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“While the cheaper model is sleek looking, but plastic and lightweight, the more manly NWZ-ZX1 is hewn from aluminium alloy and has a leatherette back panel that makes it easier to grip. A large chunk of the additional cost is down to the use of specialised components and an optimised electrical circuit layout, which Sony says combine with the rigid machined body to offer maximum resistance to electrical interference, and deliver ‘uncompromised audio performance”