Bi10 (Fujitsu Ten) (1985)

 

The Bi10 D Series by Fujitsu Ten represents a sophisticated fusion of sound and design, engineered specifically for the unique acoustic environment of the automobile. Developed with a driver-focused philosophy, the Bi10 system combines advanced audio technology, intelligent functionality, and refined aesthetics to deliver a premium in-car listening experience. Every component in the Bi10 D Series is designed to work in perfect synergy, creating powerful, high-quality sound throughout the vehicle interior. From the auto-reverse cassette deck with dual azimuth mechanism to the graphic equalizer featuring test tone functionality for precise sound field correction, each unit contributes to a balanced and immersive car audio system. The result is clear, dynamic, and accurate sound reproduction tailored to the challenges of automotive acoustics. The Bi10 D Series also introduced a distinctive visual identity with innovative 2-way illumination technology. Drivers could switch the panel lighting between green and orange, allowing the system to match different vehicle interiors and personal preferences. Illuminated indicators clearly display active functions and system status, combining style with enhanced usability and visibility. Powered by advanced microcontroller technology, the Bi10 D Series offers smoother operation, faster tuner response, simplified equalizer controls, and safer usability while driving. Every detail has been designed with the driver in mind, ensuring intuitive control without distraction. Unlike conventional home audio systems, car audio must overcome limited cabin space, changing passenger conditions, vibrations, and sound-absorbing materials such as seats and carpets. The Bi10 D Series was created from the perspective of the car itself, delivering an audio solution specifically engineered for the mobile environment. Combining technical innovation, system expandability, elegant styling, and seamless integration with the vehicle, the Bi10 D Series reflects a new era of automotive sound engineering from Fujitsu Ten. System components are: QD-580 cassette deck (65.800 Yen), QT-580 FM Stereo tuner (46.800 Yen), QE-580 equalizer (49.000 Yen), QM-570 25W/ch amplifier (29.000 Yen), SD-1100 CD player (94.000 Yen), Z701 4-way speaker system (70.000 Yen)

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YAMAHA AST-C30 (1989) | Tiffany Excellence

 

The Tiffany Excellence AST-C30 from 1989, with its fresh form, exudes elegance that refreshes even the impression of the music itself. A fresh, rounded form made possible only by Yamaha Active Servo Technology and long time time design partner GK Design. Furthermore, the clear mid-to-high frequencies are achieved through the refinement of sound quality using a 12cm PP cone midrange driver and a 2cm soft dome tweeter. A special Tiffany Excellence for those seeking high grade and elegance. Moreover, the design prioritizes sound quality from an audio perspective, with the midrange and tweeter placed in separate boxes and the woofer positioned externally, truly embodying functional beauty. It's a highly sophisticated design that won a Grand Prize in its category at the Good Design Awards. (1989 Good Design Award Section Grand Prize (Japan Institute of Design Promotion). Of course, thanks to Yamaha Active Servo Technology (developed in cooperation with Sharp), the high-quality new deep bass and clear sound remain unequalled. The AST-C30 is a special model for discerning individuals who demand more from music. Its unique form asserts its presence without being lost in the interior, while also possessing a beauty that considers total coordination. A handsome design that caters to a fresh aesthetic sense, one step ahead of the times. The Tiffany Excellence AST-C30 is a beautiful instrument for music, excellently enhancing a high-class and elegant room. Specifications: 50W+50W | Main unit size 300x268x294mm | Weight 8kg | Speaker size 324x232x232mm | Weight 4,3kg | Original sale price in Japan: 178,000 yen (with remote control, excluding tax)

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DIATONE DA-U750 (1975)

 

The Diatone DA-U750, released by Mitsubishi in 1975, was one of the company’s top integrated amplifier and one of the finest examples of 1970s Japanese amplifier engineering. Although Diatone is best known for its loudspeakers, the DA-U750 demonstrated the brand’s serious commitment to high-end amplifier design, incorporating technology later used in the separate DA-P10 and DA-A10 series. One of its most distinctive features was the dual-block internal construction, with the preamplifier and power amplifier sections physically separated at the front and rear of the chassis. The power amplifier block was independently shielded to minimize heat and magnetic interference from the power supply, improving stability, reliability, and long-term performance. The fully direct-coupled pure complementary OCL power amplifier used carefully matched transistor pairs in both the driver and output stages to reduce distortion and preserve dynamic range, delivering 90W + 90W into 4Ω. The equalizer amplifier employed proprietary ultra-low-noise transistors developed using Mitsubishi’s low-concentration diffusion technology, achieving improved noise performance and excellent phono sensitivity. Diatone also designed the amplifier using simulated cartridges and speakers to optimize real-world dynamic performance rather than relying only on laboratory measurements. Additional features included precision tone and presence controls with selectable turnover frequencies, a high-accuracy 22-contact attenuator, multiple low-cut and high-cut filters, extensive input and tape dubbing facilities, and beautifully machined solid metalic knobs. Combining advanced engineering with luxurious construction, the DA-U750 remains one of the most respected vintage Diatone integrated amplifiers. Size (W/H/D) 425x148x387mm | Weight 17kg | Original sale price in Japan ¥ 98,800

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