What MP3 codex does the built in MP3 encoding use?
The ARM encoder which is Fraunhofer-based.
Does the Ripper function include and error-catching/correcting mode like EAC?
Yes. It's done a good job on my entire collection, including some scratched discs.
Can the Hard Drive be upgraded or a second one added by advanced users or returning to the factory?
It is even easier to add your own hard disk than it is on the car player. Simply install the new drive, boot from the included software CD, and hit the "restore to as new" option.
Ethernet sounds like a purchased separatly adapter is required? or is it built-in?
HPNA networking is built-in. Ethernet is not built-in, but I am successfully using a Linksys USB10T USB-to-Ethernet adapter that cost me $30.00.
Once on a local network, will it support streaming to anything other than Rio Receivers? i.e. PCs or Macs?
Yes, via HTTP. Details on streaming can be found
here.
Now please, if you wish to ask more questions about the Rio Receiver or the HSX-109, please post them on the appropriate BBS
here.
I will be locking this thread now, to encourage discussion on this topic be moved to the Rio Receiver/Audio Center BBS.