Fidelix FRT-120K (Pamina) Ribbon Type Super Tweeter

Bringing a new sense of atmosphere and dimension to music

The FRT-120K (nickname: Pamina) is a ribbon-shaped super tweeter developed with a thorough design philosophy to bring out natural harmonics and airiness. It supports ultra-wideband playback from 4kHz to 120kHz and 150kHz at ±10dB, dramatically increasing the breadth and transparency of the sound field not only on high-resolution sound sources, but also on analog discs and CDs.

Ribbon diaphragm and transformerless structure

After comparing and measuring numerous tweeters, the method with thin, vertical diaphragm that showed the best characteristics was the one with a thin, vertical diaphragm. The entire diaphragm moves back and forth at the same time, so there is no need to increase rigidity, and lightweight films and foils can be used. This structure results in an extremely small mass and dramatically improved responsiveness and frequency response. In addition, although it is ribbon-shaped, it adopts a transformerless structure to thoroughly eliminate signal loss. It brings out the delicate and speedy sound unique to ribbons.

Carefully selected parts and cabinets

The parts used are carefully selected with sound quality as the top priority. PPS film is used for the capacitor, and a hollow core type is used for the coil, which is fixed with varnished Litz wire. The use of polyethylene-coated oxygen-free copper wire for the wiring material and non-magnetic material for the terminals ensures maximum signal purity. The cabinet is made of bubinga wood, which combines weight and hardness, and achieves both a musical instrument-like texture and suppression of unnecessary resonance. All are choices for a more natural and resonant sound.

Precision pairing and sound appeal

The FRT-120K is supplied with the best pairing with rigorous measurement and characteristic matching prior to shipment. As a result, the left and right playback characteristics are aligned, and music playback is possible beyond the role of a super tweeter. The addition of this tweeter brings the overtones of string instruments, vocal sighs, and even the sound of the hall to life, creating a sense of life and depth in the music.

A machine that evolves the system

The FRT-120K not only brings out the charm of high-resolution audio and SACD, but also delivers excellent performance in analog disc playback. This super tweeter is highly recommended for those seeking natural extension and airiness in the high frequencies.

Transparency of Ultra-High Frequencies and Soundstage Expression

• The moment I added the super tweeter, I was strongly impressed with the sense that “the soundstage has expanded upwards.” The FRT-120K naturally complements ultra-high frequencies beyond the audible range, instantly enriching the sense of air and reverberation, dramatically increasing the dimensionality and depth of the soundstage. It feels as if the space itself has expanded.
  
• The extension of the high frequencies is smooth, and the freshness of the sound is significantly improved. Thanks to the light diaphragm typical of ribbon types, fine details become distinct, further enhancing the overall transparency of the music.
  

Compatibility and Integration with Existing Systems

• The connection with the main speakers is surprisingly natural, with no sense of the super tweeter standing out awkwardly. Due to its excellent phase characteristics, it blends smoothly with the existing high frequencies, making the entire system sound like a cohesive whole.
  
• Interestingly, as the ultra-high frequencies are refined, it also seems to improve the tightness and resolution of the low frequencies. Improvements beyond the audible range appear to positively affect the overall balance.
  

Quality and Usability

• Installation and adjustment are relatively simple, and the effects can be felt immediately after setup, which is a nice feature.
  The more detailed the adjustments, the more noticeable the changes in sound, making the tuning process enjoyable.
  
• The beautiful design unique to ribbon units is another attraction, offering a sense of pride in ownership.