I have a D-18 GE as well. I was shocked at how easy it is to record the thing. It just sounds “right.” I just posted in another section how I am a sucker for complex overtones, but I usually end up coming back to Mahogany. Mine likes a subtle touch too, but I can whomp on it when needed and it just seems to love it.
I’ll see if I can attach something… when I first got the guitar I recorded it solo at the request of a co-worker. I used two CHEAP condenser mics: one on the lower bout and the other at the 12th fret. There are no effects or eq on the sound except a boatload of reverb (trying to match the sound of Alex Lifeson’s 12 string live sound as much as I could). I think the sound of the guitar just jumps for such a quick and simple recording.
Edit: Ooops, mp3s can’t be directly uploaded… bummer. Take my word for it… they record great.