Audiophoria
Fosi Audio Box X5 Phono Preamplifier

Compact MM/MC phono preamplifier with OPA1612, four gain settings, precise RIAA equalization and low-noise RCA output.

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€99.00

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System Matching Guide

Optimal For:

MM and MC turntables without a built-in phono stage

Not Ideal For:

Systems requiring a line-level preamp or digital inputs

Power Consumption: little

Pair with the BT20A MAX

Add the Box X5 to the BT20A MAX when connecting an MM or MC turntable to one of its analogue RCA inputs.

Available on backorderFosi
Fosi Audio BT20A MAX-48V Class D stereo amplifier front view

Fosi Audio BT20A MAX Integrated Amplifier

Amplifiers

€209.00

Highlights

Cartridge Support
MM and MC
Gain Adjustment
38 / 48 / 56 / 66dB
Phono Equalization
Precision RIAA equalization
Analogue Circuit
OPA1612 with precision passive components
Signal-to-Noise
≥92dB
Connectivity
Stereo RCA input + RCA output

FOSI AUDIO BOX X5 PHONO PREAMPLIFIER

The Fosi Audio Box X5 is a compact phono preamplifier designed for both moving-magnet and moving-coil cartridges. It provides the gain and RIAA equalization required to connect a turntable to an amplifier, preamplifier or active speaker system without a dedicated phono input.

MM & MC CARTRIDGE COMPATIBILITY

A front-panel selector allows the Box X5 to operate with either MM or MC cartridges. This makes it suitable for a broad range of turntables and cartridge types, while a dedicated grounding terminal provides the correct connection point for compatible turntable ground leads.

FOUR SELECTABLE GAIN LEVELS

The rear-panel gain selector provides four settings of 38dB, 48dB, 56dB and 66dB. This allows the output level to be matched more appropriately to different cartridge sensitivities, from conventional moving-magnet designs to lower-output moving-coil cartridges.

OPA1612 & PRECISION RIAA EQUALIZATION

The analogue circuit uses an OPA1612 operational amplifier together with precision passive components. Fosi Audio specifies 2% polyester film capacitors, 0.1% precision film resistors and carefully selected audio capacitors, supporting accurate RIAA equalization and low-noise operation.

SIMPLE ANALOGUE SIGNAL PATH

Connectivity is deliberately straightforward: a stereo RCA phono input accepts the turntable signal, while a stereo RCA output connects to the line-level input of the downstream amplifier or preamplifier. The Box X5 is a dedicated phono stage and is not intended to operate as a conventional line-level preamplifier.

COMPACT ALUMINIUM CHASSIS

The Box X5 uses an aluminium-alloy enclosure with front-panel power and cartridge-type controls. Its compact dimensions make it easy to position close to a turntable, while the supplied 16V power adapter provides the dedicated supply required by the phono circuit.

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Professional reviews

Audio Science Review
"Fosi innovates by bringing best in class performance while packaging the unit in an attractive enclosure."

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