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Authorized dealers for Fosi Audio Fosi Audio Box X5 Phono Preamplifier

  • Acoustic Technologies — online and in-store — Montréal, Québec, Canada (website)
  • Altitudo Audio — online and in-store — Winnipeg, Manitoba, Canada (website)
  • Apos Audio — online and in-store — Oakland, California, United States (website)
  • Audeos — online and in-store — Żywiec, Województwo śląskie (website)
  • Audio 46 — online and in-store — New York, New York, United States (website)
  • Audio Domain — in-store — Stadtbezirke I, Nordrhein-Westfalen, Germany (website)
  • Audio Magic - EU — online and in-store — Wola, Województwo mazowieckie, Poland (website)
  • AUDIOPHONICS — in-store — Bordeaux, Nouvelle-Aquitaine, France (website)
  • AV Cables — online and in-store — Hornsyld, Denmark (website)
  • B&H Photo — online and in-store — New York, New York, United States (website)

and 12 more verified dealers

Fosi Audio Fosi Audio Box X5 Phono Preamplifier #1
Fosi Audio Fosi Audio Box X5 Phono Preamplifier variant 1
Fosi Audio Fosi Audio Box X5 Phono Preamplifier variant 2
Fosi Audio Fosi Audio Box X5 Phono Preamplifier variant 3
Fosi Audio Fosi Audio Box X5 Phono Preamplifier variant 4
Fosi Audio Fosi Audio Box X5 Phono Preamplifier variant 5
Fosi Audio Fosi Audio Box X5 Phono Preamplifier variant 6
Fosi Audio Fosi Audio Box X5 Phono Preamplifier variant 7
Fosi Audio Fosi Audio Box X5 Phono Preamplifier variant 8
Fosi Audio Fosi Audio Box X5 Phono Preamplifier variant 9

Fosi Audio Fosi Audio Box X5 Phono Preamplifier

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View at Fosi Audio
MC/MM Switching
Gain Switching
  • MM & MC Cartridge Compatibility
  • 4 Gain Settings: 38-66dB
  • Precision Audiophile Components
  • Aluminum Alloy Chassis
  • One-Touch Power & Cartridge Switch

MM & MC Cartridges Support


Fosi Audio BOX X5 Mini Phono Preamp

It supports MM and MC cartridges,
provides 4-level gain adjustment, and provides RIAA equalization accuracy.


Embracethe Vintage Charm of Vinyl with Modern Precision

Supporting MM/MC cartridges, BOX X5 is compatible with most turntables, along with 4 adjustable gain levels of 38/48/56/66 dB. It utilizes high-precision capacitors and resistors, ensuring minimal noise for audio purity. Intuitive RCA terminals achieve a plug-and-play experience.


  • Input: MM/MC RCA; Output: RCASNR≥92dB; THD≤0.009%
  • Frequency Response: 20Hz-20kHz(±0.015dB)

Accurate RIAA Equalization

Ensuring clarity and detail in every note for a rich listening experience.


Audiophile-Grade Components

Carefully selected top-tier components are dedicated to crafting extraordinary sound quality.


Connection and Usage Diagram

Plug-and-play convenience, ensuring optimal performance for easy setup.


Swappable Op-Amp Design

Replace with DIP8 dual discrete op-amps, meeting your pursuit of a personalized audio experience.


  • High Performance: The BOX X5 phono preamp is compatible with both MM and MC cartridges, featuring 4 gain settings and an excellent precise RIAA equalization to provide a clean, direct pass-through of a signal when paired with your turntable
  • Audiophile-Grade Components: This preamp utilizes a variety of materials such as 2% Precision Polyester Film Capacitors, Green Sleeve Copper Lead Audio Capacitors, 0.1% High-Precision Film Resistors, OPA1612 Op-Amp, Gold-Plated RCA Jacks, and more. It picks up subtle and finite detail produced from it and delivers a truly warm and inviting sound
  • Multiple Gain Settings: With 4-Level gain adjustment Asettings of 38/48/56/66dB, the preamplifier accommodates both MM & MC cartridge types, meeting a variety of needs. This enhances your phono stage and helps in rebuilding the vintage stereo sound
  • Mini and Exquisite: It's built around a minimalist yet functional design featuring an all-aluminum alloy chassis. When paired with the V3 stereo amplifier, the BOX X5 can bring out the best in your vinyl playback, enhancing its frequency response and dynamic performance
  • User Friendly Design: It has an easy-to-use one-touch power button, gain control, and a convenient toggle switch to switch between MC and MM cartridges. In addition, the grounding port ensures that the connection is secure
  • BОX X5 Phono Preamp x 1
  • 16V 1A Power Adapter x 1
  • User’s Manual x 1

The BOX X5 is powered by its supplied AC adapter, not a DC power supply. DC power supply filters cannot be used for AC power supply.


Dealers selling Fosi Audio near you

Authorized dealers for Fosi Audio Fosi Audio Box X5 Phono Preamplifier

and 12 more verified dealers

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