I can help. I have the 38A and have successfully played (and enjoyed) the same Doors LA Women DVD-A. DVD audio uses only the analog output -- it won't work at all with the digital coxial cable (which you'll still use for DVD video, movies, HDCD, etc.)
Here's how to hook up your 38A for DVD-A: In the centre of the 38A you'll see four RCA jacks together marked: sub, centre, LS and RS -- these jacks, along with two of the anlaog L and R RCA jacks make up the 6 RCA connections needed for DVD-A. You must have a reciever with 6 analog inputs in order for this to work. (I use a Marantz 14EX.) The 38A will then decode the DVD-A signal and then send it to the appropriate speakers. And for best results, you should have 5 FULL RANGE speakers, or at least 4, and a good sub.
Even with my very close to reference quality set-up (Marantz 14EX, Kef Reference 4 in front, Kef Reference 2 in rear and Kef 200 Centre with the big Veloydyne 18HGS sub, I am only moderatley satisfied with DVD-A. IMHO, most of the DVD-A recordings (I own about 12) are not very good -- poorly recorded with unnatural separation. The only three discs I really like are: Doors LA women, Beuna Vista Social Club and Swan Lake.
I also have a high end two channel SACD system running through the same front speakers and it totaly stomps on the DVD-A. I know it's not fair to compare my Sony SCD-1 and Aranov tubes to my HT setup, but still there is a HUGE differnce. That said, I do occasionally enjoy DVD-A and the Pioneer is wonderful unit for video.
By the way, I put a Black Diamond Racing shelf under the Pioneer and it really helped. Video sharpened up and audio lost some of the digital edge.
Hope this helps --sounds like you'll need to get a reciever with 6 channel analog inputs and some more RCA cables.
Let me know if you still have any questions. --Lorne