AudioFu Chart · November 2026
Best Expander Modules Under $300 2026
The top pick is 4MS QCD Expander ($111). Intellijel Designs XY IO 1U gives you the most for the money at $23. Xaoc Devices Hrad Mixing Console Expansion leads the high end. Ranked by the AudioFu Index from 64 models across 21 brands, prices checked every night.
Last updated: November 4, 2026
Top 10
Full detail for the 10 highest AudioFu Index scores. Every other model is listed below.
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You get this module if you already own a 4ms Meta Module and want to move patches and presets to and from your computer without cables. It is a small 4 HP unit that fits a Eurorack case, and it runs on a 12 V supply with a modest current draw. It makes the most sense for Meta Module owners who want easier file sharing.
Pros
- Connects to a computer over Wi-Fi for easy exchange of patches and presets
- Uses 2.4 GHz 802.11 b/g/n Wi-Fi, so setup needs no cables
- Extends the 4ms Meta Module, adding wireless patch management
Cons
- Works only with the 4ms Meta Module, so it has no use with other gear
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Expert Sleepers ESX-8CV MK2 CV Expander Eurorack Synth Module
ESX-8CV mk2 · Expert Sleepers
8 for sale on Reverb1 finish at Thomann
If you already use an ES-4, ES-40 or ES-5 and want more control voltage outputs, this module is built for that job. It gives you eight CV outputs on 3.5 mm mini jacks, and a jumper lets you choose between calibrated and uncalibrated voltage ranges. It is a small 4 HP module that draws little power, so it can fit into a Eurorack setup.
Pros
- Adds eight CV outputs through 3.5 mm mini jacks
- DC coupled outputs for direct control voltage use
- Jumper lets you pick calibrated ±5.33V or uncalibrated ±9.5V output
Cons
- Works only as an extension for the ES-4, ES-40 or ES-5 module
- Needs ±12 V power from your Eurorack case
75AudioFu
IndexStableno change since Aug 17Aug 17$211 now$211€189 at Thomann · in stockCheck price ↗ -
The NIN is an extension module for the Zadar by XAOC, so you only need it if you already own a Zadar or plan to buy one. It adds manual trigger buttons and an extra assignable CV input for channels A-D, which gives you more hands-on control. At 3 HP, it fits into a small Eurorack case without taking up much room.
Pros
- Adds manual trigger buttons for channels A-D on the Zadar
- Gives channels A-D an additional assignable CV input
- Only 3 HP wide, so it saves space in a Eurorack case
Cons
- Needs the Zadar by XAOC (Article Nr #447263#), which is not included
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Expert Sleepers FHX-8CV CV Expander Eurorack Synth Module
FHX-8GT · Expert Sleepers
4 for sale on Reverb2 finishes at Thomann
If you already own an FH-2 and want more outputs for triggers, clocks and gates, this module is for you. Each one adds eight programmable outputs, and up to four can connect to a single FH-2. It is narrow and draws little power, so it can fit into many Eurorack setups.
Pros
- Adds eight programmable clock, trigger and gate outputs to the FH-2
- Up to four FHX-8GT modules can connect to one FH-2
- Compact 4 TE Eurorack width fits easily in a small case
Cons
- Needs an FH-2 module to work, which is not included with this product
73AudioFu
IndexStableno change since Aug 17Aug 17$116 now$116€104 at Thomann · in stockCheck price ↗ -
If you already own an A-160 clock divider, this module lets you add an 8-step sequencer to your Eurorack setup. It gives you eight outputs that switch along with the divider's rhythm, and it takes up only 4 HP of rack space. Just remember it has to sit directly to the right of the A-160 to work.
Pros
- Eight outputs switch in time with the A-160 clock divider rhythm
- Designed as an extension module for the A-160 clock divider
- Compact Eurorack format at 4 HP width
Cons
- Must be installed directly to the right of the A-160 clock divider
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The Doepfer A-154 is a sequencer controller for the A-155 module in Eurorack format. You get 8 or 16 steps, several operating modes, and an LED display, and it can control up to two A-155 modules. It suits you if you want to build repeating patterns in a Eurorack setup, but keep in mind that 16 steps need two A-155 modules.
Pros
- Sequencer with 8 or 16 steps for building repeating patterns
- Various operating modes give you different ways to run the sequence
- LED display shows the current state at a glance
Cons
- 16 steps need two A-155 modules, so you need extra hardware for the full range
72AudioFu
IndexStableno change since Aug 17Aug 17$218 now$218€195 at Thomann · in stockCheck price ↗ -
If you already run Intellijel gear, this small module can be a handy add-on. It takes up 4 HP and gives you two 3.5 mm TRS jacks you can use as an insert, a send/return, or a stereo output. It suits you if you want more routing options in a compatible Intellijel case without using much space.
