Feliks Audio's Eos Puts a 300B Hybrid Stage Behind Both Headphones and Speakers

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Sep 1, 2026· updated Sep 1, 2026

The Feliks Audio Eos: a walnut-wrapped 300B hybrid amplifier with four valves, a central monitoring display and volume control, in raking daylight.

Feliks Audio has put detail behind the Eos, the 300B hybrid amplifier the Polish maker first showed in prototype form at HIGH END Vienna 2026. StereoNET covered the amplifier on 1 September 2026, and the framing is worth getting precise: the Eos is not the company's first amplifier capable of driving loudspeakers. Feliks already sells speaker amplifiers and splits its own catalogue into headphone and speaker categories. What is new here is that a single chassis is designed for both jobs.

One chassis, two very different loads

Feliks Audio is best known for valve headphone amplifiers — the Envy, Euforia and Echo are the names most listeners associate with the brand — and the company hand-assembles its amplifiers in Poland. The Eos takes that lineage and points it at a second target. Feliks states the amplifier is built to drive demanding dynamic and planar-magnetic headphones and suitably matched loudspeakers, from the same box.

That is a harder engineering brief than it may sound. A planar-magnetic headphone and a loudspeaker present wildly different impedance and sensitivity characteristics, and the noise floor tolerable on a speaker at listening distance is nothing like the noise floor tolerable a centimetre from an eardrum in a sensitive dynamic headphone. Manufacturers who attempt both from one output stage generally have to make choices about transformer taps, gain structure and residual hum that a single-purpose design does not.

On that point, Feliks makes a specific claim: the company describes the Eos as having its lowest noise floor to date, reportedly around ten times lower than its previous designs. That is the manufacturer's own figure, not an independent measurement — no third-party measurement of the Eos has been published, and no listening assessment has appeared either. Take it as a statement of design intent from the people who built it.

What Feliks has described

The published detail is modest but concrete:

Topology: a hybrid design using 300B valves. Feliks has not published a full valve complement or tube count beyond the 300B.
Loads: demanding dynamic and planar-magnetic headphones, plus suitably matched loudspeakers, from one chassis.
Monitoring: a central display that tracks valve life, tube-socket temperature and bias conditions.
Finishes: Oak and American Walnut.
Operation: remote control.

The display is the detail that says most about the intended owner. Valve life, socket temperature and bias state are the three things that separate a directly heated triode amplifier being run attentively from one being run on faith. Building that telemetry into the front panel rather than leaving it to a service visit or a multimeter suggests a design aimed at someone who will keep the amplifier for a long time and expects to re-tube it.

The gap in the story

Here is where the Eos gets genuinely interesting as a news item. European retailer listings place the amplifier at approximately 15,000 euros. That figure comes from retailer listings, not from Feliks Audio — the company has not announced an official price, and StereoNET's own wording is that final pricing may vary between markets.

Meanwhile, checked on 1 September 2026, the Feliks Audio website does not list the Eos in its published product range at all. The range as shown names the Envy, Euforia and Echo, and divides the catalogue into "Headphone Amplifiers" and "Speaker Amplifiers". No release date, shipping date or availability window has been announced for the Eos.

Nor has Feliks published a power output for loudspeaker use — not in watts, not in any other form. For an amplifier whose headline feature is that it drives speakers as well as headphones, that is a substantial blank. It also matters practically: "suitably matched loudspeakers" is a phrase that means very different things at 8 watts than at 30, and without a figure a prospective owner cannot begin the matching exercise. We are not going to infer one.

So the open question is a peculiar one. The Eos is detailed enough that its finishes, monitoring features and control scheme are known, and priced firmly enough by third-party retailers to sit at a specific point in the market — while the manufacturer itself has published neither the single most important specification for one of its two intended uses nor a date on which anyone can buy it. That tension is the story, and nothing in the available sourcing resolves it.

Where it sits against the Arioso

For positioning only, it is worth noting what Feliks already offers with 300B valves and a speaker output. The Arioso 300B integrated is described in coverage as a point-to-point wired, single-ended 8-watt Class A amplifier for loudspeakers. It is listed at US$9,999 by Upscale Audio, at US$8,895 by Headphones.com, and at 8,199 euros ex-tax on the manufacturer's own product page.

Against that, the roughly 15,000 euro retailer figure for the Eos represents something like one and a half to two times the Arioso's European price. The two are different amplifiers with different design goals, and the Arioso's power rating tells you nothing about the Eos. But it does establish that the Eos is being positioned well above the company's existing 300B speaker amplifier rather than alongside it — and nothing in the sourcing suggests the Eos replaces, supersedes or discontinues the Arioso, or the Envy, Euforia and Echo headphone amplifiers.

The Eos was also covered by Mono & Stereo, which corroborates that the amplifier exists, is a hybrid design and was unveiled at HIGH END Vienna 2026.

What comes next is straightforward to watch for: an official price from Feliks, a power specification for loudspeaker use, and the Eos appearing in the company's own published range. Until those land, the amplifier is a fully described product with two conspicuous blanks in its documentation.

Frequently asked questions

What is the Feliks Audio Eos?

The Feliks Audio Eos is a hybrid amplifier using 300B valves, made by the Polish valve specialist Feliks Audio. The company states it is designed to drive demanding dynamic and planar-magnetic headphones as well as suitably matched loudspeakers from a single chassis. It was first shown in prototype form at HIGH END Vienna 2026.

What price have European retailers listed for the Feliks Audio Eos?

European retailer listings place the Feliks Audio Eos at approximately 15,000 euros. That figure comes from retailer listings rather than from Feliks Audio, which has not announced an official price. StereoNET's coverage notes that final pricing may vary between markets.

How much power does the Feliks Audio Eos deliver into loudspeakers?

Feliks Audio has not published a power output for the Eos in loudspeaker use, in watts or any other form. The company describes the amplifier as suited to matched loudspeakers but has released no rating, so no power figure for the Eos can be stated as of 1 September 2026.

Is the Eos the first Feliks Audio amplifier that can drive loudspeakers?

No. Feliks Audio already sells speaker amplifiers, including the Arioso 300B integrated, and its website carries a dedicated Speaker Amplifiers category. What is new about the Eos is that one chassis is designed to handle both headphone and loudspeaker duty rather than one or the other.

When will the Feliks Audio Eos be available?

No release date, shipping date or availability window has been announced for the Feliks Audio Eos. As of 1 September 2026 the amplifier does not appear in the published product range on the Feliks Audio website, which lists the Envy, Euforia and Echo by name.