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[Differences and how to choose] A thorough comparison of Fractal Audio Ax-Fx III, FM9 Turbo, and FM3 Turbo [Recommendations for different uses]

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Fractal Audio Systemshas gained tremendous support from professional guitarists and home recording creators.High-end modeling processorIt is a prestigious brand.

In particular, the three current models:Axe-Fx III Mark II Turbo / FM9 Turbo / FM3 Turbo──Although they are based on the same amp modeling technology, "Cygnus," there are significant differences in performance, size, operability, and price.

  • "Which one should I choose for my purpose?"
  • "I want to use it for live performances, but I don't want to compromise on home recording either."
  • "I want to know the balance between cost and specifications."

For guitarists who have such concerns,A flat comparison of the features of all modelsWe will explain so you can find the one that is best suited for you.

In addition, we also provide reviews (good and bad) from actual users to help you make a choice you won't regret.

After reading this article, you will clearly understand the differences between Fractal Audio's three models and how to choose one.

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Fractal Audio | Model Overview

Specification comparison table

can scroll
ModelAxe-Fx III
Mark II Turbo
FM9 TurboFM3 Turbo
Typerack mount
(3U)
Floor type
(9 switches)
Floor type
(3 switches)
SizeApproximately 48cm x 13cm x 29cmApproximately 51cm x 8.9cm x 23.7cmApproximately 28cm x 10.3cm x 23.6cm
weight約 6.9kg5.4kg約 3.3kg
DSP PerformanceDual-core TI DSP
(+25% in Turbo)
Dual core x 2
(+10% in Turbo)
Dual core x 1
(+10% in Turbo)
Amplifier BlockUp to 2 units can be used simultaneouslyUp to 2 units can be used simultaneouslyMaximum 1 units
Cavity Block2 units
(Maximum 8IR blend, FullRes compatible)
2 units
(Maximum 4IR blend)
1 units
(Maximum 2IR blend)
Number of EffectsMultiple simultaneous use possible
(Almost no upper limit)
Many effects can be used simultaneouslyThere is a limit to the number of simultaneous
(CPU dependent)
Input/output terminal4 inputs / 4 outputs
(XLR/Phone)
3 inputs / 3 outputs2 inputs / 2 outputs
Digital I/OAES/EBU + S/PDIF
(IN/OUT)
S/PDIF (IN/OUT)S/PDIF (OUT only)
USB Flash Drive8 in/8 out8 in/8 out4 in/4 out
FootswitchNot equipped
(External FC connection required)
9 switches3 switches
External controlFC up to 4 units
Pedals x 2
FC up to 2 units
Pedals x 3
FC up to 2 units
Pedals x 2 (TRS x 2)
Price rangeAbout 48 millionAbout 38 millionAbout 24 million
Comparison of each product

Axe-Fx III Mark II Turbo – Flagship Rack Model

Product Features
  • 3U rack mount type (no foot switch)
  • Overwhelming DSP processing power (+25% with Turbo)
  • Up to 2 amps, 2 cabinets, and multiple effects can be used simultaneously
  • Four stereo inputs and outputs, plus comprehensive digital I/O
  • Many unique features such as Tone Match, IR Capture, and FullRes IR
  • Compatible with optional foot controllers (FC-6/FC-12)
  • Can be used for everything from home recording to professional studios and large-scale tours

FractalTop-of-the-line rack model.
Equipped with the highest level of DSP performance and input/output terminals,Professional production and live performanceIt is a full-fledged specification that is also used.

Fractal
440,000 JPY(TAX+) (As of 2026:05, March 16, 01 | Rakuten Market research)

FM9 Turbo – Floor-standing model with 9 foot switches

Product Features
  • Floor type with 9 foot switches
  • 4-core DSP for high simultaneous processing power (Turbo version is +10% or more)
  • Two amps, two cabinets, and a wide range of effects can be used simultaneously
  • Supports the same sound quality and algorithms as Axe-Fx III
  • Complete your live performance with this standalone device. USB 8in/8out for home recording too
  • The weight is about 5.4kg, which is a little large.
  • Many people say that this is the most well-balanced and "most practical model."

High-end floor-mounted model.
Equipped with 9 switches for immediate use in live performance, this well-balanced, all-purpose machine has processing power and expandability approaching that of the Axe-Fx III.

