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DSM Humboldt Electronics Simplifier DLX Zero Watt Dual Channel & Reverb Stereo Amplifier

2-ch Analog Guitar Preamp with 3 Amp Voicings, Power Amp Sim, Cab Sim, Reverb, Stereo Balanced XLR Outputs, 1/8" Aux Input, 1/8" Headphone Output, and Footswitch
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DSM Humboldt Electronics Simplifier DLX Zero Watt Dual Channel & Reverb Stereo Amplifier
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Like Having Two Independent Stereo Amps at Your Feet

The DSM & Humboldt Simplifier DLX is the natural progression of the original Simplifier — many weekend and worship guitarists’ favorite “zero-watt” analog amplifier. This pedalboard-sized stereo analog preamp and cab sim is every bit as versatile as having two fully independent amps at your feet. Dual independent signal paths allow you to meticulously dial in clean and dirt channels or, alternatively, run two wildly different tones in parallel to create elaborate wet/dry direct rigs. As with the original, each channel of the Simplifier DLX is driven by a triad of essential amp British and American amp tones. Only now, a 3-way Mode switch (Clean/Crunch/Lead) allows you to really slather on the saturation or dial up the dynamics in a hurry. Cab simulation and a new 3-way reverb can be dialed in per amp path, as can the Simplifier DLX’s simulated power tube emulation and critical feedback-based Resonance and Presence controls. Just like the original Simplifier, the Simplifier DLX makes a supreme pedal platform — its balanced TRS mono/stereo input stage and stereo FX return bring your boutique overdrives, stereo delays, and reverbs to life. Factor in a dedicated headphone out and aux in for live monitoring, an FX pass-through for handing off stereo effects to a pair of stage amps, low-noise stereo balanced XLR outs for sending signal to FOH, and a Spread switch that lets you achieve wide faux-stereo effects from mono guitar signals, and the DSM & Humboldt Simplifier DLX pedalboard preamplifier is a top-tier option for traditional players as well as those seeking to leave the amp at home.

Worlds collide: the Simplifier DLX

The DSM & Humboldt Simplifier DLX is the brainchild of Manuel Jano Acevedo of Humboldt Electronics and Daniel Schwartz of DSM Noisemaker. The concept of the Simplifier line arose when both players knew they wanted to address their own gigging needs in a single fly-ready pedalboard solution. “Manuel is a worship player, so parallel amps with very nice cleans, with ‘bite’ and dynamics, were a must,” says Daniel. “I, on the other hand, am a heavier player, and I like 2-channel amps (for Rhythm and Lead) with stereo FX on the loop. So the Simplifier DLX really had to do it all.” And does it ever do it all. Here at Sweetwater, we feel the Simplifier DLX really expands on the original Simplifier’s sound and utility, with parallel signal paths, channel switching, and fully stereo signal chain.

The freedom to leave your amp and cab behind

Gigging Sweetwater guitarists require guitar amps that are great for accepting pedals, monitoring from the stage, and miking up for FOH reinforcement. The DSM & Humboldt Simplifier DLX brings these key functions to pedalboard-sized preamplifier that’s ready for prime time — no soundcheck required. Now you have the freedom to leave your amp and cab behind. The Simplifier DLX’s stereo balanced XLR outputs allow you to send a signal straight to a soundboard or stereo FRFR setup. Meanwhile, an onboard headphone amp lets you monitor yourself directly from your station to dramatically reduce stage bleed and increase isolation. All told, the DSM & Humboldt Simplifier DLX is a great way to save wear and tear on your amps, back, and ears.

Takes stereo pedals like a champ

The DSM & Humboldt Simplifier DLX makes a supreme stereo pedal platform. In fact, it’s by incorporating your pedals that this preamp really comes to life. A stereo FX return allows you to position your digital reverbs and ping-pong delays after the preamp and “power amp” stages to prevent and loss of signal or fidelity. Feed drive and compressor stomps directly into the input, and you’ve got a premium front end for serving up everything from Nashville cleans to blistering leads.

Three essential amp voicings per channel

The Simplifier DLX’s twin analog preamps mimic the sound and handling of three essential amp voicings. Gain structure and midrange contour are unique to each voicing contained within. Two independent channels, each with their own 3-band EQ and Clean/Crunch/Lead switch, let you run wildly different tones in parallel or switch between them using the included two-button footswitch.

