I was using a XM with full LM4562's and I found they sound pretty much the same but different if you know what I mean they have different sonic signatures.. They are both awesome cards. The Prelude has many more features though. You can;t use the Preludes adapter on a Coax port on a device not meant for them. You will just damage the connector and the jack. I found some have trouble with inserting the optical adapters into the Prelude...the don't seem to realize there are very tiny plastic caps on the pointy end of the adapter that need to be removed prior to inserting them into the Prelude. What will decide if DTS will sound better then the Prelude in analog is again the unit your connecting it to. Right now the Prelude decodes DTS BUT only over analog. The Digital side of it is DTS-Connect and that would depend greatly on the receiver or speaker system your connecting to. Worth some tests when the driver is released.