Feliks Audio EOS Tube Amp Powers Both Headphones and Speakers For $14K

Personal audio has officially reached the point where $13,786 (€11,999) can be described as comparatively sensible.

I am aware of how ridiculous that sentence sounds.

But after watching Audio-Technica ask $108,000 for its NARUKAMI HPA-KG NARU headphone amplifier and matching ATH-AWKG headphones, Feliks Audio’s new flagship EOS starts looking almost fiscally responsible.

For the price of the NARUKAMI system, you could buy the EOS, a very serious pair of headphones, suitable high-efficiency loudspeakers and put a luxury SUV in the driveway with the money left over. Personal audio may have lost the plot somewhere along the way.

We first saw the Feliks Audio EOS in prototype form at HIGH END Vienna 2026, but the Polish manufacturer has finally published a proper product page and a substantially more complete set of production specifications.

And there is a lot more going on here than another expensive 300B headphone amplifier.

The EOS is designed to drive headphones, IEMs and loudspeakers from the same chassis, while also functioning as a balanced or single-ended preamplifier. Feliks rates headphone output as high as 8 watts and speaker output at up to 6 watts, adds a display that monitors the health of the amplifier and its tubes, and wraps everything inside a 57-pound chassis available in Oak or American Walnut.

Welcome to summit-fi in 2026. Apparently $1,000 headphone amplifiers are now the appetizer.

From Prototype to Production

The EOS sits above the Envy family as Feliks Audio’s flagship amplifier for conventional dynamic and planar magnetic headphones. The $22,800 Feliks Audio BLISS, which we heard at CanJam NYC 2026, remains the company’s statement product for electrostatic headphones. 

Feliks has been building tube amplifiers since 1998, and the EOS brings its headphone and traditional two-channel experience together in one product. Two 300B power tubes are paired with two CV181/6SN7 driver tubes, a combination already familiar to anyone who has spent time with the company’s Envy models. 

What has changed is the scope.

The EOS is not merely a headphone amplifier with preamp outputs that can eventually lead to a pair of loudspeakers. There are dedicated speaker outputs, and Feliks has finally put numbers behind them.

For headphones, the company specifies 5 watts at 1% THD, rising to a maximum of 8 watts at 5% THD. For loudspeakers, the figures are 4 watts at 1% THD and 6 watts at 5% THD. 

There is an important qualification.

Feliks does not specify the load impedance used for either power rating. We therefore cannot tell you that the EOS produces 5 watts into 32 ohms, 8 watts into 16 ohms or 6 watts into an 8-ohm loudspeaker because the manufacturer has not published that information.

From IEMs to Speakers?

Power is only half the story because Feliks is also claiming the EOS will work with headphones and IEMs with impedances as low as 10 ohms.

That is potentially more interesting than the headline wattage.

Large 300B amplifiers and sensitive IEMs do not always make particularly happy roommates; background noise and excessive gain can quickly turn an expensive system into an equally expensive collection of hiss.

Feliks says the EOS delivers the lowest distortion and widest frequency range of any amplifier it has produced, along with sufficiently low output impedance for sensitive headphones and IEMs. The company has not, however, published the actual headphone output impedance, frequency-response limits, SNR or noise-floor measurement. 

A Tube Amp With a Check Engine Light

One of the more practical EOS additions is the front display.

It shows input, output and gain settings along with a VU meter, but Feliks has also turned it into a diagnostic interface. Owners can view operating voltages, internal temperature and tube-health information, and run a diagnostic check from the front panel. 

There is also a remote control with motorized volume adjustment, input switching and gain control. Switching between headphones and loudspeakers does not require disconnecting either load.

Considering what good 300B tubes cost these days, knowing what is happening inside the amplifier before something expensive starts glowing the wrong shade of orange is not a frivolous feature.

The EOS is still unapologetically old-school amplification, but Feliks has clearly decided that owning tubes in 2026 does not require living like it is 1956.

Feliks Audio EOS Specifications

The EOS Has Some Expensive Company

Audio-Technica NARUKAMI HPA-KG NARU — $108,000

This is where the EOS suddenly becomes the Aldi weekly special.

Audio-Technica’s extraordinary HPA-KG NARU uses four Takatsuki 300B tubes in a fully balanced tube architecture with rare kurogaki woodwork, custom transformers and matching ATH-AWKG NARU headphones included for the $108,000 asking price. We have heard the system on multiple occasions, including CanJam NYC and AXPONA, and there is nothing remotely ordinary about its construction or presentation. 

Audio-Technica also publishes considerably more detailed measurements than Feliks currently does. The NARUKAMI delivers a specified maximum 1.6 watts into 32 ohms, 1.3 watts into 150 ohms and 1 watt into 600 ohms, although those figures are measured at 10% THD. Its official specification sheet also provides frequency response, noise, channel separation and gain figures. 

Do not interpret that as evidence that the EOS is automatically more powerful in real-world use. Feliks has not identified the load used for its ratings, and the distortion conditions are different.

What can be compared without qualification is functionality and price.

The Audio-Technica is a headphone amplifier and preamplifier. The Feliks can also drive loudspeakers directly.

The Who called that a “bargain.”

Almost. Probably a good time to check in with my therapist.

MASS-Kobo Model 491 — $20,000

The MASS-Kobo Model 491, which impressed us at CanJam London 2026, occupies far more comparable financial territory at $20,000.

Its fully balanced solid-state design uses independent left and right power supplies and delivers at least 3.5 watts per channel into 32 ohms through its balanced outputs. It is a purpose-built reference headphone amplifier, however, rather than the headphone amp, preamp and speaker amplifier combination offered by the EOS. 

That makes the Feliks proposition unusual even within this rarefied part of the market.

The Bottom Line

It would be very easy to spend the entire conclusion mocking the idea of a nearly $14,000 headphone amplifier.

Personal audio has certainly earned some of that. Five-figure headphones, $20,000 amplifiers and $108,000 systems have moved the goalposts so far that the goalposts are now somewhere outside the stadium and on the banks of the Lublinica River.

But the Feliks Audio EOS is harder to dismiss than another exercise in summit-fi excess.

This is a 300B amplifier designed to handle IEMs, dynamic headphones, demanding planar magnetics and actual loudspeakers, with balanced and single-ended preamp functionality, remote operation and onboard diagnostics. In the right system, it could replace several very expensive boxes.

Feliks still needs to publish the measurements missing from its specification sheet, particularly power by load impedance, headphone output impedance, frequency response and noise performance. At this price level, “trust us” should not be considered a technical specification.

Still, look across the room at Audio-Technica’s $108,000 NARUKAMI and something deeply troubling happens.

The $13,786 Feliks Audio EOS starts looking like value.

Oy vey iz mir.

Related Reading:

• The Best DACs, Headphone Amps And DAPs From CanJam London 2026
• Best In Show At CanJam NYC 2026: The Headphones, DACs, Amps, And IEMs Everyone Was Fighting To Hear
• Audio-Technica’s $108,000 Tube Headphone Amplifier Must Be Heard At CanJam NYC 2024