Revised version of a best seller

• Your introduction to tube sound – even entry level means high quality at Feliks Audio
• Warm “tubey” sound with plenty of details – easy listening at its best
• A fresh take on a classic – engraved wood and a refined new form for the modern aesthete

Specifications

• Impedance: 100 k ohm
• Frequency response: 15 Hz – 45 Khz +/- 3 dB
• Power output: 350mW
• Amplification level: 20dB
• THD: 0.4 % (300 ohm, 20 mW)
• Optimal headphones impedance: 80 – 600 ohm
• Headphones output: Jack 6.3mm

BOX CONTENT

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This Paltauf Audio – KHV ESD II amplifier allows you to use high-quality electrostatic or electrodynamic headphones. A transformer in the unit’s output converts the high signal voltage into a powerful output signal capable of driving even the most demanding electrodynamic headphones. 

This device combines all of our amplifiers’ strengths and virtues: naturalness, dynamics, colorful, multi-layered tones, and effortless playback of the most complex music signals.

Plus version with power supply unit with wooden side panels matching the amplifier and additional upgrade tubes.

Paltauf Audio – KHV ESD II Technology & Tubes

The KHV-ESD thus represents the trio’s universal tube genius. The output signal is generated by two triode-connected TUNG SOL EL84 per channel, in conjunction with a push-pull output transformer from the Swedish manufacturer LUNDAHL, with the signal for the electrostatic headphones tapped directly at the anodes of the end tubes.

The push-pull circuit with output transformer not only provides a sufficiently high operating voltage for all common electrostatic devices at all times but also quite impressive power reserves on the secondary side for all (ortho)dynamic ear loudspeakers, which are typically driven with relatively low signal voltages.

The triode operation also causes the end tubes to be low-impedance, which is responsible for the tube amplifier’s high upper limit frequency, among other things. 

Furthermore, the PALTAUF KHV-ESD has extremely low distortion because the K2 distortions that are primarily produced in the tubes are almost completely eliminated in the output transformer.

The phase reversal stage, which is precisely implemented in the PALTAUF KHV-ESD using semiconductors (Mosfets). It is critical for the proper operation of a push-pull amplifier. This allows two signals to be offset by exactly 180° with perfect phase and amplitude symmetry far beyond the audible range.

An interference-free power supply is also required to ensure excellent signal quality from the tube amplifier at all times. Especially if the output tubes are connected as triodes. Both EL84 pairs include proper stabilization circuitry, as well as a preamp section and phase inversion.

Aesthetic Sound with Optimum Comfort 

The Austrian tube amplifier produces a strong sound center while ignoring the other frequency ranges. Analytical headphones. In particular, such as the AKG 812 PRO, benefit from the KHV-body-rich ESD’s fundamental tone. Which gives voices and instruments an incredible degree of plasticity.

The PALTAUF’s fascinating way of meticulously resolving complex musical events. As it was perfectly separated and fixed point-stable in space, undoubtedly has a world-class format. The tube amplifier also highlights the most subtle shades in excellent recordings. Never losing sight of the big picture due to acoustic focus.

The KHV-ESD also has a lot of pressure and excellent impulse fidelity in the bass range. Even in comparison to the performance-hungry HIFIMAN SUSVARA. The PALTAUF impresses with an exemplary structuring of dynamic bass lines without softening the contours at high listening levels. Awful headphone cinema.

Only in the deep bass does the tube amp fall short of my reference RIVIERA AIC10. Because the latter simply descends a few levels deeper into the frequency range. While also illuminating the farthest corners even more studiously – albeit at a much higher price.

Last Thought about Paltauf Audio – KHV ESD II

The exceptional musical performance and high functionality. Should more knights of the grail of fine tones fall for the Austrian sirens in the future? It is hoped that Wolfgang Paltauf will not fall too far behind with the manual production of his range of amplifiers. An amp to lead them, find them, drive them into the light, and forever bind them.

