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DIAMOND XSTU21 USB 2 Channels Stereo Sound Tube

  • 2 Channels
  • USB Interface
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Learn more about the Diamond Multimedia XSTU21



Audio core



Operating Systems Supported
Windows 7 32/64bit, Windows Vista 32/64bit ,Win XP/XP64, Win 2000 ,2003
Linux 32/64
Mac Os X
System Requirements
System Memory : 512MB
Hard Disk Space : 20 MB
BUS : USB 2.0


Transparent Vacuum Tube appearance
Portable USB Audio
Plug-and-Play, use standard USB driver
A Fade-In-Out Blue LED for Power-On & Idle
Comply with USB 2.0 Full Speed
Stereo Microphone -In (also could be used as Line-In by turning off Mic AGC in Microphone Control Window)
Stereo Headphone-Out

It has never been easier to get crystal clear stereo sound on the go. The Diamond Sound Tube let's you quickly connect your PC, Laptop, or Netbook to virtual 3D sound through a USB 2.0 port, providing home-theater quality entertainment through headphones or stereo speakers. The Diamond Sound Tube Audio device is Plug and Play for Windows, MAC and Linux Operating systems so there is no worrying about installing any software. Simply connect the Sound Tube device and get headphone sound that imitates multichannel speakers. Communicate with amazing clarity in online chats and gaming by adding a headset and microphone. The pocket size Sound Tube is the most convenient way to dramatically improve your music, movie, and game audio.

Manufacturer Warranty

5 years limited
5 years limited

Quick Info


  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years

Customer Reviews of the Diamond Multimedia XSTU21

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  • Christopher F.
  • 3/1/2013 2:09:27 PM
  • Tech Level: High
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsawesome little sound card

Pros: F----ing great! this thing needs no driver setup in linux and is picked up in distros automagically as far back as 2009...

Drives LOUD/Clear sound to my sony studio headphones-

Cons: none! works exactly as described.

Other Thoughts: would buy again if this one ever broke...

Did you find this review helpful? Yes No

  • Rick B.
  • 4/16/2011 1:21:44 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week

2 out of 5 eggsDirect comparison

Pros: NONE!

Cons: I did a side by side comparison to the Startech ICUSBAUDIOB 2 channel usb sound card. What a joke! It was not even close. The Diamond was washed out. I have been doing a to b comparisons for 30 years now and many need more then one time to compare as to not make a hasty decision. This was just plain obvious. The Startech uses a C-Media CM108 chipset while the Diamond uses a Via Technologies VT1610 chip set. This has to be the reasoning for my decision. Needless to say the Diamond goes back for return.

Other Thoughts: The 90 degree angle is also stupid as it won't even plug into the back usb ports. I barley got it plugged into the front port.

1 out of 1 people found this review helpful. Did you? Yes No

  • Edmund F.
  • 3/23/2010 10:39:38 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

2 out of 5 eggsCould be better

Pros: works well enough to plug in headphones - simple power speakers (no sub woofer)

Cons: Makes a terrible feedback noise when system is powered down. Need to unplug when power is off to prevent it.

Other Thoughts: on the go, OK. back-up sound card, no way

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  • Fred B.
  • 1/8/2010 9:25:15 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggsworks ok

Pros: Doing what it said it would

Cons: none

Did you find this review helpful? Yes No

  • Brian A.
  • 1/7/2010 5:03:16 PM
  • Tech Level: Somewhat High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsWorks Good

Pros: Sounds good.

Just plug it and and works

Cons: None

Other Thoughts: Needed a second sound card for my laptop

Did you find this review helpful? Yes No

  • Matthew S.
  • 10/31/2009 8:27:09 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month

5 out of 5 eggsThank you Diamond!

Pros: Plug and play - advertises this for all OS's but I have only tried it with Linux and it works well!

Better sound quality than my onboard laptop intel card

Mic in

works fine with USB 1.1 ports (like the ones of keyboard hubs)

Best 30 bucks I have spent in a while!

Cons: I really can't find anything wrong. If you want me to be really picky I would say the thing looks dorky and the light is annoying at night.

Other Thoughts: I bought this because I broke my audio jack by tripping over my headphones. I chose this usb sound card for two reasons:

1. Like the OP said, I love linux and like rewarding manufactures that advertise support for linux as well

2. IT'S CHEEP! - need I say more?

2 out of 2 people found this review helpful. Did you? Yes No

  • Elliot F.
  • 9/13/2009 12:59:21 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week

5 out of 5 eggsGood sound, linux friendly

Pros: 1.) mic-in
2.) Good sound quality
3.) advertised as linux compatible(!)

Cons: 1.) The LED is too bright and does an annoying fade-in/out when it is idle.
2.) no optical out (but I knew that when I bought it.)

Other Thoughts: I bought this one because it advertised mac/linux(!) compatibility on the back where the other card I was considering only talked about windows. I'm sure the other card was linux compatible as well, but I like to reward linux-friendly vendors.

While I am not entirely sure I like the form factor (it seems a bit precarious), it has two advantages over alternatives:
1.) it does not interfere with usb ports that are directly to the left/right of it or below it. My other usb soundcard was wide enough and thick enough that it caused problems with anything near it.
2.) it uses a standard mini-usb cable in case you want more length, rather than needing a usb M-F extension cord. I use mini-usb to charge all my cell phones, so I have plenty of them.

3 out of 3 people found this review helpful. Did you? Yes No

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