S O N O C U S  THA-1 IS A HEADPHONE AMPLIFIER UNLIKE ANY OTHER. Its modular architecture allows it to become a fundamentally different amplifier with each module swap. THA1 is currently the only headphone amplifier in the world to offer this level of true transformability.

MODULAR OUTPUT:
This modular design—found throughout the Sonocus line—delivers major advantages: improved layout performance, superior noise suppression, easy serviceability, and most importantly, the ability to alter the amplifier’s sonic character and output parameters themselves.
In THA-1, the output stage is the amplifier. As a result, THA-1 is effectively many amplifiers in one, transformable through simple plug-and-play module changes.
Both a fully discrete module and a state-of-the-art composite module are available, with full CFA and buffer-type IEM modules currently in development. The discrete module offers a natural, slightly warm presentation, while the composite module functions as a true wire-with-gain, featuring vanishingly low distortion and pure Class-A output.
Simple, versatile, and immensely enjoyable—this is THA-1.

TRIPLE STAGE PSU FILTERING:
All modules are powered by our TFDM PSU board, an engineering achievement in its own right. Unlike conventional headphone amplifiers that rely on single regulators or passive filtering, THA-1 employs a triple-filtered power supply: an active choke stage followed by two composite regulators.
This design achieves an exceptional PSRR of up to –120 dB, far exceeding the 80 dB to 100 db nominal figure seen in even well-designed competitors. The result is a darker background, deeper and more controlled bass, and a midrange and treble that are effortlessly refined.

DUAL MONO:
THA-1 is built as a true dual-mono amplifier, with completely independent left and right circuitry from the AC transformer to the output. While this doubles cost and complexity, the gains in soundstage, separation, and distortion performance are unmistakable.
 

WORLD CLASS PCB DESIGN:
A design like this would mean nothing without a properly executed PCB. THA-1 features a true state-of-the-art layout, incorporating partitioned ground planes, curved traces, chassis bonding, ground shunting, and intelligent point-to-point component placement—techniques inspired by medical and RF equipment and rarely seen in consumer audio.

As experienced designers know, PCB layout can make or break an amplifier. Years of refinement and proven results stand behind THA-1, hum, ground loop, input noise are but memories of the past, and the sound is is natural, dynamic, and smooth, with unwavering instrument separation and spacious, airy definition.

PURPOSEFUL MINIMALISM:
THA-1 remains deliberately minimalist. Its only prominent user control is a split ground-plane toggle, enabling balanced headphones to operate in true dual-mono mode without the anti-phase output of conventional balanced designs.
This approach preserves THA-1’s remarkable value while delivering measured performance and sonic fidelity that rival the finest amplifiers in the world.

SPECS

Frequency Response

10 Hz – 100 kHz (+0 / −3 dB)

20 Hz – 20 kHz (+0 / −0.5 dB)

​

Total Harmonic Distortion (THD)

< 0.0003%

Interchannel Crosstalk

130 dB @ 1 kHz 110 dB @ 20 kHz

Input Sensitivity

300 mV input for 1 V output Gain 10 dB (switchable to 0 dB)

Maximum Output Level

0.5 WATT

Signal-to-Noise Ratio (S/N)

>120 dB (shorted, IHF A-weighted) >110 dB (shorted, unweighted)

Input Impedance

20 kΩ

Output Impedance

47 Ω

Mechanical Specifications

Width: 340mm

Depth: 215mm

Height: 64 mm

Net Weight

2.8 kg