--- product_id: 561896532 title: "Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp" brand: "fosi audio" price: "AR$492478" currency: ARS in_stock: true category: "Fosi Audio" url: https://www.desertcart.com.ar/products/561896532-box-x4-phono-preamp-and-headphone-amplifier-with-jan-5654w store_origin: AR region: Argentina --- # 3.5mm AUX headphone output Replaceable JAN 5654W vacuum tubes RCA output for versatile connectivity Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp **Brand:** fosi audio **Price:** AR$492478 **Availability:** ✅ In Stock ## Summary > 🎶 Elevate your vinyl vibe with tube-powered warmth and pro-level control! ## Quick Answers - **What is this?** Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp by fosi audio - **How much does it cost?** AR$492478 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/561896532-box-x4-phono-preamp-and-headphone-amplifier-with-jan-5654w) ## Best For - fosi audio enthusiasts ## Why This Product - Trusted fosi audio brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Next-Gen Sound Clarity:** Experience pristine audio with the upgraded BOX X4 preamp, elevating your vinyl sessions to audiophile status. - • **Customizable Tube Tones:** Swap vacuum tubes like JAN 5654W or 6K4 to tailor your sound signature—because your music deserves personality. - • **Dual Output Flexibility:** Seamlessly connect headphones or RCA speakers for private listening or immersive room-filling sound. - • **Precision Audio Controls:** Fine-tune volume, bass, and treble with intuitive knobs, putting you in full command of your sonic environment. - • **Plug & Play with Confidence:** Includes DC 12V power supply and backed by a 24-month warranty—hassle-free setup and lasting reliability. ## Overview The Fosi Audio Box X4 is a cutting-edge phono preamp and headphone amplifier featuring premium JAN 5654W vacuum tubes for rich, warm sound. Designed for MM turntables, it offers versatile 3.5mm AUX and RCA outputs, customizable tube options, and precise volume, bass, and treble controls. Lightweight and backed by a 24-month warranty, it’s the perfect upgrade for discerning audiophiles seeking next-level analog audio performance. ## Description Buy Fosi Audio Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp online on desertcart.ae at best prices. ✓ Fast and free shipping ✓ free returns ✓ cash on delivery available on eligible purchase. ## Features - The updated version for BOX X2. Next-generation phone preamp for unparalleled sound quality. - Tube Headphone Amplifier & Preamp: The BOX X4 is designed with a 3.5MM AUX headphone and RCA output, very useful beyond imagination. - Applicable Vacuum Tubes Model: 6K4/6J1/6J4/GE5654/6AK5/66*In vacuum tubes, etc. You can replace the vacuum tubes to DIY your stereo. Different tubes with different sounds. - What you get: BOX X4 phono preamp, DC 12V power supply, manual, our worry-free 24-month warranty, and friendly customer service. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07L4TMHRN | | Best Sellers Rank | #65,660 in Electronics ( See Top 100 in Electronics ) #10 in Home Audio Phono Preamplifiers | | Brand | Fosi Audio | | Built-In Media | JAN 5654W tubes | | Customer Reviews | 4.2 4.2 out of 5 stars (931) | | Item Weight | 0.36 Kilograms | | Manufacturer | Fosi Audio | | Mfr Part Number | BOX-X4 | | Model Number | BOX X4 | | Number of Items | 1 | ## Product Details - **Item dimensions L x W x H:** 10.2 x 5.1 x 2.5 centimeters - **Manufacturer:** Fosi Audio - **Maximum supply voltage:** 12 Volts (DC) - **Minimum supply voltage:** 12 Volts (DC) - **Voltage:** 12 Volts (DC) ## Images ![Box X4 Phono Preamp & Headphone Amplifier with JAN 5654W Vacuum Tubes for MM Turntable Phonograph Preamplifier for Record Player with Volume Bass Treble Control Hi-Fi Pre Amp - Image 1](https://m.media-amazon.com/images/I/611il3yf1BL.jpg) ## Questions & Answers **Q: I have the pyle turntable and fosi audio tb10a amp but the sound is very low, so i need to add this phono preamp to amplify sound?** A: Yes, you need connect this phono preamp between the turntable and tb10a amp, it will amplify the sound also improve the sound quality. Thanks. **Q: Can I directly connect this phono preamp to the speakers?** A: If your speakers are powered speakers, you can directly connect this preamp to the speakers. But you need add an amplifier or receiver to the passive speakers. Thanks. **Q: Does this work best with Ceramic or Magnetic stylii? Can it do both?** A: As long as your cartridge can output a voltage between ~2.0 -5 0 millivolts, the Fosi Audio Box X4 should work. Amazon cells ceramic cartridges around $10, that I want to experiment with one. Thanks for your question. **Q: Why would an upgraded model have an snr of 70db and the older version is at 98db? seems like a downgrade. are those specs correct?** A: I have a feeling that either this measurement is incorrect or the previous model's measurement is wrong. There is not enough information in either measurement; how did they do it? What kind of signal was used? What frequency? Was this measured with or without a signal going into it? Was it measured while playing an actual track off vinyl, or dead wax? Did the SNR change if you engaged the EQ? Even if the previous model gave you 98dB, it's impossible to reach that measurement with vinyl — even the cleanest, best vinyl ever made while using the most expensive, best stylus, cartridge, preamp, etc. isn't going to give you anything better than ~70dB. The X4 specs state ≥ 70dB which means at the very least it will give you 70dB or above. Having said all that, I think the X4 sounds great, especially for the price! ## Frequently Bought Together - Fosi Audio Box X4 Phono Preamp with JAN 5725W Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control - Monoprice 1.5ft Premium 2 RCA Plug/2 RCA Plug M/M 22AWG Cable - Black - Riverstone Audio - Tested/Matched Pair (2 Tubes) 7-Pin JAN 5654W Fully-Tested Vacuum Tubes - Upgrade for 6AK5 / 6J1 / 6J1P / EF95 - JAN 5654W Platinum Grade Pair --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.ar/products/561896532-box-x4-phono-preamp-and-headphone-amplifier-with-jan-5654w](https://www.desertcart.com.ar/products/561896532-box-x4-phono-preamp-and-headphone-amplifier-with-jan-5654w) --- *Product available on Desertcart Argentina* *Store origin: AR* *Last updated: 2026-10-15*