Paltauf Audio – KHV ESD II Specification:

• For electrostatic headphones
  Max. Output voltage 900 Vpp
• For electrodynamic headphones
  Max. output voltage Output voltage 36 Vpp
• Loud output:
  15 Ohm 5.6 W
  120 Ohm 1.5W
  600 Ohm 0.3W
• Quiet output:
  15 Ohm 1.2W
  32 Ohm 0.6W
• Frequency response: 20Hz (-0.45db ) to 85,000Hz (-1db)

  Connections

  Inputs:

• 2x stereo high-level inputs RCA
• 1x stereo high-level input XLR balanced

  Outputs:

• 1x 5-pin output, Pro Bias
• 1x 6-pin normal bias output
• 1 x 4-pin XLR output with low output voltage
• 1 x 6.35 mm jack output with low output voltage
• 1 x 4-pin XLR output with high output voltage
• 1 x output jack 6.35 mm with high output voltage
• 1 x stereo preamp output RCA adjustable

  Dimensions
  Depth: 34 cm
  Width: 38 cm
  Height: 14 cm

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The Bacillus II + takes the technology of its smaller brother Bacillus II to an entirely new level. With a triple-reinforced power supply—dedicated to each channel and the auxiliary electronics—this amplifier boasts a true dual-mono design, delivering unparalleled clarity and separation in sound.

But Erzetich didn’t stop there. The architecture is now fully balanced, doubling both the speed and power for a performance that’s as dynamic as it is precise. Need unbalanced inputs or outputs? They’ve got you covered for ultimate flexibility.

Encased in a robust metal body, the Bacillus II+ is built for durability and magnetic shielding. The elegant wooden side panels not only add a touch of sophistication but also tie it seamlessly to our signature amplifier design.

Technical Specifications

• Headphone impedance: 8–600 ohm
• Frequency response: 0.5 Hz–900 kHz, -1dB (balanced mode); 4 Hz–450 kHz, -1dB (unbalanced mode)
• Output power (per channel): 314 mW (balanced mode), 157 mW (unbalanced mode)
• Outputs: 4-pin XLR (balanced), 6,35 mm jack (unbalanced)
• Inputs: 3-pin XLR (balanced), RCA (unbalanced)
• Power consumption: 9 W
• Power supply input voltage: 230 V/50 Hz or 115 V/60 Hz
• Dimensions (W x H x D): 260 mm x 105 mm x 240 mm
• Weight: 2990 g
• Character: Detailed and fast, without being bright

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The Bacillus II is Erzetichs entry-level headphone amplifier, yet it’s designed for those who want more from a compact setup. Outfitted with high-grade input capacitors and premium op-amps, it delivers a sound profile that combines warmth with speed, punch, and impressive detail.

Versatile enough to pair with headphones of any impedance, the Bacillus II ensures a smooth and dynamic listening experience. With an exceptional ability to reveal subtle nuances, it distinguishes tonal variations and enhances details, capturing the richness in every note that many amplifiers miss.

Its unique design—featuring a large, original volume knob, an angled top, and wooden side panels—makes the Bacillus II a stylish addition to any desk.

The Bacillus Tilia headphone amplifier earned a dedicated following for its powerful, detailed sound. Building on its legacy, Bacillus II introduces upgraded electronics and a refined design. While we’ve replaced the fully wooden chassis with a durable metal body, we’ve kept the wooden side panels to honor its classic look.

Bacillus II (along with Bacillus II +)is also designed to visually complement our flagship models, Deimos and Scylla, creating a cohesive and stylish lineup.

Technical Specifications

• Headphone impedance: 8-600 ohm
• Output power: 157 mW
• Frequency response: 2 Hz – 800 kHz, -1dB
• Power consumption: > 3 W
• Power supply input voltage: 230 V/50 Hz or 115 V/60 Hz
• Dimensions (W x H x D): 145 mm x 70 mm x 180 mm
• Weight: 1130 g
• Character: Silky neutral, slightly warm

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Inspired by the German concept of “Meisterwerk,” meaning “masterpiece,” this amplifier lives up to its name with exceptional attention to detail, both in performance and aesthetics.

“As Feliks Audio’s long-standing partner, we were inspired to create a unique masterpiece that celebrates our collaboration. Envy Meisterwerk is more than a high-performance amplifier – it’s a fusion of art, design and sound that elevates the way we experience music,” said Thomas Halbgewachs, Owner of Headphone.Shop.

Key Features

• Legendary Western Electric 300B Tubes: Envy Meisterwerk features the first-ever integration of these iconic tubes in a Feliks amplifier.
• Precision Engineering: Optimized internal circuitry and extremely tight selection of supporting driver tubes, maximizes the performance of the 300B tubes for clarity and depth.
• Stunning Wood Finishes: Available in elegant ebony or striking zebrano, each piece showcases exquisite craftsmanship.
• Sustainable Sourcing: Crafted from responsibly sourced materials, embodying luxury with a conscience.

