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Fosi Audio Box X5 Phono Preamp for Turntable, Mini Preamplifier Home Audio for MM & MC Cartridge Turntable/Phonograph Record Player/Active Speakers, 4-Level Adjustable Gain 38/48/56/66 dB with RCA
Sustainability features
Purchase options and add-ons
- 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(Input voltage 120V)
- 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 settings 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
Frequently bought together

Product information
Technical Details
| Brand | Fosi Audio |
|---|---|
| Manufacturer | Fosi Audio |
| Model | BOX X5 |
| Part Number | BOX X5 |
| Mounting Hardware | AC 16V Power Adapter x1, Fosi Audio BOX X5 Phono Preamp x1, User Manual x1 |
| Number of Items | 1 |
| Batteries included | No |
| Batteries Required | No |
| Manufacturer | Fosi Audio |
| Item model number | BOX X5 |
| Product Dimensions | 10.41 x 16.51 x 3.56 cm; 1.1 kg |
| ASIN | B0DLVZF5Y7 |
Additional Information
| Date First Available | Nov. 16 2024 |
|---|---|
| Customer Reviews |
4.4 out of 5 stars |
| 鶹 Rank |
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Sustainability features
This product has features recognized as more sustainable by certifying organizations.
Carbon emissions from the lifecycle of this product were measured, reduced and offset.
Product Description
Embrace the 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: RCA
- SNR≥92dB; THD≤0.009%
- Frequency Response: 20Hz-20kHz(±0.015dB)
- Power Adapter: AC 16V; Input voltage:120V
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Accurate RIAA Equalization
Ensuring clarity and detail in every note for a rich listening experience.
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Audiophile-Grade Components
Carefully selected top-tier components are dedicated to crafting extraordinary sound quality.
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Replace with DIP8 dual discrete op-amps, meeting your pursuit of a personalized audio experience.
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Connection and Usage Diagram
Plug-and-play convenience, ensuring optimal performance for easy setup.
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Is it mandatory to connect the turntable’s ground wire to the BOX X5’s ground terminal?
Grounding is recommended to avoid rattling during use.
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Can the BOX X5 be used as a regular preamp?
The BOX X5 is a phono preamp with a higher amplification gain than a regular preamp, thus it is not suitable for use as a standard preamp.
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How to power on and off to prevent any thumping sounds that could damage the equipment?
Power On: Turn on the turntable, then the BOX X5, followed by the amplifier.
Power Off: Turn off the amplifier, then the BOX X5, and finally the turntable.
Product Comparison
Box X5
Add to Cart
| Box X1
Add to Cart
| Box X2
Add to Cart
| Box X3 | Box X4
Add to Cart
| P2 | P3
Add to Cart
| |
|---|---|---|---|---|---|---|---|
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Customer Reviews
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4.4 out of 5 stars 157
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4.3 out of 5 stars 1,625
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4.5 out of 5 stars 2,971
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4.2 out of 5 stars 802
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4.2 out of 5 stars 481
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4.1 out of 5 stars 6
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Type
| Phono Preamp | Phono Preamp | Phono Preamp with Vacumm Tubes | Phono Preamp with Vacumm Tubes | Phono Preamp with Vacumm Tubes | Headphone Amp +Preamp | Headphone Amp +Preamp |
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MAX Power Output
| - | - | - | - | - | - | - |
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Input
| MM+MC RCA | RCA | RCA+3.5mm AUX | Bluetooth + AUX + RCA | RCA+3.5mm AUX | AUX + RCA | Bluetooth + RCA |
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Output
| RCA | RCA + Headphone | RCA | RCA | RCA+3.5mm AUX | 3.5 mm + 6.35 mm | RCA + 3.5mm Headphone + AUX |
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Treble & Bass Control
| ✘ | ✘ | ✘ | ✔ | ✔ | ✘ | ✔ |
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THD
| ≤0.009% | ≤ 0.08% | ≤ 0.1% | ≤ 0.1% | ≤ 0.1% | ≤0.03% | ≤ 0.02% |
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SNR
| ≥ 92dB | ≥ 70dB | ≥ 98dB | ≥ 70dB | ≥ 70dB | ≥ 95dB | ≥103 |
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Terminating Impedance
| - | - | - | - | - | - | - |
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Power Adapter
| AC 16V | 12V/1.5A | 12V/1.5A | 12V/1.5A | 12V/1.5A | 12V/1.5A | 12V/1.5A |
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Work Voltage
| AC 120V | AC 110V - 240V | AC 110V - 240V | AC 100V - 240V/ DC 12V | AC 110V - 240V | AC 110V - 240V | AC 110V - 240V |

















