87%
Fosi Audio Fosi Audio Box X5 Phono Preamplifier
- 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.
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Professional Reviews 87/100
Nicely Roasted
Sound Quality
85/100
Cartridge Compatibility
88/100
Build Quality
87/100
Value for Money
91/100
The Fosi Audio Box X5 brings a clean, solid vinyl presentation with a pleasingly analog-leaning warmth, making built-in turntable stages feel like a clear step down. United States of Analog highlights its sturdy metal build, MM/MC flexibility, and four gain settings, creating a compact, capable hub for cartridges that deserve more than entry-level amplification.
What Reviewers Are Saying
Pros
Clean, solid sound with an agreeable warmish, analog-leaning character rather than an overly analytical balance.
Broad cartridge compatibility via MM/MC support and four gain settings from 38dB to 66dB.
Sturdy, sleek metal construction and a tidy rear-panel control layout.
&
Cons
Lacks the extensive loading and fine-tuning controls available on more adjustable phono stages.
No low-rumble filter for addressing turntable-borne low-frequency vibration.
SOUND QUALITY PERFORMANCE 85/100
The available review finds the Box X5 clean, solid and more naturally “warmish” than analytical. It is presented as a meaningful upgrade for an entry-level turntable system, although the reviewer provides little direct discussion of transient impact or stereo imaging.
Transparency Noise Floor
88/100
The reviewer describes the sound as “very clean” and solid, with no reported hum, hiss, or interference. There is no detailed comparison of background silence or low-level resolution with competing phono stages.
Tonal Balance Musicality
89/100
Its character is described as analog and “warmish,” rather than as overtly analytical like a Zen Phono. The reviewer finds this presentation agreeable and says it works very well in the system used.
Dynamics
82/100
The reviewer says the preamp can help a system tremendously and sounds solid, suggesting an engaging overall presentation. There is little specific commentary on macrodynamic punch, microdynamic nuance, or transient speed.
Soundstage Imaging
82/100
No direct claims are made about soundstage width, image focus, layering, or depth. The review’s positive overall listening impressions do not establish its spatial performance in detail.
Assessments of Build Quality, Usability, and Overall Propositions.
Cartridge Compatibility
88/100
The Box X5 supports both MM and MC cartridges, with four gain choices—38, 48, 56, and 66dB—and includes a grounding terminal. That makes it suitable for a broad selection of common cartridges, though the reviewer notes that it lacks the more extensive cartridge-loading adjustments offered by some alternatives.
Build Quality
87/100
The reviewer calls it a nice, sturdy phono preamp and likes the clean rear-panel placement of the controls. The layout includes separate MM/MC selection, gain switching, RCA connections, grounding provision, and the supplied 16V power supply.
Value for Money
91/100
At its roughly $109 asking price, the review treats the Box X5 as a highly compelling first audiophile-oriented upgrade, calling it sturdy and great sounding for the money. Its MM/MC support and useful gain range strengthen its appeal against basic entry-level phono stages, while the absence of fine loading adjustments and a rumble filter leaves some room for better-equipped rivals.
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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 — online and 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 13 more verified dealers