Flagship Tone, Compact Format, Easy to Use
The AM4 Amp Modeler brings the core sound and technology of Fractal Audio’s top-tier processors to our most portable unit yet. Built on the same industry-leading amp modeling algorithms found in the Axe-Fx III, it delivers authentic tube amp tone and feel, advanced speaker cab sims, and world-class effects in a rugged, pedalboard-ready design. With pro I/O, four channels per preset, gapless switching, and free AM4-Edit software, it’s a powerful platform for stage, studio, and everyday playing.
Key Highlights
Our Best Modeling Engine: Industry-leading amp modeling derived from the Axe-Fx III, using the same component-level physical modeling approach where tubes, transformers, tone stack, power supply and more are individually modeled for authentic behavior and interaction. Delivers accurate amp tone and feel, and continuous refinement through future firmware updates.
Speaker Simulation: Integrated directly in the amp block, the cab section features 45+ DynaCab™ models featuring real-time visual mic positioning, plus full support for UltraRes™ and standard User Cabs. Add built-in stereo room ambience without requiring a separate block.
Effects Library: A suite of stompbox and studio effects powered by the same algorithms as the Axe-Fx III, including 80+ drive models, 75+ reverbs, dozens of delays, and 150+ types across modulation, dynamics, filters, EQ, wah, and more.
Presets, Scenes, Channels: 104 presets, each a complete mini-rig with four blocks, four scenes, and four channels per block. Gapless switching ensures seamless transitions between sounds.
USB Audio: 4×4 USB audio interface for recording, playback, DI capture, and re-amping through the AM4.
Pro I/O & Connectivity: Low-noise instrument input with Auto-Z impedance switching, balanced TRS main outputs, stereo insert loop for external effects, S/PDIF I/O, MIDI, dual expression pedal inputs, and a dedicated high-quality headphone output.
Foot Control: Four onboard footswitches with five modes: Presets, Scenes, Effects, Tune/Tempo, and Amp Mode with one-tap output boost.
Build / Chassis: Compact, rugged steel enclosure designed for pedalboard, desktop, or standalone use.
AM4-Edit: AM4-Edit for Mac/PC with visual preset building, cab management, block libraries, controller setup, and integrated Fractal-Bot.
Firmware Updates: Free firmware updates add amps, effects, improvements, and new features over time.