Anyone know whether the 990 can apply DPLIIx to multi-channel SACD or DVD-A sources?

Afraid not. The 990 does not support surround processing of the multichannel analog input.

Gonk,

Does it apply bass management to them? I ask because I'm thinking of getting the HD-XA2 and using the analog connections for True HD et al, and there seems to be some issues with the way the XA2 puts out the bass/lfe. Pretty long thread over on AVS in the HDDVD hardware section:

http://www.avsforum.com/avs-vb/showthread.php?t=823837&page=1&pp=30

Thanks,
Brian

Yes, the 990 will apply bass management to the 7.1 Direct inputs so you would want to disable the XA2's bass management (set all speakers to "large" and the sub to "on"). It will also provide channel trim and delays, so you don't need to set those in the XA2.

Great Stuff!! As always Gonk, Very much appreciated!!!

Glad to help, Bri.