Sewell SoundBox, External USB Sound Card, 7.1 and 5.1 Channel Audio

Sewell Part # SW-29545


4.5 (13 reviews)

In Stock

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Starting from: $14.25

"They were the only business that had exactly what I wanted at a reasonable price. It shipped immediately and works well."


7.1 Channel External USB Sound Card

Upgrade your desktop or laptop sound card with the brand new Sewell SoundBox. A 7.1 channel audio external sound card.

Ease of Use

Using only a USB 2.0 connection, this External Sound Card connects to your computer to deliver incredible external audio capabilities. You can also use the SoundBox between multiple computers without having to open up any of them.

USB Soundbox Connection Diagram

Digital and Analog 7.1 Channel Audio

This USB Sound Card supports analog and digital audio. It will support simple 2 channel stereo, and just as easily push out 7.1 channel audio. Instead of taking the time and money to open your computer and put in a PCI sound card, The SoundBox will turn your laptop or desktop into a home theater-ready audio solution.

Record in Stereo

The two microphone inputs provide a solution for any audio application requiring multi-input capability. The SoundBox supports 44.1 KHz and 48 KHZ sampling rates for recording and playback.


  • Small and compact for portability; about the size of a deck of cards
  • Full analog 7.1 audio through 3.5mm jacks
  • Digital 7.1 audio supported through Fiber Optic S/PDIF input and output
  • Record in Stereo through 2 Microphone inputs
  • Easy-to-use volume control buttons
  • Full-duplex recording and playback
  • Analog supports 48/44.1 KHz sample rate for both recording and playback (S/PDIF in and out only support 48 KHz sample rate)


  • Upgrade the sound card on your laptop or desktop to support full 7.1 audio, for games, music, movies, etc.
  • Record using full stereo
  • Turn your computer into a great Home-Theater PC
  • ...and Anything else you can think of


Mfg. Part Number

  • SW-29545


  • Sewell


  • USB 2.0 Compliant
  • Full-duplex Recording and Playback
  • SPDIF Optical Digital Input and Output
  • 3.5mm Jacks for Analog
  • Analog supports 48/44.1 KHz sample rate for both recording and playback (S/PDIF in and out only support 48 KHz sample rate)
  • Supports Windows 2000, XP, 2003, Vista, 7
  • *Windows 8, 8.1 (32/64 bit) - limited functionality 2.1 audio output only
  • *Mac OS with limited functionality (2.1 audio output only, only supports analog audio, no Toslink in OSX), no driver required for Mac OS


  • Drivers and Support pages available under the support tab

Package Contents

  • 1x USB Sound Box
  • 1x USB Cables
  • 1x Driver CD
  • 1x User Manual

Customers have bought these items with this product


13 Total Reviews -

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Most helpful reviews

Good little sound box

Norm - 8/18/2011 1:41:02 PM

7 found this review helpful

Pros: Good sound. Analog and digital out at the same time.

Cons: Need more instructions on installation of hardware versus software. And link to download to the latest version of software.


Excellent and Recommended

Brooklyn Resident - 8/21/2012 6:03:55 PM

4 found this review helpful

Pros: I bought this to get SPDIF out of my Dell laptop, and it works beautifully - just plug and play in Windows 7. I also verified the SPDIF input, and it works also. I haven't tried the 7.1 aspects - the whole point was Laptop with DTS/Digital Soundtrack -> SPDIF -> Home Theater Amplifier, which can do the decoding for me. In my chain therefore we have: Laptop (Win 7) --> USB --> Sewell Soundbox --> SPDIF (out) --> SPDIF (input) on Home Theater Amplifier --> Decoding --> Speakers --> :-) The soundbox is much smaller than the pictures suggest, it's quite dainty and measures about 4 inches by 2 inches, about the same as a pack of cigarettes. No problems though - it's quite sturdy.

Cons: A gazillian lumen bright BRIGHT blue LED on it! Nice to know it's working, but I've taped over it - if you're using it for home theater, it will brighten the room quite a lot. It's not a killer, since a piece of tape "fixes" it!

Other: All in all an excellent little box, great value for money, does exactly what I wanted it to with no setup. Fully recommended. I relied on other comments on this and Amazon (where I bought it from), and thought I'd add to help any future buyer. Enjoy!

incomplete info

pat - 1/3/2013 12:30:13 PM

2 found this review helpful


Cons: The "user manual" was inadequate and I needed assistance to explain something as basic as the device needed to be plugged into another source in addition to the computer, and that additional plug ins would be needed depending on desired connection. It does enhance the audio on my computer and I'm hoping to connect it up to other source systems.


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Most recent reviews

Mic does'nt work well , the problem I have is ..the sound from mic I cannot hear even I turn max ., the sound for music is good

Melissa - 7/28/2015 3:07:22 AM

Great product, great price

Nozmo - 4/7/2015 2:03:54 AM

It was just what I needed to add full audio I/O to a tablet I needed to re-purpose. It works great and Amazon had it for a terrific price. When I need another one I'll definitely try the Pro version.

Anonymous - 3/13/2015 7:46:33 PM

This small unit worked right out of the box on my 5.1 Surround Sound Speakers. When my desktop failed and I wanted to connect the 5.1 Speakers to my Laptop USB Port, this unit was all I needed. It saved a $200 speaker set for a $25 cost of the SoundBox.

It just works

Anonymous - 12/5/2013 11:24:38 AM

Plug it in, it starts working - that's rare for anything to do with a Hackintosh!

Anonymous - 2/20/2013 12:50:24 PM

all good at a reasonable price.


See all 6 questions


Does this external sound card decode dolby digital/dts on the optical in?


No, this converter is not Dolby or DTS Certified and cannot decode it.

6 out of 9 found this helpful.

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Could this product be the link between my blu-ray player and my Logitech z506 surround speakers? My blu-ray player has an optical output and my speakers have 3x3.5mm inputs for the 5.1 surround sound.


Unfortunately no, it wouldn't work that way. This converts USB sound from a computer to analog output, it can't convert a toslink to analog output.

5 out of 7 found this helpful.

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What is the output impedance at each of the the 3.5 mm phone connectors?


Front, surround, center/bass, and back output are all high-impedance ouputs, and can support high-impedance input (10Kohm) devices. The headphone output is low-impedance, and can support 32 ohm impedance devices.

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Driver Downloads

Windows Installer - For Windows 2000 / XP / 2003 / Vista / 7 (32 and 64 bit)

Driver - Windows 8 /7 / Vista/ XP - Windows driver for Sewell SoundBox

Windows 10 Driver - Windows 10 Driver for Sewell SoundBox