  • AC Brit: A sweet, sparkling voicing based on a British icon known for its twinkling cleans and emotive verge-of-breakup grind.
  • American: Supplies the quacky midrange and chunky bass of black-panel Deluxe. Sweet when clean; roars when pushed.
  • MS Brit: Packs on the glassy gain and forward character of a Plexiglas-paneled vintage amp stack.

Analog power amp sim

The interaction between power tubes and output transformer plays a big part in the stiffness, compression, and saturation characteristics of our favorite amps. The Simplifier DLX brings you a 3-way tube toggle (6L6/EL34/KT88) and those essential feedback- and series-based Presence and Resonance controls to emulate the power amp stage of a driven tube amp.

Multi-stage stereo reverb

Independent reverb sends per channel on the Simplifier DLX means you don’t have to sacrifice definition in your crunch tones when building ambient cleans and sultry soaks. Room, Plate, and Ether reverb styles supply a generous range of tones to choose from, even without any other pedals in tow.

Stereo analog cab sim

The Simplifier DLX also gives you channel-independent analog cab sims for running signals straight out to a soundboard. Cycle between Combo, Twin, or Stack cab options per channel, then adjust the directivity of each virtual mic and speaker using the Mic Position knob — clockwise for brighter and more direct tones, counterclockwise for woolier and more off-axis sounds.

Stereo direct amp pass-through

Let’s say you want to run direct to the soundboard but still monitor yourself through cabs. Or, maybe you just want to monitor from your pedalboard and mic up cabs from the stage. The DSM & Humboldt Simplifier DLX is able to pass your stereo effects pedals directly onto your powered stage amps to provide a rich, stereo spread.

Pseudo-stereo Spread switch

Want to widen your appeal? The Simplifier DLX’s Spread switch converts incoming mono signals into pseudo-stereo to send you a faux double-tracked sound into your headphones and PA.

Headphone out and auxiliary input

Thanks to its powerful 135mW stereo headphone amplifier, the Simplifier DLX is a key ingredient in creating a silent stage. Practicing along to jam tracks? Monitoring MultiTracks in your in-ears? The Simplifier DLX’s auxiliary input lets you live monitor songs from your music library and audio from your DAW while you play, saving the need for a dedicated in-ear system.

DSM & Humboldt Simplifier DLX Zero-Watt Stereo Amplifier Features:

  • Pedalboard-sized analog preamplifier with onboard power amp sim and cab sim
  • Gives you 2 full independent stereo channels
  • Great for rhythm-lead duties or creating elaborate wet/dry direct sends
  • Totally analog signal path — no latency, no aliasing
  • Perfect for fly dates, commutes, and Sunday mornings — no amp or cab required
  • An ideal pack-in pedal platform
  • A key ingredient in creating a silent stage
  • Stereo balanced XLR outputs allow you to send a signal straight to a soundboard or stereo FRFR setup
  • Powerful 135mW headphone amp lets you monitor directly from your pedalboard
  • Auxiliary input for live monitoring jam tracks and MultiTracks
  • 3 onboard analog amp voicings (AC Brit, American, MS Brit) per channel — each with unique gain and midrange characteristics
  • 3-way Mode switch helps you slather on the saturation or dial up the dynamics in a hurry
  • Analog power amp sim section 3 tube types (6L6, EL34, KT88) and Resonance/Presence controls captures the stiffness, compression, and saturation of your favorite tube amps
  • Stereo analog cab sim with 3 assignable cab emulations (Combo, Twin, Stack) and directivity controls per side
  • Stereo amp pass-through lets you monitor FX pedals through stage amps
  • Spread switch converts mono signals to pseudo-stereo for inspiring faux double-tracked effects
  • 2-button footswitch included

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Tech Specs

  • Pedal Type: Modeling Preamp
  • Analog/Digital: Analog
  • Channels: 2 (Normal, Pushed)
  • Form Factor: Pedal
  • EQ: 2 x 3-band EQ, Resonance, Presence
  • Amp Modeling: 3 x Amps, 3 x Cabinets, 3 x Power Tube
  • Effects: 3 x Reverb
  • Inputs: 2 x 1/4" TRS (instrument: mono/stereo), 1 x 1/8" (aux)
  • Outputs: 2 x 1/4" TS (L, R), 2 x XLR (direct out), 1 x 1/4" TRS (thru)
  • Effects Loop: 1 x 1/4" TRS (send), 2 x 1/4" (Return: L/R)
  • Other I/O: 1 x 1/8" (footswitch)
  • Headphones: 1 x 1/8"
  • Power Source: 9V-12V DC power supply (sold separately)
  • Power Usage: 150mA
  • Height: 2.5"
  • Width: 5.1"
  • Depth: 3.9"
  • Weight: 0.95 lbs.
  • Manufacturer Part Number: DSM-DLXSIM

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Customer Reviews

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Rated 5/5

Best Amp Pedal available!

