Teradak Teralink X2 USB-S/PDIF transport interface
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50.00
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attenuated 3db

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For sale is my like-new Teralink X2 USB-S/PDIF transport interface, perfect for a quick, very noticeable improvement in sound quality if you are going from a computer USB port to the USB input of a DAC that also has an S/PDIF input, be it coaxial, optical, BNC or the IIS standard.  This slick little device has been eclipsed in attention by newer USB-S/PDIF converters, but it still compares favorably with more expensive options:
 
http://www.tweak-fi.com/apps/blog/show/5029064-the-usb-to-spdif-shoot-out-review-part-2-teralink-x2-vs-jkeny-s-modified-hiface-vs-audio-gd-digital-interface
 
http://www.digitalaudioreview.net.au/index.php/audio-reviews/digital-source-reviews/item/217-teradak-teralink-x2-usb-audio-converter
 
Here is the detailed information from the manufacturer Teradak along with internal photographs of the device:
 
http://www.teradak.com/en/product_view.asp?ID=203
 
You can use an external power supply (a "wall-wart", battery or more expensive regulated unit) with it or simply power it from your USB line (what I did), and the 1 part-per-million TCXO clock really helps stabilize the signal coming from your computer USB port before passing it along to the DAC through your choice of connection options (I used coax).
 
I used this with my Maverick Audio D1 "tube magic" DAC/preamp, and it immediately made for a huge improvement in sound quality, much more than what I had achieved through swapping tubes and op-amps.  It also made a substantial difference with my Audio-gd NFB-3 DAC, because the S/PDIF input is superior to the USB input.  I moved up to an Audio-gd Digital Interface, but the Teralink X2 is  a solid performer for a relatively low price.  Anybody with a DAC with a USB and S/PDIF input who is currently using the USB port should notice an immediate improvement in sound quality.
 
I got a shipping estimate today and discovered that US Postal Service Priority Mail is the fastest, most cost-effective way to send the heavy-duty corrugated cardboard carton with bubble wrap that I packed the unit in.  It is roughly $10 to any CONUS address, and has 2-day delivery (although no online, in-transit tracking).  So I will sell it for $50 shipped in the U.S. and absorb the PayPal fees myself. 
 
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attenuated 3db

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Another price drop bump. Quick, low-cost boost in sound quality for someone currently using a DAC USB input.
 
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