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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

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

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?

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?

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?

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?

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!

Product ID: 107404737

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Details

Item dimensions L x W x H
10.2 x 5.1 x
Voltage
12 Volts (DC)
Manufacturer
Fosi Audio
Maximum supply voltage
12 Volts (DC)
Minimum supply voltage
12 Volts (DC)

💡Customizable vacuum tube sound

🔊Dual RCA & headphone outputs

🎛️Pro-grade MM phono stage

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

Description

🎶 Elevate your vinyl game with tube-powered precision and personalized sound!

TAILOR YOUR TONE - Unlock endless sonic possibilities by swapping vacuum tubes (6K4/6J1/GE5654/6AK5 compatible) to craft your perfect vinyl vibe.
PRECISION EQ CONTROLS - Fine-tune bass and treble with ±10dB active controls, enhancing warmth or clarity while preserving the authentic analog character.
COMPLETE CONFIDENCE KIT - Includes power supply, user manual, and a 24-month warranty backed by responsive customer service—your vinyl’s new best friend.
AUDIOPHILE GRADE CLARITY - Experience pristine analog sound with the upgraded JAN 5725W vacuum tube preamp and grounding terminal that eliminates hum and protects your vinyl.
SEAMLESS LISTENING MODES - Switch effortlessly between RCA line-level output for your amplifier and a powerful 3.5mm headphone output for private, late-night sessions.

The Fosi Audio BOX X4 is a high-fidelity phono preamp and headphone amplifier designed for MM turntables. Featuring a low-noise JAN 5725W vacuum tube, dual RCA and headphone outputs, and active bass/treble controls, it delivers customizable, hum-free analog sound. Its tube rolling flexibility and grounding terminal make it ideal for audiophiles seeking warm, detailed vinyl playback, all backed by a 24-month warranty.

Specifications

Manufacturer	Fosi Audio
Item model number	BOX X4
Product Dimensions	10.16 x 5.08 x 2.54 cm; 362.87 g
ASIN	B07L4TMHRN

Have a Question? See What Others Asked

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?

Can I directly connect this phono preamp to the speakers?

Does this work best with Ceramic or Magnetic stylii? Can it do both?

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?

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