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Fosi Audio BOX X4 Phono Preamp Headphone Amplifier/Preamplifier Hi-Fi Pre Amp with JAN 5725W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control

Description:

  • Pro-Grade MM Phono Stage with Grounding Terminal: Upgraded from BOX X2, the BOX X4 delivers audiophile-grade clarity for your turntable. Features a low-noise JAN 5725W vacuum tube preamp with MM input and built-in earth terminal to eliminate hum and protect vinyl systems. Ensure your turntable’s internal preamp is disabled for pure analog playback.
  • Dual-Output Flexibility--Preamp + Headphone Amp:Switch seamlessly between RCA line-level output for amplifiers and 3.5mm headphone output for private listening. Engineered to drive most headphones, ideal for late-night vinyl sessions without disturbing others.
  • Tube Rolling Flexibility for Custom Sound:Unlock endless audio personalities! Swap stock JAN 5725W tubes with 6K4/6J1/GE5654/6AK5 tubes (sold separately). A DIY haven for vinyl enthusiasts.
  • Active Bass & Treble Controls for Vinyl Optimization:Fine-tune your records with ±10dB bass/treble EQ – boost warmth for vintage LPs or sharpen detail for modern pressings. Paired with low-noise circuitry to preserve original analog character.
  • Complete Kit with Extended Warranty:Includes BOX X4 phono preamp, DC 12V power supply, user manual, our worry-free 24-month warranty, and friendly customer service.
  •  

    What's in the box?

  • 12V Power Supply
  • Details:

    Fosi Audio BOX X4 Phono Preamp Headphone Amplifier/Preamplifier Hi-Fi Pre Amp with JAN 5725W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control

    Product ID: KO07Y4GZUEA
    Condition: New

    QAR69534

    Price includes VAT & Import Duties
    Color: BOX X4
    Product imageProduct imageProduct imageProduct image
    Availability: In Stock

    Quantity:

    |

    Order today to get by 7-14 business days

    This item qualifies for free delivery

    Returns & Warranty policies

    Imported From: United Kingdom

    At BOLO, we work hard to ensure the products you receive are new, genuine, and sourced from reputable suppliers.

    Every product in the BOLO catalogue is sourced through our Verified Global Supply Network of verified sellers, authorized distributors or directly from the manufacturer.

    Each product undergoes thorough inspection and verification at our consolidation and fulfilment centers to ensure it meets our strict authenticity and quality standards before being shipped and delivered to you.

    If you ever have concerns regarding the authenticity of a product purchased from us, please contact Bolo Support. We will review your inquiry promptly and, if necessary, provide documentation verifying authenticity or offer a suitable resolution.

    Your trust is our top priority, and we are committed to maintaining transparency and integrity in every transaction.

    While we strive to display accurate information, variations in packaging, labeling, instructions, or formulation may occasionally occur due to regional differences or supplier updates. For detailed or manufacturer-specific information, please contact the brand directly or reach out to BOLO Support for assistance.

    Unless otherwise stated, all prices displayed on the product page include applicable taxes and import duties.

    BOLO operates in accordance with the laws and regulations of Qatar. Any items found to be restricted or prohibited for sale within the Qatar will be cancelled prior to shipment. We take proactive measures to ensure that only products permitted for sale in Qatar are listed on our website.

    All items are shipped by air, and any products classified as “Dangerous Goods (DG)” under IATA regulations will be removed from the order and cancelled.

    All orders are processed manually, and we make every effort to process them promptly once confirmed. Products cancelled due to the above reasons will be permanently removed from listings across the website.

    Product details by manufacturer
    Product details by manufacturer
    Product details by manufacturer

    Treble and Bass independent gain rotation design, sound quality is under control, adding more playability and fun for music, more ways to play and wait for you to discover.

    Product details by manufacturer

    A 3.5mm headphone amplifier output interface is compatible with an ordinary 3.5mm headset. It is designed for headphone users, reserves the gain interface for audiophile DIY. This preamp can restore the sound more clearly.

    Product details by manufacturer

    This preamp uses 5725W vacuum tubes, has a softer listening experience, simulates natural sound, makes audio equipment keep a classic acoustic tone, and achieves beautiful Hi-Fi sound quality. 5725W tubes can be replaced by 6K4/6J1/6J4/6AK5/66*In vacuum tubes, etc. to suit audiophile’s needs.

    Product details by manufacturer

    Suitable for moving-magnet (MM) cartridges. Precise RIAA equalization. Consistent sonic performance, super low noise.

    Product details by manufacturer

    This mini preamp has stereo RCA inputs and stereo RCA outputs Connect the turntable to the RCA inputs and ground.

    Product details by manufacturer

    The power supply has performances such as short-circuit protection and overload protection. And effectively reduce the impact of AC input.

