Features of the 555PS include:

* seven regulated power supplies including separate one for the clock circuitry.

* five secondary windings on the transformer.

* a transformer that is 40 per cent larger than that in the XPS2

* separate dedicated analogue and digital output sockets (Burndy) to minimise high frequency noise modulation of analogue supplies.

* backward compatibility with the CDS3 and CDX2.

* Can be used to enhance the performance of the Naim HDX hard disk player and the Naim DAC

* a low resonance case with isolating feet.