Attendees listen to music with Polk Audio Inc. UltraFocus 8000... NachrichtenfotoAmerikanische Kontinente und Regionen,Apple Computer,Elektronik-Industrie,Finanzen,Horizontal,Kalifornien,Kopfhörer,MacWorld Expo,Mobiles Gerät,Moscone Center West,Musik,Nordamerika,San Francisco,Technologie,USA,ZuhörenPhotographer Collection: Bloomberg 2013 BloombergAttendees listen to music with Polk Audio Inc. UltraFocus 8000 headphones at the Macworld/iWorld conference at the Moscone Center West in San Francisco, California, U.S., on Thursday, Jan. 31, 2013. This year's conference, titled 'The Ultimate iFANEvent,' brings together attendees to celebrate Apple Inc. technology and learn more about products and services for Apple users. Photographer: David Paul Morris/Bloomberg via Getty Images