Audio gear maker NuForce is showcasing two new models of stereo earbuds aimed at mobile device users, offering the larger but lower-powered NE-600X earbuds for budget-conscious consumers and an improved version of its existing NE-700X called the NE-770X that features non-metallic drivers that are acoustically inert for natural response in a lightweight polycarbonate enclosure that the company says is ideal for mobile users.