Buena Park, Calif. - Yamaha added a new model to its selection of iPod-docking systems.

The company, which entered the docking-speaker market in 2009, offers a variety of single-chassis and three-piece systems, some with FM tuner and some with FM tuner and CD player.

The new model is the single-chassis $169-suggested PDX-31 with dock on top. It lacks tuner or CD player but is certified for use with iPhones and iPods. It also features a stereo mini jack input for connection to other-brand MP3 players and to other audio devices.

 The PDX-31replaces the $199.99 PDX-30 which is similar, but lacked the mini jack input.

Other features include auto power off after a certain amount of time to conserve energy. The PDX-31 also remembers its volume level when an iPod or iPhone is undocked.

Like its predecessor, it features two 3.25-inch full-range drivers.