SKU: 28853608154

Pro-Ject Phono Box S3 B

Sale price$283.05 Regular price$314.50
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Ships within 48 hours · Estimated delivery Aug 7 - Aug 12

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Description

Pro-Ject Phono Box S3 BEntry Level True Balanced Phono Stage A New Access to High End Features THE NEW PHONO BOX S3 B The Phono Box S3 B is an entry level phono preamplifier that offers a fully balanced design in a neat, small package. Weve packed this tiny chassis to the brim with high end features. One of those is our new True Balanced Connection. At Pro Ject, balanced connections were exclusive to our RS range of products until now. The Phono Box S3 B brings those

Entry-Level True Balanced Phono Stage

A New Access to High-End Features

THE NEW PHONO BOX S3 B

The Phono Box S3 B is an entry-level phono preamplifier that offers a fully balanced design in a neat, small package. We’ve packed this tiny chassis to the brim with high-end features.

One of those is our new True Balanced Connection. At Pro-Ject, balanced connections were exclusive to our RS range of products until now. The Phono Box S3 B brings those features to an incredible new entry level.

True High-End For the New Entry-Level

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

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 allow you to account for all situations.

Balanced By Nature

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 to access the entirety of that balanced signal.

Together with our new True Balanced Connection cables you'll be able to access high-end features that were previously only available on the most expensive of phono stages. And the best of all: any Pro-Ject turntable with RCA, miniXLR or 5P outputs can do it.

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 results in the best sound quality. The fully symmetrical gain stage can optimize the signal-to-noise ratios, feeding the semi-passive, RIAA equalisation stage with a clean signal to work on.

TRUE BALANCED CONNECTION

The symmetrical design is the fundamental standout feature! 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 (household appliances, wifi & Bluetooth, power cables, audio amplifiers).

High-End Features

For the Entry-Level

Steel & aluminium casework. Fully discrete & symmetrical gain stage. Balanced in & outputs. Cartridge loading options on front panel.

True Balanced

Unleash the full power

Phono Box S3 B is ready for our new True Balanced Connection. Single-ended RCA connections, quite literally, only use half of your cartridge's output. With one of our new True Balanced phono cables and an MC cartridge you'll hear details and dynamics, previously exclusive to only the most expensive phono stages.

Handmade in EU

Since 1991

Made in Europe by technicians, engineers and designers with decades of experience. Expert craftsmanship. Sustainable products with a long lifetime. Audiophile audio performance.

Input impedance: 10, 50, 100, 1k, 47k ohms
Input capacitance: 50, 150, 300, 400 pF
Gain (+ 6dB using XLR Out sockets): 40, 45, 60, 65 dB
Signal / Noise ratio MM (40dB): 103dBV, 110dBV - 'A' weighted
Signal / Noise ratio 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 sockets
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: 206 x 55 x 153 (164 with sockets) mm (W x H x D)
Weight: 930g without power supply
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 28853608154

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4.8 ★★★★★
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Marooned
Grantham, US
★★★★★ 3
Prevents me from adjusting the air vent up or down
It's true that it doesn't block the air flow. I had to put it on the left passenger side vent to retain the ability to point the driver's air vents where I want. With it over there, I have to turn my head too far to the right when I'm driving to see my phone, and the passenger can't adjust the vent up or down. Also, phone can't tilt as far left and right as other ones. Good price, unique design, easy to install, feels sturdy, holds iPhone SE fine, and doesn't block my view of the entertainment system.
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Reviewed in the United States on March 27, 2026
S
Verified Purchase
ShopDoc1
Alexandria, US
★★★★★ 5
BETTER THAN A CUP HOLDER
I had a cup-holder mount and it was always falling apart. No matter how it was turned, to unfasten my phone I had to move the spring part of the holder in the same direction that removes the entire clip from the stem of the mount. Of course, I eventually lost the clip. What a bad idea. And, in a 4-Runner, on my cupholder, MAPS sometines got lost and I would have to hold my phone up to the windshield for a minute to get back MAPS back on track. Also not a good Idea. We're not supposed to be handeling a phone and driving so holding my phone up to the windshield is kinda like flagging down a cop. (The 4-Runner has hand-free phone service, as well as some kind of circuitious navigation but it's always lost.) . So, for about $9 on sale, I though I would try one of these LISEN mounts. It works great ! Really. Easy to attach securely but scratchlessly it to my center AC/heat vent and It is infantly moveable. Swing the arm 360 degrees, in and out, phone up or saideways, and tilt the phone to me or the Boss. If I get bored, I can relocate it anywhere along the center vents, or even over to my side vent if I have nothing better to do.. It is sturdy, quiet, easy to clamp in my S21, and release is simplye by pushing the button on the back. Sooo much better that my previous mount, for a third of the price. It might be the best $9 you ever spent. And still worthwhile,if you have to shell out the $18. (But I always try to avoid paying full price for anything). Enjoy !
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Reviewed in the United States on December 10, 2023
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Spark Yip
Houston, US
★★★★★ 5
Usable but average, with only basic build quality and stability.
This in-car phone mount is fairly average overall. It’s easy to install and works for basic navigation needs, but the build quality isn’t particularly impressive. The materials feel a bit ordinary, and stability can be an issue on rough roads, with some looseness over time. It’s usable, but not outstanding.
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Reviewed in the United States on February 10, 2026
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Big Al NJ
Omaha, US
★★★★★ 5
Best wax ever - not kidding!
We have 2 classic cars we restored and put in shows, along with our regular daily drivers. Some of the cars are darker colors, like grey, blue, or black, and the others are white and a light seafoam green. The problems I've had with other waxes, including other higher end products was streaking, and not being able to remove the swirls. Not so with Black light. This is hands down the best wax I have ever used. The application is simple, and I've done it in shade as well as sun, both with excellent results. Use a microfiber applicator to apply, thin, not thick coats in a circular motion. Then wait - let it set for 15 minutes. Final step - use a clean microfiber cloth to remove. It removes so easy, and leaves no swirl or haze like other waxes. The depth of shine is also noticeable. It makes the paint smooth with a deep shine, no matter the color or if its metallic or not. It just looks great. Bonus - it even smells great! I was so impressed I ordered a few more of their products and we'll be testing those shortly. For years I've bought and tried almost everything at stores and car shows and nothing impressed me. Black Light impresses me so much I'll be using it exclusively from now on. It's really that good.
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Reviewed in the United States on April 24, 2019
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Verified Purchase
K9YarYar
Massapequa, US
★★★★★ 5
AMAZING!
I have tried a lot of products and always looking for the next great purchase to keep my 2000 Boxster (black in color) looking its best. Just finally used it and I am IMPRESSED! This stuff goes on easily. You use very little product and it cleans off easily. Leave an AMAZING shine and really makes the black look deep. I am vey happy with this product.
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Reviewed in the United States on April 13, 2026

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