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Audia Flight FLS4
FLS4 Stereo Power Amplifier
The Audia Flight FLS4 Stereo Power Amplifier is an incredible stereo power amplifier with high response speed (bandwidth more than 0,7MHz),
high power (up to 700 Watts), and nearly unlimited speaker driving/control capability. Like the Strumento Series we’ve used our trained human ears
to aide us in the FLS 4’s design process. This effort has allowed us to produce an amplifier that more closely achieves our goal of sonic perfection,
much like a luthier uses years of experience, craftsmanship, and keen ear to find the perfect tonal character and emotional response for their instruments.
Like its Strumento brethren the FLS4’s chassis begins its life as an ultra high grade, bespoke aluminum cast.
After the CNC finishing work is completed, every part is then closely inspected and “mirror polished” by hand.
Some critical areas are further finished by hand, with shot peening and anodization completing the beautiful metal work.
The final touch is an elegant silk-screening process.
Similarities to the Strumento Series amplifiers can be found within the FLS4 as well. A long list would include a fully balanced circuitry,
highly selected components, 32 high grade power devices, and power supply built with low impedance capacitors (288.000µF alone on the main power suppliers).
The FLS4’s gain stage is once again the exclusive Audia Flight design consisting of an entirely class A current-feedback circuitry.
And to further isolate this critical part of the amplification process from interference and grant thermal stabilization for all of its discrete components, the gain stage is enclosed within an aluminum box and encapsulated in an epoxy resin. Add to this that the main power supply is made by n.16 18.000µF 50V low impedance capacitors and is then composed of two super high current power supplies per channel, as well as four stabilized independent stages per each channel: two for the input stages and two for the Audia Flight current feedback stage! And, of course, as is our philosophy, one 15VA toroidal transformer is used for the logic control and protection circuit in order to completely isolate it from the audio circuit. With a total then of 12 power supplies, custom printed circuit boards with an extra high-grade surface copper, a 2000VA toroidal audio transformer enclosed within two ferromagnetic shields and encapsulated by epoxy resin powering the output stage, no fuses in the main power supply for the output stage (we find fuses are like a “resistors” and can negatively impact the sound) as a current sensor read by microprocessor is employed,
and 200 Watts RMS @ 8 Ohms output power one can see numerous “Strumento-esque” elements have gone into making the FLS 4 Stereo Power Amplifier capable of
providing the listener with the best performance and emotional musical experience.
So one can see in the FLS4 Stereo Power Amplifier the Audia Flight familial resemblance is hard at work. Much like our reference
Strumento N°4 mk2 Stereo Power Amplifier, the FLS4 Stereo Power Amplifier is designed to bring your music to life and your audio system to
another level of perfection.
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Professional Reviews 93/100
Deliciously Crispy
Sound Quality
94/100
Build Quality
94/100
Value for Money
89/100
With authoritative grip, a black background and finely judged tonal body, the Audia Flight FLS4 combines muscular bass control with a surprisingly fluid, refined midrange. Edgar Kramer praised its accurate dynamics, lifelike vocals and quiet circuit design, while its sculpted chassis and high-current delivery make it a compelling, high-end performer for demanding speakers.
What Reviewers Are Saying
Pros
Delivers powerful dynamics and tight, authoritative bass control with excellent low-end punch.
Produces a natural, body-rich midrange with subtle sweetness that avoids harshness or brittleness.
Maintains a very quiet background that preserves low-level detail and nuance.
Impresses with premium machined build quality and distinctive industrial design.
&
Cons
Its premium price keeps it in rarefied territory, even if the performance is judged strong for the class.
The speaker binding posts are good but not as upscale as those on Audia Flight’s top models.
SOUND QUALITY PERFORMANCE 94/100
Reviewers describe the FLS4 as extremely quiet, highly resolved, and very revealing of low-level nuance, with a black background that never obscures fine detail. It is also praised for tonal accuracy, subtle sweetness, and a vivid, lifelike presentation that keeps vocals natural and unforced while remaining highly engaging.
Transparency Resolution
96/100
Edgar Kramer calls the circuit design “extremely quiet” and says the amplifier will not obscure finer low-level nuance and detail “in any way whatsoever.” That points to a very clear, low-noise presentation with strong retrieval of subtle information.
Tonal Balance Musicality
94/100
The FLS4 is praised for accurate tonal rendition, body in vocals, and “ever-so-subtle sweetness” that avoids brittleness. The review also says chesty vocals are rendered with great body without being overdone, giving it a natural and musically satisfying character.
Dynamics
97/100
Reviewer language is emphatic here: “powerful dynamism,” “tight control,” “powerful punch,” and “sometimes startling dynamics” make it sound effortless and authoritative. The low end is described as having “unshakeable dominance,” with deep, concussive impact that stays controlled under pressure.
Soundstage Imaging
91/100
The review cites a “very wide and high soundstage with good depth perspective too,” and notes that Julia is placed in the room with satisfying lifelike presence. Imaging is clearly strong and stable, though the review spends less time elaborating on layering or pinpoint precision than on the amplifier’s tonal and dynamic strengths.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
94/100
The chassis and industrial design receive lavish praise, with repeated references to a massively solid machined aluminium body, quality heatsinks, shot-peened finishing, mirror polishing, and overall Swiss-precision execution. The review presents it as a serious, long-lived component with careful mechanical and aesthetic execution, while saying less about internal layout or long-term service details.
Value for Money
89/100
The review says the FLS4 “surpasses the expectation at the price point,” which is clear praise for value in its class. At this asking price, it still sits in rarefied company, but the reviewer’s message is that it delivers more than expected rather than merely justifying its premium cost.
Reviews
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Verified Dealers
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Authorized dealers for Audia Flight FLS4
- The Audio Association — in-store — Anaheim, California, United States (website)
- 110Hz — online and in-store — Kielce, Województwo świętokrzyskie, Poland (website)
- A/V Solutions — in-store — Pleasanton, California, United States (website)
- Absolute Hi End — in-store — Ormond, Victoria, Australia (website)
- Alma Music & Audio — in-store — San Diego, California, United States (website)
- Assai Audio — in-store — Centro, Comunidad de Madrid, Spain (website)
- Atelier 13 Audio — in-store — Forest Hills, Tennessee, United States (website)
- Audio Living Design — in-store — Area Produttiva, Marche, Italy (website)
- Audio Omega — in-store — Ourense, Spain (website)
- Audio Vision San Francisco — online and in-store — San Francisco, California, United States (website)
and 41 more verified dealers
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