Fractal Audio
385,000 JPY(TAX+) (As of 2026:05, March 16, 04 | Rakuten Market research)

FM3 Turbo – Compact model with 3 foot switches

Product Features
  • Compact floor type with 3 switches
  • 2-core DSP (Turbo +10% or more)
  • One amp, one cab, and basic effects can be used simultaneously
  • USB 4in/4out for home recording
  • Compact and easy to carry, weighing approximately 3.3kg
  • Expanded operability with external footswitches and pedals
  • Popular as an entry-level, secondary, or portable device

Fractal's smallest and lightestCompact Model.
Perfect for home recording or simple live use, and recommended for those new to Fractal.

Fractal
242,000 JPY(TAX+) (As of 2025:05, March 26, 17 | Rakuten Market research)

Fractal Comparison | Differences in foot switches and user interface

Axe-Fx III – Panel and software operation

The Axe-Fx III does not have a foot switch, butLarge LCD and 5 encoder knobsThis allows for intuitive operation.

In addition, Fractal's official PC editor (Axe-Edit) is compatible with all models.Drag-and-drop visual routingCan.

You can create presets and edit complex effect chains on your PC, which covers the operability of the hardware.

FM9 – Various layouts with 9 switches

The FM9 is equipped with nine foot switches, allowing dual action of tap (short press) and hold (long press).
Additionally, the color LED ring and mini LCD display make it easy to see the current switch function.

"Layout" functionThis allows you to flexibly assign scene switching, preset recall, effect ON/OFF, etc.
Its ease of operation and visibility make it highly practical for live performances, and it is designed to be reliable in the field.

FM3 – 3-switch operation system

Since the FM3 has only three switches,Mode switching operationThis is the premise.

  • Switch A: Preset/Bank Switching Mode
  • Switch B: Scene switching mode
  • Switch C: Effect operation mode

In this way, one switch is designed to serve multiple purposes.

However, some people have complained that holding down the buttons during live performances was cumbersome and stressful, so adding an external switch (such as the FC-6) may make operation more stable.

Fractal Comparison | Differences in sound quality

The sound from Fractal Audio is very high quality across all models.
The Cygnus modeling engine reproduces the picking response and texture of a real amplifier.

The basic sound quality is the same

  • All models are equipped with over 289 amp models.
  • IR (impulse response) can also be handled in a common format.
  • When using the same preset, there is almost no difference in sound quality between FM3 and Axe-Fx III.

Axe-Fx III

FM9 Turbo

FM3 Turbo

Differences in algorithms (FM3 has limitations)

  • Axe-Fx III and FM9 are fully capable of running the latest algorithms.
  • Due to CPU limitations, FM3 uses some older algorithms.

For example, the latest reverb/pitch shifter may be a simplified version in FM3.

The limitations of pitch shifting and polyphonic processing

  • In FM3, delays and deterioration of sound quality may occur when processing Virtual Capo, etc.
  • The pitch block's tracking ability is also slightly inferior to that of the Axe-Fx III and FM9.

A/D and D/A conversion performance

  • All models are 24bit/48kHz with a dynamic range of approximately 114dB.
  • Input and output noise is extremely low, and Fractal has a reputation for being quieter than other companies' products.

Headphone output

  • All FM3/FM9/Axe-Fx III models from Mark II onwards are equipped with a headphone output.
  • Designed for peace of mind when practicing or recording at home.

Fractal Comparison | Reviews and Reputation

Axe-Fx III

Positive reviews
  • "Sound and feel that's close to a real amp"
    → People were amazed at the responsiveness and expressiveness, which was comparable to that of the actual amplifier.
  • "Overwhelmingly useful for production and recording"
    → Highly rated for its comprehensive range of production-oriented features, including Tone Match and IR Capture.
  • "It has a wide range of inputs and outputs, and offers great freedom in setup."
    → Ideal for professional use with multiple outputs and multiple effect loops.
  • "The peace of mind of being able to permanently install it in a rack"
    → Since it does not need to be placed on the floor, it also helps to reduce the risk of trouble.
  • "It's convenient to be able to separate the foot switch from the main unit."
    → Place the unit at the side of the stage or inside a rack, and keep the space at your feet to a minimum.
Negative reviews
  • "The price is too high"
    → The unit and foot controller together cost over 50 yen. It's hard to buy for a hobbyist.
  • "It's big, it's heavy, and it takes up a lot of rack space."
    → If you don't have a rack at home or in your personal studio, the hurdle for implementation is high.
  • "A little inconvenient for live performances"
    → It cannot be operated by foot on its own, so a separately sold FC is essentially required.
Fractal
440,000 JPY(TAX+) (As of 2026:05, March 16, 01 | Rakuten Market research)

