Fractal Audio Systems / AM4

New for December 2025! Fractal Audio Systems' world-class amp modeling technology is packed into a compact floor unit. Amp + Cab and a variety of effects create professional sound for any situation, simply and intuitively.

The AM4 delivers top-class sound and functionality comparable to Fractal Audio Systems' flagship models in an unprecedentedly compact and easy-to-use format.
Based on the same technology as the flagship Axe-Fx III, it packs a full range of features—industry-leading amp modeling, powerful speaker cab simulation, and a host of legendary stompboxes and studio effects—into a rugged, portable steel chassis. It's perfect for any environment, whether pedalboard, desktop, or stage.
Of course, it also features Expert Edit functionality, giving you access to unique, advanced parameters not found on the original.

The AM4 is a compact yet powerful amp.
It can be integrated into a pedalboard, placed on a studio desk, stowed in a backpack with an expression pedal, or used as a minimalist system for easy transport on airplanes and bullet trains.
Equipped with USB audio and a headphone jack, it can also be connected to a PC (Mac/Windows) for mobile guitar recording. It's an incredibly compact, all-in-one unit. *Power amplifier not included.

■Features
・Industry-leading amp modeling:
AM4 features the latest amp modeling from Fractal Audio Systems, boasting accurate tone, dynamic feel, and ongoing updates. Our proprietary technology models each component of the analog circuit, ensuring behavior identical to that of a real amp.

・Full-featured speaker cabinet simulation:
Choose from over 45 Dyna-Cab™ models, visually check microphone positioning, and load UltraRes™ and standard format user impulses. It also includes a stereo room simulator.

・Four Amp + Cab Channels:
Each preset features four independent Amp + Cab channels with gapless switching. It's like having four premium amp pedals packed into a compact unit.

・High-quality effects:
Equipped with the Axe-Fx III algorithm (dozens of delays, over 77 drives, over 79 reverbs, and over 150 effect types including chorus, compressor, flanger, phaser, tremolo, wah, EQ, filter, gate, etc.).

・104 Presets x 4 Scenes:
104 customizable presets each consist of four blocks and four scenes. Each block has four channels, providing excellent flexibility with gapless switching.

・4 footswitches and 5 modes:
Instantly access presets, scenes, effects, tuner/tempo, and amp modes, and also feature custom colors and tap boost on/off functions.

・Ultimate Audio Quality:
An audiophile-grade signal path provides the superior sound quality, clarity, noise performance, and headroom required on stage and in the studio, plus a high-quality headphone output ideal for silent monitoring.

・Expression:
Connect up to two expression pedals or external switches for real-time control. Compatible with Fractal Audio Systems ""EV"" pedals and many other third-party pedals.

・Pro-Grade I/O:
Low-noise Auto-Z inputs, balanced TRS outputs, stereo analog inserts, S/PDIF I/O, and MIDI.

・4x4 USB Audio:
Record processed output, capture DIs, monitor computer audio, and re-amp tracks—all via USB.

・AM4-Edit:
A free editor/librarian for Mac and Windows PC that visually displays the entire AM4. Create and edit presets, import and export cabinets, and manage system settings. Plus, it includes special features like a block library and a scene manager.

Firmware upgrades:
New firmware updates add new amps, effects, features, improvements, and performance enhancements, making the AM4 even more refined over time.

■SPECS
Analog Input
・Connector: 1/4"" phone jack (unbalanced)
・Impedance: 1MΩ
*Lower if ""INPUT IMPEDANCE"" setting is applied
・Maximum Input Level: +20dBu

A/D Conversion
・Bit Depth: 24-bit
・Sampling Rate: 48kHz
・Dynamic Range: 114dB
・Frequency Response: 20Hz - 20kHz (+0/-1dB)

Analog Output
・Connector: 1/4"" phone jack (unbalanced) x 2
・Impedance: 1kΩ
・Maximum Output Level: +16dBu

INSERT SEND
・Connector: 1/4"" phone jack TRS
(Tip = Left / Ring = Right)
・Impedance: 1kΩ
・Maximum Output Level: +16dBu

INSERT RETURN
・Connector: 1/4"" phone jack TRS
(Tip = Left / Ring = Right)
Impedance: 1MΩ

Headphone Output
Connector: 3.5mm stereo mini jack
Impedance: 35Ω
(Recommended load impedance: less than 600Ω)

D/A Conversion
Dynamic Range: 114dB
Frequency Response: 20Hz - 20kHz (+0 / -1dB)

Digital Input/Output
Connector: RCA coaxial type (S/PDIF input/output)
Format: Uncompressed PCM
Sampling Rate: 48kHz (Fixed)

USB Audio
Format: USB 2.0 Class Compliant (USB Type-C)
Number of Channels: 4 (2 In / 2 Out)
*Each channel is internally mapped to a specific port
USB Audio Clock: 48kHz (Fixed)

MIDI
MIDI IN: TRS 3.5mm (Type-A)
MIDI OUT: TRS 3.5mm (Type-A)
-MIDI THRU:

Setting SETUP > MIDI/Remote > MIDI Thru to ""ENABLED""

MIDI IN signals can be passed through to MIDI OUT.

External Pedal
- Connectors: 2 x 1/4"" TRS phone jacks
- Supported Formats:
Expression pedal (10Ω - 100kΩ)
Footswitch (Momentary/Latching)

General Specifications
- Exterior: Powder-coated steel chassis
- Controls:
6 buttons
6 knobs
4 footswitches
- Display: High-brightness color LCD (480 x 272)
- Dimensions:
254.0mm (W) x 66.0mm (H) x 160.3mm (D)
- Weight: 1.56kg

Power Supply
- Power Specifications: 9VDC / 1.3A
- Power terminal: 2.1mm inner diameter (center negative)
- Internal battery: None
* Operation may not be normal if the included 9V/1.3A power adapter or a power supply with equivalent specifications is not used.

Recommended environment
- Operating temperature: 0°C to 50°C
- Storage temperature: -30°C to 70°C
- Humidity: Maximum 90% (non-condensing)