Fosi Audio BOX X5 MM/MC Phono Preamplifier

Fosi Audio BOX X5 Moving Magnet & Moving Coil Cartridge Phono Preamp 

Overview

The Fosi Audio BOX X5 Phono Preamplifier is crafted for vinyl enthusiasts who want to hear their records exactly as the artist intended — detailed, dynamic, and full of musical warmth. Designed to work seamlessly with both moving-magnet (MM) and moving-coil (MC) cartridges, the BOX X5 delivers clean, natural sound across a wide range of turntable setups. Compact yet powerful, it embodies Fosi Audio’s design philosophy of audio purity made simple — a modern, high-fidelity phono stage that’s as elegant as it is musical.

At the heart of the Fosi BOX X5 phono preamp lies a pair of premium OPA1612 op-amps mounted in replaceable DIP-8 sockets, chosen for their low noise, ultra-low distortion, and wide dynamic range. These op-amps feed a precision RIAA equalisation circuit, engineered to preserve tonal balance and spatial depth while eliminating unwanted coloration. Every instrument, vocal, and transient detail is rendered with effortless clarity, from deep bass textures to shimmering treble extension.

The BOX X5 from Fosi provides four selectable gain settings (38 / 48 / 56 / 66 dB), allowing precise matching to any cartridge output level. Whether you’re using a high-output MM or a low-output MC design, gain can be fine-tuned to achieve the perfect listening balance without introducing unwanted noise. Combined with its switchable input impedance — 47 kΩ for MM and 100 Ω for MC — the BOX X5 phono-pre ensures ideal cartridge loading for optimal performance across your vinyl collection.

Fosi’s engineers focused heavily on noise control and component isolation. The circuit board uses a dual-mono layout within a solid aluminium chassis, providing exceptional channel separation and protection from electromagnetic interference. The result is a signal path that remains remarkably quiet, even at higher volumes, preserving the delicate nuances that make vinyl playback so engaging.

Visually, the BOX X5 follows Fosi Audio’s minimalist design language — compact, functional, and beautifully machined. The anodised aluminium front panel feels premium to the touch, while its clean layout makes operation intuitive. At just over 16 cm wide, it integrates easily into desktop setups, integrated systems, or full-size hi-fi racks, bringing true high-end vinyl sound to spaces where larger preamps simply won’t fit.

Connection is simple and flexible. The Fosi BOX X5 offers RCA input and output connections, compatible with virtually any turntable and amplifier combination. Power is supplied by an included 16 V AC external adapter, providing clean, consistent current for stable operation. Together, these details reflect Fosi’s focus on blending audiophile-grade circuitry with everyday practicality.

For Groove Central listeners, the Fosi Audio BOX X5 is more than a phono preamplifier — it’s a bridge between the analogue warmth of vinyl and the precision of modern engineering. It takes the raw beauty of your records and reveals them with newfound depth and realism, transforming the familiar into something extraordinary. Whether rediscovering old favourites or exploring new record pressings, the Fosi Audio BOX X5 ensures that every listening session feels personal, alive, and true to the music.

Key Features

• Compatible with both MM and MC cartridges, offering true flexibility for any turntable setup.

• Four selectable gain levels (38 / 48 / 56 / 66 dB) provide precise matching to cartridge output.

• Dual OPA1612 op-amps in DIP-8 sockets deliver ultra-low noise and high dynamic range.

• Accurate RIAA equalisation preserves tonal balance and musical integrity.

• Switchable input impedance (47 kΩ for MM / 100 Ω for MC) ensures proper cartridge loading.

• Exceptionally low distortion (≤ 0.009 %) and high SNR (≥ 92 dB) for clear, transparent sound.

• Compact CNC-machined aluminium chassis provides durability and superior shielding.

• Includes 16 V AC power supply for stable, low-noise operation.

Technical Stuff 

Fosi Audio BOX X5 MM/MC Preamp For Turntable - A Visual Introduction ... 

For More Information

Visit the manufacturer's website.

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