Since iOS’ 4.2 update by Apple, Micromega’s Airstream seems to be the only high quality device allowing to connect, via WiFi, an Ipad, iPhone or iPod Touch with a Hifi system. Airstream comes equipped with a toroidal transformer of Hifi quality, a boosted and regulated PSU instead of an SMPS, and an accuracy clock to ensure the quality of data flux.
A specialist in digital transmission, Micromega is a french HiFi brand founded in 1987. They notably invented the first HiFi CD player with a topside loading system.

Micromega has been producing HQ HiFi devices : integrated and naked stereo amps, CD players, tuners, etc The airstream is　available　for 147,000 yens in audio electronics shop, such as Dynamic Audio in Akihabara. Micromega is distributed across Japan by Take 5.