Pioneer offers with the HTP-GS1 a surround sound system designed for the Microsoft Xbox 360.
The Pioneer HTP-GS1 is a Dolby Digital & DTS 5.1 Surround Sound system with microphone based automatic room calibration. The HTS-GS1 has new Sound Retriever DSP technology designed to replace lost information and dynamics in compressed music files like MP3, WMA, AAC.
The remote control is Xbox 360 compatible. The design of the HTP-GS1 is also adapted to fit to your Xbox 360.
More details on the Pioneer HTP-GS1 product page. Via Hardware Zone.
The Pioneer HTP-GS1 sells for $474.99.