    More from this brand

    Similar items from “Preamplifiers”

    Fosi Audio BOX X4 Phono Preamp Headphone Amplifier/Preamplifier Hi-Fi Pre Amp with JAN 5725W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control

    Product ID: KO07Y4GZUEA
    Condition: New
    Fosi Audio BOX X4 Phono Preamp Headphone Amplifier/Preamplifier Hi-Fi Pre Amp with JAN 5725W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control-0
    Color: BOX X4
    Product imageProduct imageProduct imageProduct image

    QAR69534

    Price includes VAT & Import Duties
    Availability: In Stock

    Quantity:

    |

    Order today to get by 7-14 business days

    This item qualifies for free delivery

    Returns & Warranty policies

    Imported From: United Kingdom

    At BOLO, we work hard to ensure the products you receive are new, genuine, and sourced from reputable suppliers.

    Every product in the BOLO catalogue is sourced through our Verified Global Supply Network of verified sellers, authorized distributors or directly from the manufacturer.

    Each product undergoes thorough inspection and verification at our consolidation and fulfilment centers to ensure it meets our strict authenticity and quality standards before being shipped and delivered to you.

    If you ever have concerns regarding the authenticity of a product purchased from us, please contact Bolo Support. We will review your inquiry promptly and, if necessary, provide documentation verifying authenticity or offer a suitable resolution.

    Your trust is our top priority, and we are committed to maintaining transparency and integrity in every transaction.

    While we strive to display accurate information, variations in packaging, labeling, instructions, or formulation may occasionally occur due to regional differences or supplier updates. For detailed or manufacturer-specific information, please contact the brand directly or reach out to BOLO Support for assistance.

    Unless otherwise stated, all prices displayed on the product page include applicable taxes and import duties.

    BOLO operates in accordance with the laws and regulations of Qatar. Any items found to be restricted or prohibited for sale within the Qatar will be cancelled prior to shipment. We take proactive measures to ensure that only products permitted for sale in Qatar are listed on our website.

    All items are shipped by air, and any products classified as “Dangerous Goods (DG)” under IATA regulations will be removed from the order and cancelled.

    All orders are processed manually, and we make every effort to process them promptly once confirmed. Products cancelled due to the above reasons will be permanently removed from listings across the website.

    Description:

  • Pro-Grade MM Phono Stage with Grounding Terminal: Upgraded from BOX X2, the BOX X4 delivers audiophile-grade clarity for your turntable. Features a low-noise JAN 5725W vacuum tube preamp with MM input and built-in earth terminal to eliminate hum and protect vinyl systems. Ensure your turntable’s internal preamp is disabled for pure analog playback.
  • Dual-Output Flexibility--Preamp + Headphone Amp:Switch seamlessly between RCA line-level output for amplifiers and 3.5mm headphone output for private listening. Engineered to drive most headphones, ideal for late-night vinyl sessions without disturbing others.
  • Tube Rolling Flexibility for Custom Sound:Unlock endless audio personalities! Swap stock JAN 5725W tubes with 6K4/6J1/GE5654/6AK5 tubes (sold separately). A DIY haven for vinyl enthusiasts.
  • Active Bass & Treble Controls for Vinyl Optimization:Fine-tune your records with ±10dB bass/treble EQ – boost warmth for vintage LPs or sharpen detail for modern pressings. Paired with low-noise circuitry to preserve original analog character.
  • Complete Kit with Extended Warranty:Includes BOX X4 phono preamp, DC 12V power supply, user manual, our worry-free 24-month warranty, and friendly customer service.
  •  

    What's in the box?

  • 12V Power Supply
  • Details:

    Product details by manufacturer
    Product details by manufacturer
    Product details by manufacturer

    Treble and Bass independent gain rotation design, sound quality is under control, adding more playability and fun for music, more ways to play and wait for you to discover.

    Product details by manufacturer

    A 3.5mm headphone amplifier output interface is compatible with an ordinary 3.5mm headset. It is designed for headphone users, reserves the gain interface for audiophile DIY. This preamp can restore the sound more clearly.

    Product details by manufacturer

    This preamp uses 5725W vacuum tubes, has a softer listening experience, simulates natural sound, makes audio equipment keep a classic acoustic tone, and achieves beautiful Hi-Fi sound quality. 5725W tubes can be replaced by 6K4/6J1/6J4/6AK5/66*In vacuum tubes, etc. to suit audiophile’s needs.

    Product details by manufacturer

    Suitable for moving-magnet (MM) cartridges. Precise RIAA equalization. Consistent sonic performance, super low noise.

    Product details by manufacturer

    This mini preamp has stereo RCA inputs and stereo RCA outputs Connect the turntable to the RCA inputs and ground.

    Product details by manufacturer

    The power supply has performances such as short-circuit protection and overload protection. And effectively reduce the impact of AC input.

    More from this brand

    Similar items from “Preamplifiers”