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Resources
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Based on the successful entry-level MG-300 MKII, the NUX MG‑400 is a powerful dual-DSP guitar and bass modeler in a compact floorboard positioned to be "The Best Value Modeler" in the market. It features high-definition amp modeling, 10 flexible signal blocks, 3 scenes per preset, a built-in phrase looper, and USB recording/re-amping. With 512-sample IRs and an intuitive 2.8″ color LCD, it delivers studio-quality tone for practice, recording, or live performance.
Advance Amp Modeling
TSAC‑HD white-box technology provides realistic tube-amp tones with responsive dynamics.
Focused Amp Models
Features 36 high‑quality amp models: 28 electric guitar amps, 3 acoustic amp models, and 8 bass amps.
Impulse Response (IR) Support
Includes legendary preset cab IRs for wide range of uses plus the ability of supporting up to 12 3rd-party IR.
Block‑Style Effects & Routing
10 independent moveable signal blocks (NG, CMP, EFX, EQ, MOD, DLY, RVB, etc.) for a more customizable signal chain.
Built-In Looper & Drum Machine
Record, overdub, and layer tones with dynamic drum backing tracks for building riffs, testing tones, or performing solo sets.
QuickTone™ Editor Support
Edit amp models and effects, manage presets, load IRs, and configure USB‑C routing for recording or streaming.
NUX MG-400
Unmatched Value for a Modeler
Packs pro-level amp modeling, dual-DSP processing, effects, looper, and USB recording into a single floorboard—making it the best value modeler on the market.
NUX's TSAC-HD "White-Box" Amp Modeling
Tech at a Glance →
NUX's TSAC‑HD (True Simulation of Analog Circuit – High Definition) technology recreates the behavior of classic tube amplifiers with stunning realism. Unlike simple digital modeling, NUX's white-box approach simulates the actual circuit response of each amp, capturing the dynamic feel, warmth, and touch sensitivity of analog gear.
Dual DSP processors
One dedicated to amp modeling and the other to effects, letting you run more effects at once, stack complex signal chains, and enjoy smooth, studio-quality tone with virtually no latency
Ultra-low 2ms latency
Responds instantly to every note and nuance, giving you the natural, real-time feel of playing through a traditional amp — whether you’re performing live or recording in the studio.
Top-Shelf Amp Tones, Digitally Perfected
Combined with the MG-400 amp modeling and effects, these IR options give you flexible, realistic sound for practice, recording, or live use.
36 Built-in Cabinet IRs
25 for guitar, 8 for bass, and 3 for acoustic—designed to capture the character of real legendary cabinets.
512-sample (IR) support
Process high-resolution IRs that capture microphone placement, room reflections, and cabinet character, delivering realistic amp tones.
Expandable IR library (Up to 12)
Upload up to 12 of your own third-party IRs, giving you plenty of tonal possibilities.
Legendary mic & mic positions
4 microphones × 3 positions each give you full control over tone, depth, and presence.
Fully Customizable Signal Block Routing
Whether you prefer a traditional setup or want to experiment with new combinations, you can freely move each block to create the signal chain that works best for your style via the Quicktone™ Editor App.
Straightforward Controls
Easy-to-read LCD display and simple front-panel knobs let you adjust amp models, effects, and parameters quickly—no deep menu diving required.
Full-Color LCD Display
Easy-to-read screen shows amps, IRs, effects, and signal chains at a glance, making navigation fast and intuitive even in low-light or live settings.
Physical Master Volume Knob
Adjust your overall output in real time with the physical master volume knob for better hands-on control while performing.
Select Knob For Simple Menu Scrolling
Navigate through patches, scenes, and settings quickly with a single rotary knob.
Three Front-Panel Parameter Knobs
Tweak amp settings, effects, and tone parameters directly for real-time control without having to dig through menus.
Expression Pedal w/ Toe Switch
Control wah, volume, or other effect parameters on the fly, with a built-in toe switch for added convenience.
Footswitches For Preset Switching
Effortlessly switch between presets or jump between three scenes within a preset while playing
Simple, Versatile I/O
Flexible, straightforward I/O that makes recording, streaming, and everyday playing easy.
Unlock the Full Potential of Your Rig
Quickly edit amp models, effects, and signal blocks, manage presets and scenes, and load your own IRs. Configure USB routing for recording or streaming with ease. QuickTone™ makes designing, organizing, and personalizing your tone simple and intuitive.
QuickTone™ Editor Feature →
Desktop Software for Tone Customization
Instead of navigating small screens or multiple menus on the floor unit, you can see the full signal chain, blocks, IRs and amps at once on your computer.
Real‑Time Interaction
When you tweak the physical knobs or effect parameters in the app, QuickTone reflects those changes in real time — giving you visual feedback for what you’re doing.
Preset Organisation
You can organize and manage your patches and “Pro Scenes” (for switching within a patch) via the app
Custom IR Loading
You can import your own impulse response (IR) files into the 24 user-loadable IR slots available in the MG‑300 MKII.
Block Routing Control
QuickTone allows you to reorder signal blocks (amps, effects, IRs) easily, giving you flexible control over how your signal chain is structured.
USB Routing Configuration
QuickTone supports different USB‑C audio routing modes, like NORMAL, USB Loopback, REAMP, and DRY OUT
Backup & safety
Helps you create backups of your patches, so you’re less likely to lose your settings if you update firmware or change hardware setups.
Firmware Updates
Keep your unit up-to-date with the latest features and improvements.
Specifications
Technical
- Sampling Frequency 48kHz / 32bit
- Input Impedance 470 kΩ
- Aux In Impedance 10 kΩ
- Output Impedance 1 kΩ
- Phone Impedance 47 Ω
- Dynamic Range 108 dB
- System Latency <2ms
Connectivity
- Input 1 1/4" (6.8 mm) jack
- Aux Input 1/8" (3.5 mm) mini jack
- Output L/R 1/4" (6.8 mm) jack
- Phones Out 1/8" (3.5 mm) mini jack
- USB USB-C
Hardware
- Dimensions 11.4 × 6.3 × 2.8 inch
- Weight 2 lb
What's Included
1 x MG-400 MKII, 1 x Power Adapter, 1 x USB-C Cable, User Manual