slwiser 0 Report post Posted November 12, 2007 I just found a reference to the EXH-313 as using some new audio technology called UST or Ultra Sound Technology. I can't find anything that I can read and understand about this UST. Has anyone heard this headphone and can compare it with one like the Ultrasone Edition 9? I found the reference on the site called He and Bi headphones. This site rated the EXH-313 with the Edition 9 and the Stax 707s, interesting. Thanks Share this post Link to post Share on other sites