Pros
- Adds a 4 HP module that expands Intellijel Mixup and Pedal I/O 1U setups
- Works with 62 Palette cases and 7U cases with V2 audio jacks board
- Two 3.5 mm TRS jacks give you flexible patching options
Cons
- Only two jacks, so it does not offer many connections for large setups
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Expert Sleepers TMB Tiny MIDI Breakout Eurorack Synth Module
Tiny MIDI Breakout · Expert Sleepers
5 for sale on Reverb1 finish at Thomann
This Tiny MIDI Breakout is a brilliant little addition for Disting and ES-9 users who need simple MIDI routing. It's a no-fuss solution that gets the job done without hogging valuable rack space or drawing power. Perfect for modular enthusiasts wanting a streamlined MIDI workflow without extra complexity.
Pros
- Tiny footprint maximizes precious Eurorack space efficiently.
- Passive design eliminates power draw, simplifying your PSU needs.
- Robust TRS jacks offer reliable MIDI signal transfer consistently.
Cons
- Passive design means it relies entirely on Disting or ES-9 for MIDI processing.
- Limited to Expert Sleepers ecosystem; compatibility is key.
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Expert Sleepers TMB Tiny MIDI Breakout Eurorack Synth Module
MIDI breakout · Expert Sleepers
5 for sale on Reverb1 finish at Thomann
This is a small Eurorack module with one MIDI input and one MIDI output. It connects to compatible modules like the Disting mk4, General CV and FH-2 through their breakout header. If you already use one of those modules and want MIDI in your rack, this is a simple, compact way to add it.
Pros
- Has one MIDI input and one MIDI output for compatible modules
- Connects through a breakout header on compatible modules
- Works with the Disting mk4, General CV and FH-2
Cons
- Only one MIDI input and one MIDI output, so no extra MIDI ports
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Xaoc Devices Hrad Mixing Console Expansion
Hrad · XAOC Devices
4 for sale on Reverb1 finish at Thomann
The Hrad is a focused, essential expander for anyone already invested in the XAOC Praga ecosystem. It streamlines your aux routing and cueing, making complex patching more manageable and performance-ready. If you're building a Praga-centric modular system, this is a smart, efficient addition.
Pros
- Solid build quality; feels robust and well-engineered
- Provides crucial expandability for Praga mixer workflow
- Cue output is thoughtfully implemented for performance use
Cons
- Requires Praga module, adding to overall system cost
- Limited routing flexibility compared to more complex expanders
67AudioFu
IndexStableno change since Aug 17Aug 17$278 now$278€249 at Thomann · in stockCheck price ↗
All 64 expander modules
Same index, same nightly prices — compact. Colour options of one model share a row. Tap a photo to zoom.
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Intellijel Designs AtlxIntellijel Designs · 2 finishes57Stable$73€65$73€65Check ↗
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Erica Synths Black Filter CouplerBlack VCF Coupler · Erica Synths56Stable$111€99$111€99Check ↗
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Schlappi Engineering CascadeSchlappi Engineering · 2 finishes51Stable$73€65$73€65Check ↗
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Der Mann mit der Maschine P10 ControllerDer Mann mit der Maschine51↓ 3.9%$111€99$111€99Check ↗
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XAOC Devices HelXAOC Devices50Stable$95€85$95€85Check ↗
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Befaco MEX Eurorack Synthesizer ModuleMEX · Befaco50Stable$95€85$95€85Check ↗
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XAOC Devices Poti IIXAOC Devices50Stable$99€89$99€89Check ↗
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XAOC Devices AradXAOC Devices50Stable$133€119$133€119Check ↗
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XAOC Devices GeraXAOC Devices50Stable$173€155$173€155Check ↗
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XAOC Devices Lipsk IIXAOC Devices50Stable$173€155$173€155Check ↗
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XAOC Devices Ostankino IIXAOC Devices50Stable$188€168$188€168Check ↗
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XAOC Devices DevaXAOC Devices50Stable$196€175$196€175Check ↗
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XAOC Devices JenaXAOC Devices50Stable$278€249$278€249Check ↗
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XAOC Devices BohuminXAOC Devices50Stable$278€249$278€249Check ↗
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XAOC Devices RostockXAOC Devices50Stable$278€249$278€249Check ↗
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XAOC Devices UstkaXAOC Devices49↑ 1.6%$73€65$73€65Check ↗
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Der Mann mit der Maschine S10 ControllerDer Mann mit der Maschine49↓ 0.7%$154€138$154€138Check ↗
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Intellijel Designs Stereo Line In Jacks 1UIntellijel Designs48Stable$23€21$23€21Check ↗
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Intellijel Designs Stereo Out Jacks 1UIntellijel Designs48Stable$27€24$27€24Check ↗
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Intellijel Designs USB Extender 1U/3UIntellijel Designs48Stable$49€44$49€44Check ↗
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Intellijel Designs GxIntellijel Designs48Stable$87€78$87€78Check ↗
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Intellijel Designs QxIntellijel Designs48Stable$87€78$87€78Check ↗
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Der Mann mit der Maschine P2B8 ControllerDer Mann mit der Maschine48Stable$121€108$121€108Check ↗
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Der Mann mit der Maschine P4B2 ControllerDer Mann mit der Maschine48Stable$140€125$140€125Check ↗
