly, Sweetwater guitarists find the MS Brit voice to be an immaculate sonic tribute to the high-octane amp head that fueled the classic rock era’s most iconic crunch tones.

Three distinct modes of operation

Once you’ve chosen your amps and dialed in your EQ settings, the DSM Humboldt Simplifier X offers three unique modes of operation to explore:

  • A/B Amp + A/B Cab: The Simplifier X starts with a standard dual mono mode, where you swap between your two amp/cab combos with the click of a switch. This setting is perfect for players who need to instantly swap between different tones, with each amp sporting its own preamp, power amp, cab, reverb level, and loop effects.
  • A/B Amp + Stereo Cab: While this mode also switches between two amp voices, your cabinets and FX loop remain the same on the Left and Right stereo outputs. This allows you to dial in unique cab and effect settings on each side, resulting in a massive and enveloping wash of lush stereo sound.
  • Full Parallel: Finally, Parallel mode pulls out all the stops, allowing you to run both of the Simplifier X’s amplifier voices simultaneously, with each amp routing through the Left and Right outputs. This mode makes full use of the Simplifier X’s completely independent EQ and tone-shaping control sections — it’s essentially the time-tested double-amp stereo guitar rig packed down into a compact stompbox.

A comprehensive rig replacement

This 2-channel pedal has more than a few tricks hidden under the hood, starting off with a lush full-stereo reverb with Room, Plate, and Ether settings to impart a sense of space and size to your sound. Next, a selectable 1/8-inch aux input and headphone jack allow for dead-quiet late-night practice sessions, and you can even send your aux signal straight into the PA at a gig using the Simplifier X’s dual XLR DI outputs. Factor in the output-specific Cabsim Bypass controls and the included 2-button footswitch with channel switching/reverb buttons, and it’s clear that DSM Humboldt intended the Simplifier X to serve as a truly comprehensive centerpiece to your 6-string rig.

DSM Humboldt Zero Watt Reverb Stereo/Dual Amplifier Pedal Features:

  • All-analog 2-channel amplifier simulator pedal, elevating DSM Humboldt’s revered Simplifier series to an entirely new level
  • True stereo operation, with 2 independent stereo inputs
  • Contains 2 unique sides (Hot-Rod and Classic Mk-II), each with a trio of unique voices based on all-time classic amplifier models
  • 3 modes allow you to pair the pedal’s two Amp/Cab sides in a variety of different configurations
  • Independent Pre Type and Pwr Type switches on each side, with Power Drive and Preamp Gain knobs to explore a nearly endless array of amplifier possibilities
  • Fully independent EQ controls for each side, including 3-band EQs, Resonance, and Presence settings to tweak your tone
  • Onboard reverb section to add space and dimension to your tone, including Room, Ether, and Plate settings
  • FX loop with A/B Send and A/B return 1/4-inch jacks
  • Powerful Cabsim section with Combo/Twin/Stack switch and Speaker Color knob
  • Stereo 1/4-inch outputs with independent Cabsim Bypass switches, in addition to stereo XLR DI outs with a ground lift switch
  • Headphone jack with headphone level knob for silent practice sections
  • Assignable Aux In section with Aux Select control
  • Included footswitch for effortless hands-free switching between channels and reverb
  • Robust anodized aluminum enclosure with a handsome sandblasted finish

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Tech Specs

  • Pedal Type: Modeling Preamp
  • Analog/Digital: Analog
  • Channels: 2 (Amp A, Amp B)
  • Form Factor: Pedal
  • EQ: 2 x Bass, 2 x Mid, 2 x Treble, 2 x Presence
  • Amp Modeling: 6 x Amps, 6 x Cabs
  • Effects: 3 x Reverb
  • Inputs: 2 x 1/4" (input A, B), 1 x 1/8" (aux in)
  • Outputs: 2 x XLR (DI out L, R), 2 x 1/4" (Out L, R), 1 x 1/4" (thru)
  • Effects Loop: 2 x 1/4" (send), 2 x 1/4" (return)
  • Other I/O: 1 x 1/8" (footswitch)
  • Headphones: 1 x 1/8"
  • Power Source: 9-12V DC power supply (sold separately)
  • Power Usage: 200mA
  • Height: 2.5"
  • Width: 5.2"
  • Depth: 3.9"
  • Weight: 1 lbs.
  • Manufacturer Part Number: DSM - X

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Reviews

Ambitious and Successful -- Outstanding!
Imagine you had three different amplifiers, each with separate heads/speaker cabs. Now imagine you combine those three preamp circuts, three power amps, and three speaker cabs in any combination. Complicated, right?

Yet Simpifier X is pretty intuitive to learn, if you understand how amplifiers work. (If not, be prepared to learn about gain staging, pre- and power amps, and speaker types.) It's an ambitious tool, with a wide range of possible combinations. Exploring the possibilities could take a lot of time, but that's mostly optional. I decided the middle amp (the Fender-ish one) was home, since I've always played Fender amps, and explore from there, a little bit at a time. You don't have to master the whole thing to use it effectively.

The quality of amp-simulations is excellent, and very touch-responsive--and I love having no screen to navigate. Output routing is flexible and build quality is overall excellent.

There's an additional stereo input, so you can route another sound source--like a piezo bridge pickup--separately if you wish (so you don't have to dedicate one of the two channels to it--I prefer to reserve both channels for the magnetic pickups, so I can switch between or layer them together, and send the piezo to the aux input.

