Hello
Information found on line 6 forum, about the A/D D/A converter used in HD500, just in case you are interested
http://fr.line6.com/support/thread/79687
http://www.cirrus.com/en/products/cs4272.html
The same is used in the following gear (information not from me)
Line 6 pod X3 live;
-Avid eleven rack;
-Apogee DUET/ONE;
-Indigo-Echo I/O;
-Apogee Ensemble
-Echo Audiofire 8:
-Mbox3 Pro;
-FALCON 50 FM;
-Yellowtec Puc2;
-Behringer ddm 4000 (as one in many, many converters used in this gear)