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A couple of years ago, I developed an advanced version of the TPX – Tracking Pre-Regulator system for use in the Hicap and the Supercap from Naim. This sophisticated yet simple recipe has proved to be one of our best selling products to date in terms of numbers. Reports from customers are many and always effusive. The difference in sound quality and presentation when fitted with a TPR4 brings the Naim power supplies up to a whole new level and at a fraction of the cost of the new DR regulators from Naim.