XM upgrades to 5.1

XM Satellite Radio and Neural Audio Corporation said XM in March will begin broadcasting some of its music channels in 5.1 surround sound. The new offering, XM HD surround, uses Neural Audio technology to provide six discrete channels of full fidelity digital audio. Denon, Onkyo, Pioneer Electronics (USA) Inc. and Yamaha plan to introduce home audio systems capable of playing XM HD surround.