Hi Matt, I talked to steve N. over this week, The final drives are a great accomplishment by steve, However, though you can use them on the active pre-amps, steve said you can also use the final drives on the dacs, or cd-players that have a volume control on them, I would bet you money, If you put the final drives on the Aeris, or ODSE, or any of the dacs that you have that has a volume control versus, just your prized Roland active pre-amp by its self, you would likly sale the Pre-amp!, LOL!, after I talked to steve, I am interested in his final drives to use with source componets direct to amps, being the final drives are a true Balanced circuit,and passive, not needing any power from the wall, and the fact they break the ground plane, It's a win-win situation!