Based on preliminary results, XM Satellite Radio Friday (Jan. 5) reported it added 1.7 million new subscribers in 2006 -- 442,000 coming in Q4 -- giving them a total subscriber base of 7.6 million. The year-end total fell short of the satcaster's projected range of 7.7 to 7.9 million, which had been lowered twice earlier in the year from an initial projection of 9 million.

Additionally, XM reported that it achieved positive cash flow from operations during Q4 '06.

"XM completed another year of significant subscriber growth, despite retail softness, and did so with continued cost controls, achieving positive cash flow from operations during the fourth quarter," said XM CEO Hugh Panero in a release.

Earlier this week, Sirius Satellite Radio reported it ended 2006 by meeting its latest Q4 guidance with about 6 million subscribers, an 82% increase over its 2005 year-end finish of 3.3 million subscribers.

Both XM and Sirius will report full Q4 results in February.

Additional reporting by Jeffrey Yorke