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Der Mann mit der Maschine G8 ExpanderDer Mann mit der Maschine48Stable$165€148$165€148Check ↗
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Der Mann mit der Maschine E4 ControllerDer Mann mit der Maschine48Stable$188€168$188€168Check ↗
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Intellijel Designs CVx 1UIntellijel Designs48Stable$196€175$196€175Check ↗
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Der Mann mit der Maschine DB8E Display/ControllerDer Mann mit der Maschine48Stable$199€178$199€178Check ↗
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Der Mann mit der Maschine X7 ExpanderDer Mann mit der Maschine48Stable$252€225$252€225Check ↗
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Der Mann mit der Maschine B32 ControllerDer Mann mit der Maschine48Stable$300€268$300€268Check ↗
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Doepfer A-126-2 ExpanderDoepfer46Stable$54€48$54€48Check ↗
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Doepfer A-149-2Doepfer46Stable$66€59$66€59Check ↗
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Expert Sleepers ES-5 mk4Expert Sleepers46Stable$155€139$155€139Check ↗
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4ms Listen Up4ms45Stable$73€65$73€65Check ↗
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vpme.de SixSwitchesvpme.de43Stable$50€45$50€45Check ↗
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OXI Instruments Split 2HPOXI Instruments43Stable$76€68$76€68Check ↗
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Shakmat Modular Bard Quartet ExpandShakmat Modular43Stable$111€99$111€99Check ↗
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Ohmforce Bohm PerformerOhmforce43Stable$111€99$111€99Check ↗
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OXI Instruments Pipe MKIIOXI Instruments43Stable$123€110$123€110Check ↗
- 50
Erica Synths Graphic Resonant FB ExpanderErica Synths43Stable$129€115$129€115Check ↗
Expander Modules by the numbers
Measured across all 68 models we track, not a sample.
Median $123 — half of all expander modules here cost less.
How to choose the best expander modules
Noise Floor
This is HUGE. A noisy expander makes everything else sound muddy. We're looking for modules that keep things quiet, especially when stacking oscillators or complex modulation.
Voice Count & Stability
'4 voices' sounds great until one drops out mid-song. We checked for reliable voice tracking and consistent performance across all available voices.
Modulation Options
Expander modules often act as the glue between your core sound sources. Good modulation routing and flexible routing options are key to unlocking its potential.
CPU/Memory Usage (if applicable)
Some expanders are software-based or rely on heavy processing. We looked for efficient designs that won't choke your host system or introduce latency.
Build Quality & Reliability
Let's be real, modules in this price range sometimes have flimsy pots or questionable wiring. We prioritized modules that feel solid and show signs of decent construction.
Buying guide
So, you're diving into modular and realizing expander modules are essential for getting more voices or features without breaking the bank? Totally get it. Finding quality expanders under $300 is a challenge, but not impossible. We're focusing on modules that actually do something useful, not just look cool on a panel - let's find you something that'll add some serious sonic muscle.
At this price point, expect some compromises. You won't get the pristine audio quality of a $500+ expander, and some modules might have limited routing options. Focus on modules that address your specific needs - do you need more oscillators, more filters, more LFOs?
Don't get seduced by features you won't use; a simple, reliable expander will always outperform a feature-bloated one.
How the AudioFu Index works
Five measured signals and nothing else — no stars from strangers, no “tested by experts” we didn’t do. The weights are fixed and public. We don’t play these instruments; we measure the market around them.
This chart covers 68 expander modules from the Thomann catalogue. Before you buy, read hands-on reviews and, where you can, play it. Full methodology.
AudioFu earns a commission when you buy through our Thomann links. It never changes the order — the index does.
- Demand40%
How many of this exact model are for sale on Reverb right now — what musicians actually buy and resell.
- Lineup20%
How many finishes Thomann stocks — makers expand the models that sell.
- Price15%
Where the price has moved since we started tracking in August.
- Specs15%
How completely the maker documents it.
- Maker10%
How deep the brand’s range is in this category.
Questions
What's the difference between an expander and a sequencer?
An expander adds functionality - more voices, effects, or modulation sources. A sequencer controls those functions, providing a sequence of notes or events. They often work together, but are distinct components.
Can I use an expander module to run multiple oscillators?
Absolutely! That's a common use case. Just be mindful of the noise floor and ensure each oscillator has a stable clock signal.
My expander is making a high-pitched whine. What's going on?
That's likely noise. Try different power supplies, shielding, and routing to isolate the source. Sometimes, it's just inherent to the module's design - cheaper components can be noisier.
I'm new to modular. What kind of expander should I get first?
Start with something simple that addresses a specific need. An expander with a few extra oscillators or a versatile multi-mode filter is a great starting point.
Are there any good DIY expander kits in this price range?
Definitely. Several reputable builders offer kits that provide a surprisingly good value, but be prepared for some soldering and troubleshooting. It's a learning experience!
