I just received my Sonor 3007s yesterday! So I should know this one...
The Sonors are all maple, but they tell you the inner plies are Asian maple, and the plies on the outside and inside (that you see) are Canadian maple.
I honestly don't know how you could verify this, but that's what they say.
I'm very happy with these drums (I've never bought "mid-level" drums before until now). I outfitted it with Remo vintage Emperors top and bottom, and put a PowerStroke 3 on the kick, and in the last few hours of futzing with it, I can make that kit sound great for jazz, high rock, and low rock, which covers just about everything. And I thought I had to immediately upgrade the snare drum - not so! After messing around with it before declaring "I like it now" - I discovered it sounds identical to my Ludwig Acrolite that was on the other side of the room!
Someone speculated (not just here), that perhaps everybody's "Made in China" drums are manufactured in the same plant. I wouldn't be surprised. Back in the hey-day of the VCR, I found out that Matsushita was making ALL the VCRs for all the brands, except for Sony back then!