SKU: 67123410189

Pro-Ject Phono Box S3 B

Sale price$157.05 Regular price$174.50
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Ships within 48 hours · Estimated delivery Aug 5 - Aug 10

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For Your Every Summer RSVP, with Code: SUMMER15

Description

Pro-Ject Phono Box S3 BPro ject 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. Pro Ject have 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 their RS range of products until now. The Phono Box S3 B brings those features to an incredible new price point. High End Features The

Pro-ject 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. Pro-Ject have 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 their RS range of products until now. The Phono Box S3 B brings those features to an incredible new price point.

High-End Features

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.

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 the 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.

True Balanced Connection

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

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: 67123410189

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4.8 ★★★★★
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Joseph S. Morris
Natrona Heights, US
★★★★★ 3
They're ok, miss the resistor 3.0
Size: Large, Color: Black
I bought these because Under Armour stopped making the resistor 3.0 socks. These are fine, but the resistors are better. This model is a little too form-fitting, and I have to make sure they're situated on my toes properly, otherwise they'll sit between my little toe and the next one.
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Reviewed in the United States on June 13, 2025
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Amazon Customer
Port Orchard, US
★★★★★ 5
UA Socks
Size: Large, Color: Black
Great socks for summer. Just what I wanted.
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Reviewed in the United States on July 3, 2025
K
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KREG HANEY
Los Angeles, US
★★★★★ 5
Good Socks.
Size: Large, Color: Black
Good fit and comfortable socks.
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Reviewed in the United States on July 20, 2025
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Lassiter Denton
Draper, US
★★★★★ 5
Great quality.
Size: Large, Color: (001) Black / Black / White
Thickness and comfort are great. Quality is great and the same I would expect if I bought at the branded storefront.
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Reviewed in the United States on March 11, 2026
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Joseph Pratt
Massapequa, US
★★★★★ 5
Great product.
Size: Small, Color: (001) Black / Black / White
🙏🙏🙏
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Reviewed in the United States on May 16, 2026

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