Features overview
1. Appearance characteristics
The EF-100 has a sophisticated appearance and is available in Elegant Gold, Azure Blue and Charming Red. The finely crafted all-aluminum alloy body, the panel adopts anodizing process and extremely fine sandblasting treatment, which will never fade; the elegant arc edge design is integrally formed, beautiful and elegant, and feels excellent.
2. Circuit and material design
EF-100 adopts the classic Class A power amplifier circuit and selects various high-quality components. Its digital audio decoding chip uses the top chip ADI1955 from American ADI Company, and its signal-to-noise ratio is as high as 123dB. The operational amplifier uses the high-end fever op amp OPA2134 from American TI Company, and the volume adjustment chip uses the top chip CS3310 from American Cirrus Logic Company. The chip combination is completely applied to the pre-stage of the high-end audio decoder. In addition, it also uses an audio DSP chip from Cirrus Logic for sound effect processing. It can not only use this DSP to design an all-pass filter to correct the phase distortion, but also use its design parameter EQ to correct the frequency response of the headphones and significantly improve the sound of the headphones. The materials and design of the EF-100's digital signal processing circuits are very high specification.
The headphone amplifier part adopts ultra-low distortion pure class-A circuit, and the materials used are also carefully selected. The front-stage differential pair tube and voltage amplifier stage are used Toshiba's 2SC2713/2SA1163 pair of high-performance transistors, which have been strictly screened. pair. The power driver uses Toshiba 2SC5171/2SA1930, and the signal coupling capacitor uses Japan's ELNA audio-specific capacitor.
3. Main functions
It is a high-quality media player: EF-100 supports both TF card and U disk playback. In terms of signal types, it not only supports compressed audio formats such as MP3, but also supports lossless high-quality music formats such as WAV and flac. The player uses Linux system programming, and uses the original code transparent transmission method to directly output the signal, completely avoiding the SRC system processing that damages the sound quality. For the convenience of use, the EF-100 adopts a TFT color display, which can completely display the song name and storage path. EF-100 has a complete file management system, supports storing and searching songs by folder, and supports more than 6 layers of folder nesting, which is very convenient to use and has an excellent user experience. Users can also add their favorite songs to the "My Favorites" collection at any time for centralized calling and playback.
It's also a top-of-the-line headphone amp: the EF-100 uses ultra-low distortion Hi-end circuitry, select high-quality components, and the headphone amp is built with discrete components to easily push any headphone to satisfy the most discerning audiophile. The following picture shows the circuit schematic diagram of the amplifier. It has the characteristics of ultra-low distortion and noise, round and warm sound, and is widely used in Tianyi high-fidelity amplifiers. The transistors used in the circuit have been strictly matched and screened, and adopted the pure class A working method most highly praised by enthusiasts. EF-100 has a strong driving force for earphones, and can match various earphones from 10Ω to 600Ω, and let them show the best sound effect.
It is also a high-quality computer external sound card: EF-100 has a USB-AUDIO interface, which can be connected to a PC (computer); it supports 96kHz/24bit high-quality USB digital audio transmission. This function is easy to use and free of drivers. It can be connected to the computer through an ordinary USB cable, and all kinds of music files in the computer can be played without loss, so that the computer can play the sound effect of a high-level CD player, and it can be directly connected to the computer. Headphones sound a world of difference.
It can be an advanced audio decoder pre-amp: EF-100 fully adopts the advanced Hi-Fi audio design scheme, so it can be used as an advanced audio decoder pre-amp to match the Hi-Fi power amplifier.
In short, the EF-100 has four important uses. First, it is a top Hi-end class A headphone amplifier that can easily drive any headphones and maximize the performance and tone of these headphones. Second, it's also a high-quality media player. Third, it is also a streaming media player, which supports wireless transmission function, and realizes online streaming media playback after connecting with various mobile devices through DLNA or Airplay. Fourth, it is also a high-end decoder pre-amp that can be matched with any post-amplifier.
4. Sound characteristics
The EF-100 has no over-rendered low frequencies or harsh high frequencies. Its sound is rich in details, distinct layers, wide range, pure and warm, beautiful and natural sound, and has a strong musical appeal. The music is expressive, the sound is well balanced, the positioning is accurate, the details are rich, the layers are clear, and the sound field is gorgeous and grand. The sound range is wide, the audio resolution is high, the vocals are clear, the background music is clean, and the sound is stereoscopic. As far as amps are concerned, the best evaluation is probably "not tired after listening for a long time", and this is the positioning of the EF-100.
