Depending on who did the balancing, it might still be out. The other source of thrum-thrum kind of noise is a tire that's out of round. A lazy tire shop balance person might not bother to look at that or fail to alert you to it. And the tire will still be balance-able even if it's a little out of round.

__________________
DS
2010 CL550 - Heaven help me but it's beautiful
87 300D a labor of love
11 GLK 350 So far, so good
08 E350 4matic, Love it.
99 E320 too rusted, sold
87 260E Donated to Newgate School
www.Newgateschool.org - check it out.
12 Ford Escape, sold, forgotten
87 300D, sold, what a mistake
06 Passat 2.0T, PITA, sold

Las Vegas NV