The 18-49 numbers were the best in 6 years, though the 37.6 million viewers still trail Undercover Boss’ 38.7 million 2 years ago.

via NBC:

• The season 2 premiere of “The Voice” (16.3 rating in adults 18-49 and 37.611 million  viewers overall)scored the highest rating for an entertainment telecast on any net in six years since the post-Super Bowl telecast of “Grey’s Anatomy” on February 5, 2006 (16.5).

• “The Voice” is up +47% in 18-49 rating and +40% in total viewers versus Fox’s “Glee” in 2011 on Super Bowl night (11.1 in 18-49 rating, 26.806 million viewers overall).  Versus two years ago, “The Voice is up +1% versus CBS’s “Undercover Boss” on Super Bowl night in adults 18-49 (16.2 in 18-49).

• In total viewers, “The Voice” marks NBC’s best post-Super Bowl program since Friends on January 28, 1996 (52.9 million).

• The 16.3 adult 18-49 rating and 37.611 million P2+ viewers for the season 2 premiere of The Voice accounted for NBC’s top results for an entertainment telecast since the Friends finale on Thursday, May 6, 2004 from 9-10:06pm (24.9 in 18-49, 52.5 million viewers overall).

• The 16.3 18-49 rating for “The Voice” marks a series high for the show, up +186% versus its previous series high for week 2 of the show on Tuesday, May 3, 2011 (5.7 A18-49 rating, 9-11 p.m.).

• ‘The Voice’s” 37.611 million total viewers were +161% above its previous series high in on Tuesday, May 31, 2011 from 10-11pm (14.405 million), following the season premiere of “America’s Got Talent.”

• In 7-11 p.m. primetime averages, NBC delivered a 36.3 rating in adults18-49 and 97.7 million viewers overall, for the highest rated night on NBC in 18-49 since Sunday January, 28, 1996.

• It’s NBC’s best night in total viewers in the history of people meters.

• The special edition of “Late Night with Jimmy Fallon” averaged a 2.5 rating in adults 18-49 rating and 6.166 million viewers overall from 11:56 p.m.-12:56 a.m. ET) .

• Fallon is up +400% from its season average in 18-49 and up +256% in total viewers (0.5 in 18-49, 1.734 million viewers overall).

• This easily stands as Fallon’s highest-rated telecast to date in both 18-49 rating and total viewers.

• Compared with the show’s previous series highs (1.9 in18-49 Rating, 3.967 viewers overall on January 22, 2010, following Conan’s final “Tonight Show”), Fallon was up +32% in 18-49 and +55% in total viewers.

Source: TV By The Numbers