Amp modeling, speaker simulation, effects, and more.
On your pedalboard—and beyond—now easier than ever.

Pro Sound, Great Features, Easy to Use

The legendary sound of Fractal Audio for players who demand the best.
Loaded with fantastic features designed by musicians for musicians.

The AM4 Amp Modeler delivers great tone in a great package. It combines our latest Cygnus X-2 amp modeling, visual DynaCab™ speaker simulation, UltraRes™ user cabs, and a suite of impressive effects, with a streamlined workflow designed for players who want pro sound with less complexity. With a user interface inspired by traditional amps and pedals* AM4 places the full uncompromising sound of Fractal Audio in your hands—or, more accurately, at your feet.

Huge tone in a the palm of your hand.

A world of incredible performances at your feet.

The AM4 is a compact powerhouse. It’s perfect on a pedalboard, sits neatly on a studio desk, fits in a backpack with room for expression pedals, or slips into an overhead bag as your grab-and-go fly rig. With USB audio and a headphone jack, it doubles as a mobile guitar-recording setup with your Mac or PC. It’s our most compact all-in-one unit ever!

The Ins and Outs of Great Tone

Fractal Audio is known for building audiophile-grade signal paths into guitar products, and the AM4 is no exception. Its low-noise “secret sauce” instrument input with Auto-Z impedance authentically loads your guitar pickups, while balanced outputs preserve signal integrity when going direct. An analog stereo insert provides Send and Return jacks for outboard gear, and a high-quality headphone amp supports silent practice and monitoring. Two Pedal ports each accept an expression pedal or external footswitch. For digital connectivity, AM4 includes S/PDIF I/O, USB-C for MIDI and 4×4 audio with re-amping, and 3.5 mm MIDI In and Out. The AM4 is powered by the included 9V DC 1.5A adapter.

Accurate Amp Modeling

Real tube amp tone and feel through advanced physical modeling technology

Fractal Audio’s industry-leading amp modeling is at the heart of the AM4. Built on the same uncompromising technology as the Axe-Fx III, it delivers the tone, feel, and authentic controls of real tube amps—from vintage classics to modern monsters, from sparkling cleans to elusive edge-of-breakup tones, to molten leads—and everything in between.

Unlike “take-it-or-leave-it” capture systems, the AM4 gives you a fully adjustable amp model every time: familiar amp controls behave like the originals, so you can dial in the tone you want instead of hunting through endless snapshots of someone else’s settings.

FOUR CHANNELS, ENDLESS TONE

The amp block includes four channels, giving you gapless switching between four amp-and-cab tones in every preset. With 104 presets, and 240+ amp models, the AM4 covers the range of a warehouse full of amps.

INTUITIVE FOOTSWITCH CONTROL

New Amp Mode lets you select channels directly from the footswitches. The amp also includes a built-in tap-on/off boost, plus customizable channel colors. Other modes switch presets, scenes or effects and access tuner/tap tempo.

HANDS-ON CONTROL

In Amp Mode, simple, authentic controls stay on screen, making the AM4 feel as fast and familiar as an amp or dedicated pedal—with gain and tone controls modeled on the originals. Click the image to see four examples. 

Speaker Simulation, your way.

Choose from intuitive DynaCabs™ or load your favorite IRs.

Integrated directly into the amp block, 45+ classic and modern guitar and bass DynaCabs™ deliver realistic speaker tones with an intuitive interface that allows you to position virtual mics in real-time—making it fast and easy to achieve a desired tone. You can also load your favorite Impulse Responses (IRs), from Fractal Audio or third- party creators, using UltraRes™ User Cabs for complete flexibility. A built-in room sim adds ambient dimensional sound without a separate block.

VISUAL MIC POSITIONING

DynaCab™ lets you shape tone in virtually the same way audio engineers do—by moving a mic on a speaker. Brighter or darker, more or less low end proximity… just move the mic and listen. No studio chops required—and no more sorting through too many static IRs!

LOAD YOUR FAVORITE IRs

You can also load your favorite Impulse Responses (IRs), from Fractal Audio or third-party creators. AM4 supports standard IR formats and uses UltraRes™ processing to deliver enhanced performance and low-end detail.

World Class Effects

A suite of over 325 classic and cutting-edge stompbox and studio models.

The AM4 offers a suite of classic and cutting-edge stompbox and studio effects powered by the algorithms of the Axe-Fx III, vetted by so many of the world’s top guitar heroes. You get 77+ Drive models—overdrives, distortions, fuzzes, preamps, and boosts; 79+ Reverbs including plates, springs, halls, rooms, celestial shimmers, and special effects; dozens of Delays from tape and analog to pristine digital; and 150+ options across Chorus, Compressor, Flanger, Phaser, Tremolo, Wah, EQ, Gate, Filter, and more. The surface is fast and familiar—like classic hardware—while hidden Expert Edit pages unlock deeper controls and extensive modifier options for MIDI, pedals, LFOs, envelopes, and even a sequencer.

USB Audio and MIDI

USB gives the AM4 flexible features for recording, playback, and automation. You can record the AM4’s processed outputs or capture a DI for re-amping. You can play back computer audio through the AM4’s stereo outputs, or send tracks to the unit for processing, including re-amping. The AM4’s USB MIDI ports also appear in your DAW for automation and control.