Organic Resonance

In perfect harmony with the natural world, the Envy Meisterwerk comes in a solid zebrano finish – one of the most sought-after and visually stunning woods nature has to offer. Zebrano’s bold, dynamic grain and warm tones perfectly match the Envy hardware and infuse energy and elegance into any space.

The process of sourcing and shaping this material is itself a “Meisterwerk”, resulting in a natural yet refined finish that sets this headphone amplifier apart as a true design statement.

A Bold Step Forward

At the heart of the Envy Meisterwerk we have the legendary Western Electric 300B tubes. For the first time ever, Feliks Audio has integrated these tubes into one of their amplifiers, meticulously tuning the internal circuitry to unleash their full potential.

The result? Nothing short of breathtaking. Expect a sound that is rich, dynamic, and full-bodied, with sweet tones, seductive vocals, and a soundstage that feels as expansive as it is intimate.

“Integrating Western Electric tubes into our Envy Meisterwerk marks a significant leap forward for Feliks Audio. This achievement unlocks a new dimension of sound, allowing us to capture the emotional essence of music in a whole new way.” – Feliks Audio

The Envy Meisterwerk elevates these tubes to their fullest potential. Feliks Audio meticulously optimized the amplifier’s internal circuitry and hand-selected components to create a synergy with the 300B tubes, resulting in a finely tuned system that takes you back to the golden age of hi-fi.

Western Electric: A Legacy in Sound

As the inventor of tube technology, Western Electric has been a pioneer since the 1900s. Introduced in 1938, the 300B tube is a direct-heated triode, designed to meet the highest standards of audio amplification. Western Electric has remained true to its origins, maintaining strict quality standards and producing tubes that last for nearly 40,000 hours. With incredibly low distortion and unmatched longevity, the 300B – now backed by an exceptional 5-year manufacturer warranty – continues to define what is possible in high-performance audio.

Specifications

• Weight: 15,1 kg
• Dimensions: 35 × 33 × 18,5 cm
• Power tubes: Western Electric 300B
• Driver tubes: PsVane CV-181 Mk2 (top 5% tolerance selection)
• 2x unbalanced RCA inputs (IN1, IN2)
• 1x balanced XLR input (IN3)
• Headphone outputs: 6.3mm and XLR
• Frequency response:
  • 8Hz÷100kHz ±3dB
  • 18Hz÷40kHz ±1dB
• Output powered measured at MID gain setting at load of 16Ω is 5W with THD ⩽1% (maximum 8W at THD >5%)

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Amps like the Aegis, that are transformer coupled, possess the ability to output at different impedances to match both objective headphone power needs, and subjective preferences, as well as delivering ample power at the different impedances of each driver. ZMF has headphones of varying needs, that benefit from headroom above their power requirements. The Aegis possesses the power, malleability, and timbral characterizes to make every ZMF and really any dynamic or planar headphone shine.

Being a transformer coupled amp, the Aegis has a LOT of IRON in transformers, chokes, and a huge power supply. All of this means that the “foundation” of sound coming from the Aegis is substantial, and you can hear it.

We may be able to change the aesthetic of the Aegis from time to time, but since we use an OEM to make the Aegis, it will likely be at most changes once per year.

The 4.4mm jack on the Aegis uses a voltage divider, which in layman’s terms means that you can use very sensitive IEMs and headphones on the 4.4mm, and still have full use of the range of the volume knob.

Insights from Keenan – the designer of the Aegis

1. Tube amplifiers offer a unique listening experience that is euphonic, natural, and musical made possible by simple circuits with clean signal paths. Most people are shocked at the clarity and spaciousness that tube amplifiers can achieve, it’s something everyone should try at least once. Listening is believing!

2. Generally, single-ended triode amplifiers achieve 3:1 damping ratios, meaning the headphone impedance is at least 3x the output impedance of the amplifier. But some may prefer either higher or lower damping ratios. You can try the various impedance settings and see what sounds best to you with your favorite headphones, there is no hard and fast rule.

