When Gretsch first released the RN-1 Renowns (the predecessors to the current RN-2s), they described the shell on their site like this:
"...Gretsch still uses the proven and unique Renown formula that combines North American Rock Maple with a
slightly softer maple species...."
You can see the discussion here:
(I posted this on another forum as well) I've been waiting for more info on the new Renown's, and I see that Gretsch finally added some to their site. However, I noticed that one section of their literature states: "...Gretsch still uses the proven and unique Renown formula that combines...
www.drummerworld.com
While Gretsch have since removed this language from their current site, I was able to find this about the RN-2s:
"Gretsch uses its tried and true Renown formula in the shells. A combination of North American Rock Maple
with a slightly softer maple are the key ingredients in the rich warm low end timbre of the shells."
You can find that on the Steve Weiss website:
Gretsch Renown continues its rich legacy with high performance features. The most important feature is the tonal qualities. Gretsch Renown has a powerful reputation of top quality sound. A perfect balance of rich smooth low ends and layers of sustained overtones make this kit pleasure to play...
www.steveweissmusic.com