The Fosi Audio BOX X1 is a compact MM phono preamp that converts a turntable's phono signal to line level, with RCA and 3.5mm headphone outputs that work at the same time and a 12V/1.5A adapter in the box. It suits turntable owners whose amp or powered speakers lack a phono input, and anyone who wants to hear records on headphones.
Who the Fosi Audio BOX X1 is for
Turntables without a phono stage: It works with MM (moving magnet) cartridges and applies standard RIAA equalization, rated at 70dB SNR and ≤0.08% THD.
Powered speakers: The RCA line output connects straight to active speakers, or to a power amplifier that then drives passive speakers.
Headphone listening: The 3.5mm headphone jack runs alongside the RCA output, so headphones and speakers can stay connected at the same time.
Grounded turntables: A grounding post on the back accepts your turntable's ground wire.
Skip it if: You use a moving coil (MC) cartridge or want to drive passive speakers directly; it is built for MM cartridges and is not a power amplifier.
Fosi Audio BOX X1 key specs
Cartridge type: MM (moving magnet)
Inputs: MM turntable RCA, grounding post, 12V DC
Outputs: RCA line out and 3.5mm headphone out, usable at the same time
Output level: 2V max (P-P) at 10kΩ
SNR: 70dB
THD: ≤0.08% @ 1kHz, 3mV
Equalization: Standard RIAA
Power: 12V/1.5A adapter (AC 100–240V input), included
Size and weight: 3.94 × 2.17 × 0.98 in (100 × 55 × 25 mm), 0.35 lb (161g)
In the box: BOX X1 phono preamp, 12V/1.5A power adapter, user manual
Genuine Fosi Audio stock. Free shipping on every order, 45-day returns.
Fosi Audio BOX X1 vs similar options
vs SMSL PH-1: Costs about twice as much and is also rated for high-output MC cartridges; pick the BOX X1 to spend less on an MM preamp that still has a 3.5mm headphone out.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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