Speaking to the threat of free Internet streaming music shops like Pandora and Slacker and the rise of online subscription radio, Karmazin said that conventional radio -- not Sirius -- was facing the bigger challenge. "Today's satellite radio has gained share against terrestrial radio for a 15% market share," Karmazin said. That leaves conventional free radio with some 80% of the market and presumably more vulnerable to Internet radio and the shift in ad spending. Looking ahead, Karmazin promised to launch Sirius 2.0, which sounds like an expansion of broadcast capacity for additional channels like a Spanish language offering and a new generation of radios with so-called personalization features. Sirius shares were down 1.3% to $1.55 in morning trading Thursday. --Written by Scott Moritz in New York.>To contact this writer, click here: Scott Moritz, or email: firstname.lastname@example.org.To follow Scott on Twitter, go to http://twitter.com/MoritzDispatch.>To send a tip, email: email@example.com.