3. I learned to design single-ended tube amps by experimentation, coming up with circuit ideas, prototyping them in the real world, then listening and measuring. A high degree of clarity, spaciousness, and musicality can be achieved in a tube amp if following simple design rules. That means keeping signal paths short, the circuits simple, and the distortion relatively low within the confines of single-ended tube design.

4. On average, Aegis is a 2-watt amplifier, although power output will be slightly higher or lower depending on the impedance setting and headphone impedance. Headphone transducers are low power devices requiring power outputs on the order of milliwatts; 2 watts of power is plenty to drive even the most demanding headphones. Power output is a function of the amplifier’s output voltage and the impedance of the headphone transducer; power will vary depending on the impedance setting and the headphone being used. Amplifier gain is the degree to which an amplifier boosts the input signal voltage, usually expressed in decibels (dB).

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Prepare to be captivated by the formidable yet awe-inspiring performance of the Erzetich Scylla. This fully-balanced dual-mono class-A headphone amplifier transcends expectations with its expansive and immersive sound, seamlessly merging with the music in a flawless display of neutrality. Scylla propels premium headphones to unprecedented heights, and when paired with our Charybdis headphones, it creates an unbeatable synergy, elevating your audio experience to unparalleled realms of bliss.

Discover Sonic Elevation: Unveiling the Erzetich Scylla Headphone Amplifier

Erzetich faced frequent inquiries about the absence of balanced features in their flagship headphone amplifier, Deimos. Upon careful consideration, especially in conjunction with Phobos headphones, this was a deliberate decision based on extensive testing. However, with the introduction of the exceptional Charybdis headphones, the need for a complementary amplifier became apparent. Thus, Scylla was conceived, specifically tailored to this purpose.

In their commitment to elevate Deimos to new heights, Erzetich embarked on an innovative journey. Augmenting the power supply, implementing a balanced design, and selecting superior electronic components were key steps. The result exceeded expectations—Scylla emerged as a marvel, offering a more relaxed and expansive soundstage, defying initial assumptions. This unexpected and extraordinary listening experience surpassed their aspirations, creating a harmonious synergy with Charybdis and setting a new standard in audio excellence.

Technical Specifications

• Headphone impedance: 8-600 ohm
• Frequency response: 4 Hz-40 kHz, -1dB
• Power consumption: 25 W
• Power supply input voltage: 230 V/50 Hz or 115 V/60 Hz
• Dimensions (W x H x D): 510 mm x 140 mm x 330 mm
• Weight: 9300 g
• Character: Vast and uniform

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The Deimos stands as our paramount headphone amplifier, catering to discerning audiophiles. With solid resolution, high dynamics, and a captivating design that commands attention, this double mono class-A amp ensures a dynamic performance and an awe-inspiring experience with every switch flick. The Deimos achieves a controlled and balanced sound across lows, mids, and Treble.

Instrumental clarity, both foreground and background, is exceptionally precise, revealing even the subtlest details hidden in the mix. Compatible with dynamic and planar-magnetic headphones, the Deimos is crafted with the sole purpose of providing a truly immersive musical experience. We believe purists will concur – this premium amplifier delivers stellar audio quality, making it a standout choice for audiophiles.

Elevating Excellence in Premium Amplification

In their pursuit of excellence, the team at Erzetich aimed to surpass previous benchmarks and create an outstanding premium amplifier with distinctiveness in electronics, sound, and design. The project, initially labeled POS (Perfidus on Steroids), perfectly captures the Deimos’s formidable and powerful performance.

A pivotal shift in their development approach was the emphasis on creating more internal space within the chassis, driven by various technical considerations. The visually striking design features a sleek aluminum and tinplate chassis that complements the powerhouse within.

While the analog core draws inspiration from the Perfidus design, it underwent enhancements, tweaks, and upgrades. The addition of a digital volume control and linear display brought a touch of 21st-century sophistication. Integrating digital and analog elements presented unforeseen challenges, but the team is pleased with the exceptional end results. As an amplifier more formidable than Perfidus, Deimos truly lives up to its name.

Technical Specifications

• Headphone impedance: 8-600 ohm
• Frequency response: 4 Hz-40 kHz, -1dB
• Power consumption: 15 W
• Power supply input voltage: 230 V/50 Hz or 115 V/60 Hz
• Dimensions (W x H x D): 320 mm x 125 mm x 330 mm
• Weight: 6200 g
• Character: Natural and wide with a fast note

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The formidable Perfidus stands as a solid-state class-A headphone amp, poised to captivate. Crafted within a sleek aluminum chassis, this desktop powerhouse, though tamed, unleashes a punchy, flat frequency response spanning 4 Hz to 40 kHz. Compatible with all headphones, including orthodynamic, it reveals intricate details with finesse.

