Pro-Ject Uni Box S3 Integrated Streaming Amplifier
SKU: 44271956117

Pro-Ject Uni Box S3 Integrated Streaming Amplifier

Sale price$647.55 Regular price$719.50
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Ships within 48 hours · Estimated delivery Jul 6 - Jul 11

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Description

Pro-Ject Uni Box S3 Integrated Streaming AmplifierAnalogue and streaming done right The Uni Box S3 dares to break away from the norm, redefining what a modern streaming amplifier can be. While many amplifiers are dominated by deeply integrated streaming tech compromising their core design the Uni Box S3 takes a different path. The Master of Analogue & Digital The Uni Box S3 masterfully bridges the worlds of analogue and streaming. Your analogue sources like turntables are not digitised, preserving

Analogue and streaming done right

The Uni Box S3 dares to break away from the norm, redefining what a modern streaming amplifier can be. While many amplifiers are dominated by deeply integrated streaming tech – compromising their core design – the Uni Box S3 takes a different path.

The Master of Analogue & Digital

The Uni Box S3 masterfully bridges the worlds of analogue and streaming. Your analogue sources - like turntables - are not digitised, preserving their rich and lifelike sonic character. With a fully analogue pre- & and power amp design, every nuance of your music is delivered with breathtaking punch and dynamic precision. At Pro-Ject Audio Systems, our mastery of analogue hardware design allows us to craft an astonishingly powerful amplifier within the sleek, compact aluminium case of the Uni Box S3. All this power remains usable entirely without a mobile app or the need to constantly update software.

Market leading streaming

Partnering with WiiM, the Uni Box S3 streaming technology is powered by the industry leading WiiM OS™. The Cirrus Logic CS4344 DAC offers a high quality resolution of up to 24bit and 192kHz.

With the Pro-Ject Home app you control the streaming options on input 8 - the streaming input. Setting up the WiFi connection is a breeze. Just open the app and it automatically detects your new Uni Box S3 and walks you through the setup process. Comfortably reset the WiFi connection via long press of the Stream button on the front panel.

Technical Specifications

  • Power output: 2x 23W / 40W at 8 / 4ohms (1% THD)
  • Frequency response (20Hz - 20kHz): < 0,4 - 0,9dB @4ohms
  • Channel separation: - 67dB at 10kHz
  • Signal to noise ratio: 94dB (9dB-‚A‘ weighted) @4ohm
  • THD: < 0,05% at 10W / 4 ohms
  • Headphone amplifier: 70mW at 32ohm (1%THD)
  • Analogue inputs: 2x pair RCA, 1x phono MM (RCA)
  • Digital inputs: RCA coax, 2 x Toslink, eARC, WiFi/BT
  • Power amplifier: Texas Instruments TPA3221DDV
  • DA-converter: Cirrus Logic CS4344 24bit/192kHz
  • Variable output: 1x pair RCA
  • Speaker connectors: 4mm Ø banana plugs, spades connectors or naked wire
  • Wireless connectivity: Wi-Fi 5, 802.11 b/g/n/ac 2.4 G and 5G dual bands, Bluetooth 5.1, SBC and AAC
  • Power supply: 20V/3A DC; 100 - 240V, 50/60Hz
  • Standby Power consumption: < 0,5 watts
  • Dimensions WxHxD: 206x55x153 (176mm with sockets)
  • Weight: 1100 g 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: 44271956117

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monte
Pawtucket, US
★★★★★ 5
Champion is my favorite
They fit my cub cadet
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 18, 2026
N
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Noba Henderson
New York, US
★★★★★ 5
Flat tire… try this.
Size: 1 Gallon + Tool, Set name: Small Tire/Bicycle Formula
For husband, that’s what he puts in our tires great price and works well
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
C
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Chris
Natrona Heights, US
★★★★★ 5
Go Ridding and Go Flatless with QuickStrike tire sealent
Size: 1 Gallon + Tool, Set name: Off-Road Formula
I’ve tried several tire sealants over the years on my ebikes and scooters, but FlatOut QuickStrike is by far the best I’ve used. From the moment I added it to my bike tires, I noticed a difference—it’s incredibly easy to install, and you don’t have to convert to tubeless to benefit from its protection. The formula is thin and spreads quickly, sealing punctures almost instantly so you don’t lose much air. What I feel that really stands out is how effective it is. I ride my ebikes through rough terrain with lots of thorns and debris, and since using FlatOut QuickStrike, I haven’t had a single flat ( unlike before ). Even when I’ve picked up multiple punctures, the sealant has handled them all without a problem. I feel that the peace of mind it gives me is priceless, especially on long rides or commutes where a flat could ruin your day ( and It has in the past ). Another big plus is that it’s a one-time application—it won’t dry out or turn into a mess inside your tire ( like that Green Stuff ). It’s also safe for both tubes and tubeless setups, and works well in my 20 inch and 14 inch tires. I’ve used it on my ebikes and scooters and the results have been consistently impressive. Make me feel confident of the durability of my tires on my ride. I bought the gallon bottle because I have a few ebikes and scooters. this stuff works great! If you want to spend less time fixing flats and more time enjoying your ride, this is the sealant to get. Highly recommend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 14, 2025
M
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Mama-Corvi
Birmingham, US
★★★★★ 5
Fat tire savior
Size: 1 Gallon + Tool, Set name: Off-Road Formula
The best fat tire and dirtbike sealant we have found and love the gallon size. Pump clogs but clears with a strong push and love that it is water cleanup.
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Reviewed in the United States on April 16, 2026
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JRTX
Birmingham, US
★★★★★ 5
Worked perfectly for me. Sorry I waited so long.
Size: 1 Gallon + Tool, Set name: Off-Road Formula
I was clearing a field full of mesquite trees, and my tractor tires were getting destroyed. Mesquite has nasty 3-inch thorns, and I was plugging tires constantly. Eventually, all four tires were flat at the start of each day. These tires had been plugged more than 10 times each. I bought FlatOut Quick Strike and followed the instructions exactly. The pump dispenses about 1 oz per pump, so I put 30 pumps in each tire, and the bottle was mostly empty by the time I finished. Typical with any pump dispenser it was also difficult to get the last bit out of the bottle using the pump. It’s been a week now. One tire has lost about 1 PSI, but the other three are still holding exactly where I set them. Considering how badly these tires were damaged, I’m impressed so far. This is the first time I’ve gone more than a day without dealing with flats in that field.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 13, 2026

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