FM9

Positive reviews
  • "The best overall balance"
    → Many people say this is the "best model" in terms of balance between sound quality, performance, operability, and price.
  • "Ready for live performances"
    → Operation is completed with 9 switches. No separate foot switch is required, so it can be used immediately during live performances.
  • "Sound quality comparable to the Axe-Fx III"
    → Many people say that they feel almost no difference in sound quality despite using the same algorithm and supporting IR.
  • "Professional guitarists are also moving to FM9."
    → Guthrie Govan and Neal Schon use FM9 in their live performances.
  • "Great for home recording, and a high-performance USB I/F"
    → 8in/8out for smooth re-amping.
Negative reviews
  • "It's a little heavy."
    → At about 5.4 kg, it is quite heavy for a floor-mounted device. Some people find it inconvenient to carry it around frequently.
  • "There was a time when availability was poor."
    → Immediately after release, there was a long waiting list for reservations. Things are improving now.
  • "External expansion is limited."
    → Up to two FCs can be added. It is slightly less flexible than the Axe-Fx III.
Fractal Audio
385,000 JPY(TAX+) (As of 2026:05, March 16, 04 | Rakuten Market research)

FM3

Positive reviews
  • "Small but amazing quality"
    → Many people who only need one amplifier say they are very satisfied with this one unit.
  • "The most affordable price range"
    → An ideal entry model for users new to Fractal.
  • "It's incredibly easy to carry"
    → It weighs just 3.3kg, so you can easily carry it in your backpack.
  • "A sufficient number of effects"
    → Drive and spatial effects are also available, making it perfect for home recording or small-scale live performances.
  • "Operability can be expanded with external switches"
    → Additional switches can be connected via the TRS terminal, allowing for customization later.
Negative reviews
  • "There are not enough foot switches, so it's difficult to use live."
    → There are many long presses and page switches, so some users find it hard to use intuitively.
  • "DSP performance is limited"
    → Ambient or heavy patches may cause CPU insufficiency.
  • "Some effects are simplified versions"
    → There are differences in algorithms between higher-end models for pitch shifting, reverb, etc.
  • "Expanding ends up being expensive."
    → If you add FC, etc., the final cost may end up being the same as FM9.
Fractal
242,000 JPY(TAX+) (As of 2025:05, March 26, 17 | Rakuten Market research)

Fractal Comparison | How to choose according to your purpose

Assuming a live performance

If it's a live show

FM9 Turbo
→ Equipped with 9 switches, it is fully compatible with live performances on its own.
→ High visibility and flexible layout switching provide peace of mind even in the field.
→ One user said, "It covers 99% of my needs."

FM3 Turbo
→ Lightweight, compact and easy to carry.
→ The number of switches is small, but can be expanded.
→ Suitable for small-scale live performances and space-saving setups.

Axe-Fx III Mark II Turbo
→ Supports live performances when combined with the separately sold FC-6/FC-12.
→ Good for complex routing and multi-out configurations.
→ The rack system allows the signal processing unit to be placed on the side of the stage for added security.

Intended for home recording and studio use

For studio and home recording

Axe-Fx III
→ Abundant production features including Tone Match and IR Capture.
→ USB 8in/8out, abundant I/O allows for flexible recording.
→ Ideal for permanent installation in a rack.

FM9 / FM3
→ High performance as a USB audio interface.
→ FM9 has ample room for recording tracks and IR processing.
→ FM3 can ensure sufficient sound quality with a minimum configuration.

Ultimately, the common understanding among users is this:

"For home recording only, use Axe-Fx III. For live performances, use FM9."

This quote sums up the real-life experiences of many Fractal users.

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An older sister I often see

Please use Sound House again next time.


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