Undoubtedly, the Perfidus elevates musical experiences to unprecedented heights. With remarkable resolution, responsive speed, and high dynamics, this boutique amplifier not only extracts warm tones but also bites down to emphasize the lower midrange with pristine clarity. Resulting in a sonorous richness, the Perfidus transports you to the sensation of live performances, whether it be the energy of rock bands or the grandeur of classical orchestras in the comfort of your living room.

In the initial stages, the unit was named In-Cubus, intended for a cube-like chassis with the power supply at the top and the amplifier circuit at the bottom. However, despite efforts to address electro-magnetic interference, the plan proved impractical. The solution? A switch to Plan B, placing it in the Bacillus chassis and slightly extending its length.

The switch proved successful, resulting in a precise and uncompromising amplifier, adept at revealing even the minutest details in recordings. Given its ability to expose imperfections, the name Perfidus emerged, maintaining a contextual link to the original name, In-Cubus.

Perfidus stands as our most intricate project to date. Similar to Bacillus, the goal was to fit it into the smallest chassis possible, making adjustments a meticulous process. The elongated casing features a 7mm aluminum front panel with a robust volume knob, headphone jack, and LED light. At the rear, you’ll find a pair of solid RCA connectors and the power switch. The 2mm thick aluminum rear panel rests on sturdy rubber feet, ensuring a sleek and stable design.

Technical Specifications

• Headphone impedance: 8-600 ohm
• Frequency response: 4 Hz-40 kHz, -1dB
• THD (1 kHz): 0.007 %
• IMD: 0.077 %
• Power consumption: 15 W
• Power supply input voltage: 230 V/50 Hz or 115 V/60 Hz
• Dimensions (W x H x D): 110 mm x 64 mm x 285 mm
• Weight: 1480 g
• Character: Bright and quick

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Experience the Bacillus Tilia, a headphone amp that defies its affordable price. Featuring premium input capacitors and op-amps, it unveils an unprecedented clarity. Crafted from linden wood, the Tilia delivers a rich, warm, and detailed sound. Versatile with any impedance headphones, it ensures a smooth, dynamic experience, capturing subtle nuances often missed by other amps. Elevate your audio journey with Bacillus Tilia – where affordability meets exceptional quality.

When the Tilia project was initiated, the objective was to create a distinct Bacillus variant with enhanced electronic specifications, promising more verve and clarity. Utilizing available linden wood, known for its significance in Slovenian art, the team conducted experiments to harness its dynamic qualities. Bacillus Tilia serves as a homage to Slovenian heritage, symbolized by the linden tree.

Inspired by the vision of listeners in an antique study surrounded by books, the design features an artificially aged, dark wooden chassis, radiating sophistication. The front panel, resembling a vintage concert piano, maintains the classic Bacillus style.

Grounded in the original Bacillus technology, Tilia boasts improvements in chassis, top-tier input capacitors, and op-amps. What sets Bacillus Tilia apart is its individually hand-carved chassis, painted with seven coats of four varnishes, creating distinctive patterns for each unit.

Technical Specifications

• Headphone impedance: 8-600 ohm
• Output power: 181.5 mW (8 ohm)/161 mW (600 ohm)
• Frequency response: 3 Hz-500 kHz, -1dB
• THD (1 kHz): 0.0002 %
• IMD: 0.034 %
• Power consumption: > 3 W
• SNR: >104 dB
• Power supply input voltage: 230 V/50 Hz or 115 V/60 Hz
• Dimensions (W x H x D): 130 mm x 90 mm x 160 mm
• Weight: 1150 g
• Character: Silky neutral, slightly warm

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The ACRO CA1000T completes your dream head-fi audio system, providing an authentic Astell&Kern sound experience. Its features include a dual-tube applied Triple Amp System, four levels of gain suitable for detailed IEMs and demanding headphones, and ESS Technology’s flagship ES9039MPRO Dual-DAC for exceptional audio performance.

