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Cyrus Phono Signature phono preamplifier with PSX-R Mk2 Upgrade Power Supply.The Cyrus Audio Phono Signature is arguably the most advanced phono pre amplifier available anywhere in the world today. By providing an extremely smooth and stable DC feed, the PSX-R Mk2 helps the partnered component to achieve its the full potential... In this case adding more weight to bass and opening out the detail throughout the ranges.