Pro-Ject Phono Box S3 B Phono Preamplifier

Highly Affordable Fully Balanced MM.MC Phono Preamp

The Pro-Ject Phono Box S3 B is an entry-level phono preamplifier that offers a fully balanced design in a neat, small package. Pro-Ject packed this tiny chassis to the brim with high-end features. One of those is Pro-Ject's new True Balanced Connection, which formerly were exclusive to Pro-Ject's RS product series. The Phono Box S3 B brings those features to an incredible new entry level phono preamp.

True High-End Defines a New 'Entry-Level'

The Phono Box S3 B comes in complete new casework. The bigger size enables Pro-Ject to bring a completely new feature set that was never seen before in this price range. The new steel and aluminum case also offers very high rigidity and isolation against outside interferences, which is essential for the new technology inside.

Phono Box S3 B allows you to connect up to two turntables simultaneously – all parameters for each input get stored in the memory. You can perfectly match the Phono Box S3 B to a wide variety of cartridges. Use the gain setting to accurately match the output to other sources like CD players or streaming devices. Ultra-low values like 50 pF or 10 ohms accommodate a wide range of possibilities.

Balanced by Nature

The balanced, symmetrical design is the fundamental standout feature of the Phono Box S3 B. Connect your turntable via the 5-pin mini XLR cable and enjoy the benefits of a balanced signal path. A truly balanced gain stage can extract the final musical information, effectively filtering out any noise from interferences stemming from our noisy, modern homes – such as household appliances, WiFi, Bluetooth, and audio amplifiers.

Cartridges are balanced signal transducers by nature. Due to the internal wiring of MM cartridges, you'll need to upgrade your turntable with an MC cartridge if you want to access the entirety of that balanced signal. Any Pro-Ject turntable with RCA, miniXLR, or 5P outputs is fully compatible with the Phono Box S3 B.

Fully Discrete and Symmetrical Gain Stage

The new Phono Box S3 B gain stage uses a fully discrete layout. A discrete circuit is composed of disparate electronic components and individual devices. The amplifier section is built of single parts and doesn't use any integrated circuits. That makes for an extended and more costly design process, but it results in the best sound quality. The fully symmetrical gain stage can optimize the signal-to-noise ratios, feeding the semi-passive RIAA equalization stage with an exceptionally clean signal.

Product Features

Hi-res MM/MC phono preamplifier
NEW 5-pin mini XLR balanced input
NEW balanced XLR outputs
NEW fully symmetrical & discrete gain stage
NEW easy settings adjustment on the faceplate
Dual mono design
Semi-passive RIAA equalization
Superior low noise / low distortion
Aluminum casing protects against interference
Available in silver or black
Made in Europe

Product Specs

Input impedance: 10, 50, 100, 1k, 47k ohms
Input capacitance: 50, 150, 300, 400 pF
Gain (+ 6dB using XLR Out): 40, 45, 60, 65 dB
SNR MM (40dB): 103dBV, 110dBV - A weighted
SNR MC (60dB): 85dBV, 90dBV - A weighted
THD at 1 kHz: <0.001% MM, < 0.005% MC
THD (20Hz-20kHz): <0.008% MM, < 0.01% MC
RIAA-equalization curve accuracy: <0.3dB / 20Hz - 20kHz
Subsonic filter: at 20Hz with 18dB/octave
Input: 1x 5-pin mini XLR / 1x pair RCA phono jacks
Line-level output: 1x pair RCA, 1x pair XLR
Power supply DC: 18V/500mA
Power consumption: 18V/170mA DC, <0.5 W in standby
Dimensions: 8.1" x 2.1" x 6.0" (6.4" with connectors)
Weight: 2.0 lb. without power supply

Product Warranty

Parts & Labor

2 Years

Pro-Ject Audio Systems Warranty Information

Product Manual

	Pro-Ject Phono Box S3 B Manual (PDF Format)

	Pro-Ject Phono Box S3 B Information Sheet (PDF Format)

Audio Advisor occasionally has fantastic deals on clearance items that are in excellent condition and we happen to have just one or two of.

Demo: Photo samples, gear we auditioned, items returned for wrong color/wrong size, etc.

Open Box: Contents briefly examined or inspected for promotional or internal purposes

Factory Refreshed: Original-condition items repackaged by the manufacturer

Cosmetically Blemished: A few dings or scratches, but functionally in original condition

Used: May show some signs of use

All clearance products are carefully inspected by our technicians before we offer the item for sale. All clearance products except Used items come with the original manufacturer warranty and are guaranteed to work and sound like new.

RETURN POLICY & PROCESS

NOTE:
You may only return a product purchased within 60-days of the receipt date.
The product must be in like-new condition and shipped in the original packaging (So SAVE THOSE BOXES!!!)

Call 1-800-942-0220 to request an RMA number.
Print the RMA number on the return shipping label.
Please make sure the return shipping name and address are written in a note on the inside.
Ship package to…

Audio Advisor Returns
5500 Executive Parkway SE
Grand Rapids, MI 49512
(PRINT YOUR RMA NUMBER HERE)

NOTE: If a coupon was used in the ordering process, then the final value (recorded during payment) will be the price refunded.

Returned products are inspected by our warehouse and refunds are issued within 24 hours of inspection. Please note: it may take 7-10 business days for your bank to show the refunded amount. If you do not see it then, please reach out to our customer service team at 1-800-942-0220.

Audio Advisor will ship products anywhere in the United States, including Alaska, Hawaii, and U.S. Territories.