Comprehensive Head-Fi Audio Solution: ACRO CA1000T

• Featuring the groundbreaking ES9039MPRO Dual-DAC for the inaugural time
• Effortlessly power a wide range of headphones/IEMs with 4 selectable gain levels and a remarkable 15Vrms output
• Incorporating a Triple Amp System with a dual-vacuum tube to offer a Hybrid sound experience
• Diverse input and output options ensure extensive connectivity and compatibility
• Designed with a built-in battery, enhancing portability and delivering optimal power performance

Excellence in Head-Fi Sound

The ACRO CA1000T transcends the constraints of a conventional headphone amp by offering an ideal Head-Fi audio system that can be set up anywhere and operates autonomously through its internal battery supply.

Featuring a built-in high-power headphone amplifier, the ACRO CA1000T delivers intricate headphone sound without the need for external connections to other devices. As an all-in-one Head-Fi audio system, it ensures excellent connectivity with external audio devices and speakers through a versatile array of input/output ports. This enables seamless enjoyment of network audio playback and music streaming, providing a comprehensive and convenient audio solution.

Versatile Connectivity Options

The ACRO CA1000T offers an extensive range of input/output options that can meet the needs of audiophiles looking to build their ideal Head-Fi system with maximum utility.
For greater ease of use, you can change the input/output settings using the touch screen on top of the product while multiple cables and devices are connected.

TERATON ALPHA, The Essence of AK Audio Technologies

TERATON ALPHA stands as the quintessence of Astell&Kern’s audio technologies, embodying the pinnacle of their audio engineering prowess.

This cutting-edge technology represents a significant advancement in audio processing. TERATON ALPHA aims to deliver an unparalleled audio experience, characterized by pristine sound reproduction, enhanced clarity, and a heightened sense of musical detail.

As the cornerstone of AK’s audio innovations, TERATON ALPHA reflects the brand’s commitment to pushing the boundaries of audio excellence. It is designed to extract the maximum potential from high-quality sound sources, providing audiophiles with an immersive and true-to-life listening experience. In essence, TERATON ALPHA represents the culmination of Astell&Kern’s dedication to advancing audio technologies and setting new standards in the world of high-fidelity sound.

4 Gain Stages And an output power of up to 15Vrms for the perfect Head-Fi Setup

The ACRO CA1000T sets the stage for the perfect Head-Fi setup with its 4-level gain options and an impressive up to 15Vrms output. Achieving an ideal match between the source and the receiving device is crucial for delivering impeccable sound, especially when dealing with intricate IEMs and demanding headphones.

This audio powerhouse supports four gain levels, enabling users to tailor the output to the specific characteristics and sound profiles of their headphones. The flexibility of these gain settings allows for precise adjustments, ensuring an optimal and customized volume output. With a robust up to 15 Vrms output, it effortlessly handles high-impedance headphones with grace.

Enhancements to the electrical capacity of the output ports add stability when accommodating devices with varying impedances at different gain levels. The separate controls for balanced and unbalanced volumes optimize electricity flow, effectively minimizing noise and maximizing sound quality.

In the realm of audio perfection, the ACRO CA1000T promises an immersive experience, delivering optimal device performance and pure, soul-stirring sound.

Complete Balanced Circuit with Dual-Tube Design

Incorporating dual Twin Triode KORG Nutube tubes, a technology initially introduced in AK’s award-winning SP2000T, the ACRO CA1000T delivers an advanced tube sound experience.

In cases where a product is equipped with a Dual DAC and a single vacuum tube, a distinct circuit becomes necessary to convert the signal to a balanced state just before reaching the output terminal. This configuration involves a process to transform an unbalanced signal into a balanced one, a step during which noise may be amplified.
In contrast, the CA1000T features a fully balanced circuit, utilizing two vacuum tubes to independently separate the left and right channels, resulting in more natural and smoother audio tones.

Whether in Tube AMP mode or OPAMP, both modes deliver a robust 15 Vrms output, while the headphone ports provide an opportunity to savor the distinctive tones of vacuum tubes without any restrictions.

TRIPLE AMP SYSTEM: The Evolution in AMP Technology

The ACRO CA1000T goes beyond conventional AMP Mode selection based on music genres. Choose from TUBE AMP mode, OP AMP mode, or the innovative HYBRID AMP mode.

OP AMP mode leverages Astell&Kern’s AMP technology expertise, delivering exceptional clarity and dynamic sound. TUBE AMP mode, on the other hand, imparts a distinctively warm and musical audio signature.