Notice we're using the word "amplifier" in two different ways: Simplifier X combines the three available amplifier simulations into two channels: "Amp A-Classic" and "Amp B-Hot-Rod." So the interface encourages us to think of Simplifier X as two amplifiers, each using the same three preamps and power amps (similar to Marshall, Fender, and Vox), plus three different speaker cabs.

I like to have the knobs within easy reach--it doesn't work so well to put Simplifier X on a pedalboard, where you have to dive to the floor every time you want to tweak something. My solution: a separate metal shelf that attaches to a mic stand, big enough for Simplifier X plus one or two other pedals I need to reach. The rest go on the pedalboard (I haven't outgrown the small-size board)!

Perhaps what's most new here is offering a wide variety of good simulations in a small, analog form. For those (like me) who aren't interested in menu diving, sampling or digital editing, this opens new possibilities. For those who prefer digital, this is still one way to get a lot of good sounds in a small, flexible package.
Music background: Music professor, author, composer/performer
It really is something different
I have owned many of the popular amp modelers (Fractal, Helix, Tonex) as well as the Synergy system. This pedal is quite special. I think it feels better than software, and is easier to dial in and (IMO) sounds as good or better than the Synergy modules doing similar tones (I mention them because they are also analog). This pedal is going to replace the amp tones from my Helix for live use while decreasing the size of my travel rig. The onboard reverb sounds perfectly fine and I think they did a good job of selecting the most useful variants. Overall I am extremely pleased and can highly recommend this if you are looking for a small rig that nails the feel of an amp with great tones and flexible I/O to boot. 5 stars.
Music background: multi instrumentalist, singer, studio owner
It Won Me Over
I absolutely love this unit. I have loads of gear and super nice amps but the ease-of-use and flexibility of this is pretty hard to beat. With more people wanting a silent stage, I knew I would have to at least have the option to run something like a modeler. I tried the helix and it was good but took a lot of dialing in. Running this on my pedalboard gave me tones and feel that were closer to the real thing. I'm using this every week now.
One of the best modelers - even compared to the big boys (i.e., digital)
I have too much gear. I begin my review with that statement because it is from that reference point that I feel I can appropriately comment about the quality and versatility of the Simplifier X. I have owned the two prior iterations of the simplifier. I owned the dlx model for a brief time but did not gel with it (primarily because of the cab sim tones) and then I owned mkii almost immediately after it was released until I purchased the X model. The X version is an enhanced version of the mkii. The biggest improvements in the mkii and x c/w with the prior versions are superior analog cab sims and realistic power amp distortion. I find myself reaching for the simplifier X more often than my fractal fm9 and my quad cortex when I just want to lay down a quality guitar track. Obviously the digital modelers have the simplifier X beat in terms of variety of amp tones and they both have tons of extra effects —- but if we are just talking about the raw guitar tone - I personally achieve a faster and more pleasing tone from the simplifier X. My main tones are a hard rock crunch using the 800 model, a 70's rock crunch using the mkii plexi side and a clean American tone using the mkii American side with the twin cab. The tones are very present and rich. The simplifier takes pedals very well and feels essentially the same as my tube amps (of which I also have too many). Are there cons? Only one that I have found —- for smaller room/plate reverbs, the reverb is too wet/long unless it is barely on. So I use an eventide H90 to supply verb and delay using the built-in effects loop. On the flip side for ambient or washy tones the verb would be fine - but again I am often going for very present, in-your-face rock tones that use just a touch of room verb for more realistic recordings.
Even better than how great the last version DLX was!!
I absolutely LOVE it! I loved the version before, which I had before the upgrade. I own a 5 real amps that I use regularly through an Oxbox into it's and/or third party speaker emulation. I also have an Axe-Fx III.

I have really found that it just takes pedals SO well and has a BRILLIANT speaker emulation. The whole thing feels more immediate to me.

Currently using the AC-30 channel clean with a Revival Drive, Bogner LaGrange,DBA Rooms close to the beginning of the chain. Pog. 29 Pedals Euna at the beginning, and a Wren Caprid at the end, all through a DL$ MK2 and a Deco into a Chandler TG2....at the moment.

Funny because I haven't really loved playing through AC-30's before. Have always been more of a Bassman/early Marshal person. Had hugely loved the tones that other players had gotten out of them on record, yet the few I played were kinda stiff and not overdriving with pedals I had and it was always friends that loved the Beatles and probably had an earlier circuit...I was still working on finding a sound I loved through old Bassmans in stereo.

I love experimenting with pedals so much. It takes pedals so well, always had issues trying to overdrive the front end of the Axe...just doesn't tolerate it. Found the Kemper to be slightly better at it, yet nothing is as fantastic as this, other than my real amps...and I can take it downstairs out of my studio and plug it into my 1010 Bluebox and it just FEELS real to me out through monitors or headphones...much closer to the feeling of having an amp in the room than the Axe ever has.

Then again, I now 99% of the time in my studio use virtual cabs as my neighbors would be up in arms if I plugged in my various small cabs .Even 2 1x12 Greenbacks in their own cabinets in stereo can be so loud it could destroy your hearing.

So, if you have a studio and mic'ed cabs going...yeah it's not the ultimate sound.

Yet it is to me the most jaw dropping easy to use, portable, and most importantly inspirational amp in a box that I've ever encountered.

How's that for hyperbole:-)

I promise I don't know or am affiliated with the company in any way. I bought the last version and sold it to get the newer version.

Am a bit stoned though
Music background: Sonic Explorer