SKU: 74356156437

Pro-Ject Phono Box S3 B

Sale price$283.05 Regular price$314.50
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Ships within 48 hours · Estimated delivery Jul 18 - Jul 23

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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: 74356156437

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4.1 ★★★★★
Based on 11 reviews
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Verified Purchase
Amazon Customer
San Leandro, US
★★★★★ 5
Thick & sturdy.
Color: Blue
Great mat! Nice thick, sturdy foam! -- Im using it along my raised garden beds so I can crawl across the area that's covered w wood chips to work. I cover up lumber edges w old staples with one edge too, and can push myself up & slide it along beneath me. Great on my knees and elbows. Eliminates the need to constantly get up & down. Nice thick, sturdy foam! Gets slippery fast if I hit it w the hose!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
K
Verified Purchase
Kelly B. - Honest Hands-On
Battle Creek, US
★★★★★ 5
Durable and Comfortable Yoga Mat That Lasts
Color: Red
The BalanceFrom Go Yoga All Purpose Exercise Mat has proven to be a long-lasting and reliable piece of equipment. After seven years of use, it still holds up well, showing how durable the anti-tear material really is. The thickness provides great cushioning for yoga, stretching, or floor workouts, making it comfortable to use on hard surfaces without slipping. The included carrying strap makes it easy to transport to classes or the gym, and the lightweight design is convenient without sacrificing support. Even after years of use, the mat remains easy to clean and hasn’t worn down the way cheaper mats often do. While the surface may show some signs of age, the overall performance has stayed strong, which makes it an excellent value for the price. Pros: Extremely durable even after years, comfortable cushioning, and convenient with a carry strap included. Cons: The surface can show wear over time, it may feel bulky compared to thinner mats, and the texture may not suit those who prefer a firmer grip. A dependable yoga mat that lasts for years while staying comfortable and practical. For anyone looking for a durable, affordable mat, this one delivers excellent long-term value.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 30, 2025
M
Verified Purchase
Marissa
Lake Worth, US
★★★★★ 4
From a Non-Yoga enthusiast
Color: Purple
The first time I bought a Yoga mat, I plucked it out of the bin from either Ross or TJ Maxx. Then, I decided it wasn't for me and I sold the mat. So, I wouldn't know how to pick a good mat if I fell over it. I came here and purchased this one from the reviews. Again, I'm not a die-hard Yoga-er? Yogi? So I'm probably not giving it the "workout" it needs, but here's a few things I noticed. When I unrolled it, it was nice and tight from it's position. I had to lay it out, then lay on it to get it flat and ready to use. My dog was amused by this, but I'm not sure it counts as a position. It does dent. I've seen where others tear, but so far, mine hasn't yet. But dents? Yes. I can see this as more of a "when" rather than "if." The foam is soft-- it's bound to happen at some point. No noise noted. No squeaking or shifting, or "fart" noises. You can go about your routine in peace. I did notice a smell on my hands after. At first, I wasn't sure what it was, but it was latex-esque or plastic like. I didn't notice this during, but I did smell it after. To me, it's squishy and comfortable. Like I said , I briefly used it as a make-shift cot prior to it's official use, and I thought it was fine. Didn't move, and for what it is, I thought it was pretty thick. I Love the strap, I love the color, it'll do for now. Until it falls apart, I'm happy with it.
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Reviewed in the United States on September 1, 2019
L
Verified Purchase
Love inflatable pools
Lexington, US
★★★★★ 5
Squishiest impact absorbing mat I've seen
Color: Red
The size is smallish, and well advertized at 24" X 71", however the quality and padding is there, and at the price point I know it's a winner. It absorbs pressure and rebounds swiftly. It has a matt texture that is a bit grippy, which I prefer. I've paid a lot more for mats that didn't have this shock absorbing performance. I'm excited to own it.
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Reviewed in the United States on May 10, 2026
N
Verified Purchase
Natasha25
Lowell, US
★★★★★ 5
1/2” yoga mat. Great quality for the money.
Color: Aqua
I bought this yoga mat primarily for the 1/2” padding. I like the color and appearance with the ribbing on one side. I’m an older person and it’s difficult and painful to get down on my knees. This mat is comfortable and so easy to use. Doing my stretches and yoga are so much easier for me.
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Reviewed in the United States on June 1, 2026

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