Introducing a pioneering feature for digital audio players, the HYBRID AMP mode elevates the resolution and clarity of the existing TUBE AMP mode, revealing intricate musical details. By blending the benefits of retro analog performance with high-resolution output, HYBRID AMP mode introduces a novel tonal characteristic, providing a unique auditory experience.

Explore the unparalleled sound enhancements offered by this advanced AMP technology. The TRIPLE AMP SYSTEM in the ACRO CA1000T sets a new standard for audio amplification, allowing you to tailor your listening experience to your preferences.

Tailored Design for Microphonic Noise Reduction

The ACRO CA1000T features a specialized custom design crafted to minimize microphonic noise originating from external shocks and vibrations.

In addressing the inherent structural challenge of vacuum tubes, susceptible to generating microphonic noise even from the slightest shocks or vibrations, AK has engaged in iterative design development. Rigorous testing and prototyping led to a solution where both sides of the vacuum tube are securely enveloped in flexible silicon covers. This design minimizes the impact of shocks, and a magnetic force is strategically employed to physically isolate the tube from the PCB. The result is enhanced stability and isolation, ensuring optimal performance when the tube is in operation.

Astell&Kern remains dedicated to meticulously designing these minute elements and nuances that sets their products apart, contributing to the unparalleled distinction in sound compared to competitors.

ASTELL & KERN ACRO CA1000 Specifications

• Frequency Response
• ±0.031dB (Condition : 20Hz~20kHz) Unbalanced / ±0.029dB (Condition : 20Hz~20kHz) Balanced /
• ±0.033dB (Condition : 20Hz~20kHz) RCA / ±0.002dB (Condition : 20Hz~20kHz) XLR
• ±0.079dB (Condition : 20Hz~70kHz) Unbalanced / ±0.029dB (Condition : 20Hz~70kHz) Balanced /
• ±0.080dB (Condition : 20Hz~70kHz) RCA / ±0.008dB (Condition : 20Hz~70kHz) XLR
• S/N 108dB @ 1kHz, Unbalanced / 112dB @ 1kHz, Balanced / 121dB @ 1kHz, RCA / 128dB @ 1kHz, XLR
• Crosstalk -115dB @ 1kHz, Unbalanced / -112dB @ 1kHz, Balanced / -138dB @ 1kHz, RCA / -145dB @ 1kHz, XLR
• THD+N 0.004% @ 1kHz, Unbalanced / 0.002% @ 1kHz, Balanced / 0.0005% @ 1kHz, RCA / 0.0003% @ 1kHz, XLR
• IMD SMPTE 0.0007% 800Hz 10kHz (4:1) Unbalanced / 0.0007% 800Hz 10kHz (4:1) Balanced /0.0007% 800Hz 10kHz (4:1) RCA / /0.0007% 800Hz 10kHz (4:1) XLR
• Output Impedance 3.5mm, 6.35mm (1ohm) / 2.5mm, 4.4mm (2ohm) / RCA (4ohm) / XLR (9ohm)
• Clock Jitter 25ps (Typ)
• Reference Clock Jitter 70ps
• Memory 256GB
• External Memory microSD x1 (Max. 1TB)

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EVOlution never ends

The Feliks Euforia EVO, Feliks’ new flagship headphone amplifier, represents the ultimate achievement in OTL technology. Based on the inner workings of the Euphoria Anniversary Edition, it has been extended and redesigned with an XLR output.

The Evo is smooth, neutral and dynamic, utilizing UPOCC cabling and premium components for a point-to-point design. The Feliks Euforia EVO is the ideal complement for dynamic and most planar-magnetic headphones.

A masterfully handcrafted OTL amplifier, the EVO utilizes two PsVane CV-181 Mk2 “Gold” driver tubes and two 6N13S power tubes, ensuring an impressive dynamic range and soundstage. The unique design of the Euforia EVO enables exceptional sound quality with a wide range of headphones and provides sufficient power for both demanding headphones and those with low impedance (<32Ω).

• Perfect tuning with dynamic headphones and most planars
• XLR and RCA headphone outputs
• Smooth, neutral and dynamic: UPOCC cabling, high-quality components, point-to-point design
• Tube protection cage (optional accessory, +100€)

Technical Specifications

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