Rare and hard to find.
This works.
The Symphony Pro patented QRT Quantum is the technology that Nordost acquired for their QX2/QX4 products.
http://nordost.com/qrt/qrt-power-products.php
Many review links can be found here.
http://www.head-fi.org/t/306463/quantum-symphony-pro-line-conditioner
Will add photos shortly.
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