I am a worship guitarist, so naturally I was drawn to Strymon products. The Iridium is great, but when I plugged in the the Simplifier DLX, I entered a whole new realm of sonic bliss! The all analog circuitry makes an immediate difference in the "feel" under the fingers. I didn't really realize what people meant when they said things sound digital, but after hearing this thing, I absolutely get the obsession with analog pedals/amps. I'm honestly disappointed with DSM Humboldt for not putting more money into marketing, because they have an incredible product in the Simplifier DLX. Also, the reverb on this unit is absolutely perfect! I no longer need a reverb pedal as the reverb is extremely useful. My only gripe might be that you can't switch between reverb types using the footswitch, but it's only minor when considering how good this pedal is. Another feature I really enjoy is the "Aux In" line. I just plug in my bluetooth transmitter and can practice along with any music I want. This is an absolute must-try amp pedal if you are in the market.
Music background: Worship Guitarist
Rated 5/5

A Massively Overlooked ‘Amp-In-A-Box’ Option

In my opinion what DSM are doing is nothing short of incredible. The fact they opt for an 'all analogue' approach rather than the common IR one is to me the key as to why their devices sound so good. They just have a sonic integrity that sounds both natural and hard to beat. I found when using the DLX with its two-channels, it was possible to utilise this pedal much in the same way I would a two-channel amp. Therefore opening up options like using it in a 'low-gain / high gain' capacity. I personally use it this way with the addition of a an extra boost pedal on the high gain channel. Obviously one can choose to taste whether it's an OD or DIS you use with it. I have tried and still own a few other options like the UA, Two Notes, Tonex, Fender TMP, Quad Cortex etc. I find this to be the most tactile and sonically pleasing of all.

Thanks.
Music background: Recording Artist
Rated 5/5

Great sound for live sound silent stage use

My band has gone to a silent stage situation in 2023 and moving forward. We used in ear monitors already. I tried various direct options. All had two problems. Either they were close but not close enough to my normal tube amp and pedal board mic'd sound, or they were very hard to program for a knuckle dragging caveman guitar player like myself. My long time Sweetwater rep, Bob Furlong, said many guitar players he talked to really liked the Simplifier Deluxe. Now I remembered Don Carr's video when this came out and remember the sounds seemed legit, but it was an internet video. I indicated a good Fender clean and Marshall overdrive sound is all I needed and the Vox sound would be a nice bonus. I longed to twist knobs and flip switches to get a fast workflow sans menus. I plugged this thing in after the family was asleep and could not stop and played for hours. In minutes I had to my ears fantastic sounds and most importantly they felt real. This same feel connection was missing in many higher end modeler's and profiler's I tried and many other units. Then I messed with the Vox sounds and all the other mic placement options and again found fantastic tones. I'm now getting good at "on the fly" knob/switches changes before a tune I need a specific sound for. Normally the two sounds- American and British are all I need. It is all in there and easy to use. An HX effects is in the effects loop with a few overdrives and wah run before the input (just like a real tube amp.) It sounds so good with all these pedals, just like an amp. The analog difference they discuss on numerous videos on the internet is a real thing. Thanks Bob for this recommendation. It stopped my search for an easy to use silent stage solution.
Music background: Band musician for decades
Rated 5/5

I'm speechless about the Simplifier DLX

I got the Simplifier DLX about two months ago and, I've been using it as my toy to go during my last 2 shows.
The sound quality, features and FX-loop capability in a tiny box are out of the world.
A quick shout to my Sweetwater rep. Jordan G. He is amazing and helped me out to get the Simplifier DLX on a timely manner.
Rated 5/5

Amazing

I feel like I am constantly chasing the best guitar tone while saving my back.

In the Simplifier DLX, I think I have found it. I am having so much fun just playing.. no menu diving or button tweaking.. turn a couple knobs and go.
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