Fyne Audio S-Trax (pack of 2)

The S-Trax from Fyne Audio is a super tweeter equipped with a 25 mm magnesium dome and an omnidirectional dispersion design. It extends a hi-fi system’s frequency response up to 50 kHz. Designed to match Fyne Audio speakers, notably the F500 series, it aims to improve spatial continuity and high-frequency reproduction. Its high-pass filter set at 16 kHz and level control allow adjustment to suit the listening setup.

Design and physical architecture

The S-Trax stands out with its compact 79 x 82 x 149 mm enclosure weighing 1 kg. Its satin black finish blends discreetly into existing setups. The chassis houses a 25 mm magnesium dome transducer, a material chosen for its rigidity and lightness. The neodymium magnet generates a powerful magnetic field in a compact volume, allowing precise control of diaphragm movement.

The S-Trax’s omnidirectional geometry is its defining feature. Unlike conventional front-radiating tweeters, this design propagates high frequencies in all directions, creating a more uniform sound field in the listening room. This approach promotes spatial coherence and reduces timbre variations depending on listening position. The tweeter can be positioned on top of a floorstanding speaker or near a pair of bookshelf speakers.

Signal processing and filtering

The integrated crossover uses a third-order high-pass filter at 16 kHz. This high crossover point allows the S-Trax to handle only the extreme treble, leaving lower frequencies to the speakers’ main tweeters. The CryoLite treatment applied to the crossover components aims to improve electrical conductivity and reduce micro-distortions. This cryogenic process gradually cools electronic elements to extreme temperatures, altering their crystalline structure.

A rotary potentiometer on the rear panel offers a ±4.5 dB adjustment range around the nominal level. This flexibility allows tuning of tonal balance according to personal preferences, room acoustics, or the characteristics of the main speakers. The nominal impedance of 8 ohms ensures compatibility with most amplifiers, with a maximum power handling of 400 watts RMS.

Frequency range and sound reproduction

The S-Trax’s bandwidth extends from 16 kHz to 50 kHz with a -6 dB cutoff point. This extension beyond the theoretical limit of human hearing (around 20 kHz) is debated in the audio community. Some listeners report improved transparency and spatialization, potentially linked to harmonic interactions and reduced phase distortion in the upper audible spectrum.

The S-Trax’s sensitivity suits speakers reaching 98 dB, ensuring level balance with relatively efficient systems. Adding this super tweeter can alter the perception of cymbals, violin harmonics, and acoustic ambience. Fast transients particularly benefit from the lightness of the magnesium dome, which responds quickly to signal variations.

Integration into an audio system

The S-Trax connects in parallel with the main speakers via binding posts located on the back of the enclosure. Simple wiring requires no modification to the existing system. For Fyne Audio’s F500E, F500S and F500SP series, the super tweeter naturally complements IsoFlare technology, forming continuity with the coaxial drivers in these models.

Physical placement significantly influences the sonic result. A higher position, above the main speakers, generally enhances the perceived height and openness of the soundstage. The S-Trax’s omnidirectional nature offers some tolerance to exact placement, although vertical alignment with the other drivers remains preferable to maintain temporal coherence.

Pairing with speakers from other brands requires a phase of adjusting the level potentiometer. Start with the control at minimum and increase gradually while listening to material rich in high-frequency harmonics. Excessive level manifests as artificial brightness or listening fatigue, while too little level renders the super tweeter ineffective.

Frequently Asked Questions

Can I use the S-Trax with any hi-fi speaker?

The S-Trax works with most speakers with sensitivity up to 98 dB. The 16 kHz filtering ensures it doesn’t interfere with existing tweeters. However, the effect will be more noticeable with mid- to high-quality speakers; entry-level systems may not reveal the nuances brought by the extended frequency range.

How do I correctly set the super tweeter level?

Start with the potentiometer at minimum. Play a familiar track rich in cymbals or high-pitched instruments. Gradually increase the level until you perceive improved definition without exaggerated treble. If voices become sibilant or cymbals too prominent, reduce slightly. The optimal setting depends on your setup and preferences.

Does the CryoLite treatment make an audible difference?

The cryogenic treatment of the crossover components aims to reduce micro-distortions and improve conductivity. The effect remains subtle and is hard to isolate from the S-Trax’s other characteristics. This technique reflects an overall commitment to build quality rather than a radical change in sound.

Do I need two S-Trax units for a stereo setup?

Yes, to maintain symmetry and coherence of the stereo image, you need one super tweeter per channel. Using a single S-Trax would create a tonal imbalance between left and right channels, undermining precise localization of sound sources.

What’s the difference between the S-Trax and ribbon tweeters?

The S-Trax uses a magnesium dome, whereas ribbon tweeters employ a thin conductive membrane. Ribbons generally offer a larger radiating surface and restricted vertical dispersion, while the S-Trax’s dome radiates omnidirectionally. Both technologies aim for extended frequency response, but with distinct sonic signatures.

Does the S-Trax require a power supply?

No, the S-Trax is a passive transducer powered directly by the amplifier via the speaker terminals. No mains power is required, simplifying installation and avoiding electrical noise issues.

Technical specifications

Transducer and technology

• Speaker type: 25 mm magnesium dome with neodymium magnet
• Design: time-aligned omnidirectional design
• Filtering: 3rd-order high-pass filter at 16 kHz with CryoLite treatment

Acoustic performance

• Frequency response: 16 kHz to 50 kHz (-6 dB measurement, typical in-room)
• Sensitivity: compatible with speakers up to 98 dB (2.83 V / 1 m)
• Level adjustment: ± 4.5 dB from nominal setting

Electrical characteristics

• Nominal impedance: 8 ohms
• Recommended amplification power: up to 400 W RMS (maximum)

Dimensions and finish

• Dimensions: 79 x 82 x 149 mm (height x width x depth)
• Net weight: 1 kg
• Available finish: satin black

Compatibility and integration

• Optimal compatibility: F500E, F500S, F500SP series equipped with IsoFlare technology
• Universal compatibility: easily integrates with most hi-fi speakers
• Recommended use: high-end hi-fi systems and home theater

General information

The high-frequency super tweeter combines a time-aligned omnidirectional design with a 25 mm magnesium dome transducer featuring a neodymium magnet. This SuperTrax-derived technology delivers extreme extension of the sound spectrum up to 50 kHz for ultra-detailed reproduction of high frequencies.

The premium construction incorporates CryoLite filtering and allows a customizable adjustment of ± 4.5 dB to suit any system. The omnidirectional design ensures better dispersion and optimal spatial coherence.

Ideal for listeners seeking greater clarity, presence, and air in the treble, this super tweeter pairs perfectly with Fyne Audio F500 series speakers and guarantees exceptional tonal accuracy and naturalness.