If your speaker dock has an auxiliary-input jack, you can instead connect the iPad using that jack (see the next item). The drawback to this approach is that you lose any on-speaker controls that require a dock connection.

As with any device with an audio output, the iPad works fine with or any standard stereo system with line-level inputs. You just run a cable from the iPad's headphone jack (or, for better sound, the line-out jack on or a third-party audio adapter such as those from and ) to one of the audio system's inputs. If you use a dock or adapter, you may also be able to connect the iPad's own charger to get fast charging, as well.

Most iPod and iPhone FM transmitters, especially those designed for in-car use, are actually a combination of an audio accessory that grabs your player's audio-out signal via the dock-connector port and a charger that provides power via that port. As with the original iPad, we found that recent dock-connector FM transmitters are able to successfully grab the audio signal from the iPad 2 and transmit it over the chosen FM frequency. However, unless a transmitter was specifically designed for the iPad, its charging circuitry suffers from the same issue as other iPod and iPhone chargers--the accessory isn't able to charge the iPad while the iPad is in use, causing the iPad to display the message. (As with docking speakers, dock-connector FM transmitters designed to charge an iPod or iPhone should charge the iPad, very slowly, when the iPad is asleep, and even while the iPad is playing music with the screen turned off.)