SPECIFICATIONS
Brand Name: Fosi Audio
Certification: CE
Channels: 2 (2.0)
Features: Preamp,Home Audio Preamplifier
Hign-concerned Chemical: None
Input: 3 RCA Inputs
Maximum Power Per Channel: NO POWER
Model Number: P4
Origin: Mainland China
Output: RCA+PRE OUT
Package: Yes
Power Adapter: 12V/1.5A
Features:
Studio-Level Signal Accuracy | ±0.1dB Frequency Response & 105dB SINAD
Pure, untainted reference-quality sound, tailored for discerning ears.
With a flat frequency response from 20Hz to 20kHz (±0.1dB) and a 105dB SINAD (Signal-to-Noise Ratio + Distortion), the P4 achieves nearly lossless signal transmission. Featuring Japanese Elna audio capacitors and Omron gold-plated signal relays, it eliminates current noise to ensure every detail is faithfully reproduced, rivaling the performance of high-end preamps costing tens of thousands.Three-Input Hub | One-Touch Switch Between CD, Vinyl, and DAC
Say goodbye to constant plugging and unplugging, and build a multi-device Hi-Fi system.
Three independent RCA inputs allow you to simultaneously connect a turntable (with external phono preamp), CD player, and high-end DAC. With the infrared remote, you can easily switch between sources with a single button press. Whether you’re enjoying your classic vinyl collection or streaming Hi-Res music, simply press a button to experience seamless listening.Gain Staging + Motorized Potentiometer | Precision Matching for Power Amplifiers
Perfectly adaptable from low-sensitivity to high-resolution systems.
3dB/6dB/9dB Gain Adjustment:
▸ Low Gain (3dB): Protects sensitive power amplifiers from overload distortion.
▸ High Gain (9dB): Reduces system noise floor and enhances dynamic range.
The ALPS vintage motorized volume knob uses an analog potentiometer structure with left-right channel error <0.1dB, ensuring smooth, unbiased volume control.Tone Control Freedom | Adjustable EQ + Replaceable Op-Amps + Bypass Mode
From precise monitoring to personalized sound tuning, a dual-purpose machine.
Midpoint-adjustable bass and treble: Compensate for room acoustics or enhance rock/jazz atmospheres.
Hi-Fi Bypass Mode: Direct signal path with the EQ circuit bypassed, delivering uncolored, high-resolution sound.
Replaceable op-amp design: Compatible with popular dual-op-amp chips (such as MUSES02/OPA2604), allowing you to easily customize the sound signature to your preference—whether it's a "warm tube-like" or "crisp, analytical" tone.Minimalist Control Aesthetic | Full-Function Remote + Compact Metal Chassis
Ideal for both desktop and rack setups, blending seamlessly into high-end systems.
Comprehensive remote control: Power on/off, switch inputs, and adjust volume/mute without the awkward "bending over to find the knob" experience.
PRE OUT Output: Connect an active subwoofer for a 2.1 system, or link multiple amplifiers for multi-room audio.
Highlight:
Model: P4
Power Adapter Output: 12V/1.5A
Product Adapter Input Voltage Range: AC 110V - 240V
SNR ≥ 110dB
THD ≤ 0.003%
Treble adjustment range: ±6dB
Bass adjustment range: ±12dB
Input Mode: 3 RCA
Output: RCA/AUX
Frequency Response: 20HZ -20KHZ((±0.1dB)
Package Include:
*P4 Preamplifier x1
*Power Adaptor x1
*User Manual x1
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Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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