I think it depends on what you are trying to achieve. If you are looking for bass management for a DVD-Audio or SACD player only, you'd want to put it between the player and the pre/pro. In that case, the pre/pro's bass management would still be used for all other sources (DVD video player, CD player, LaserDisc player, etc...). It is also possible, however, to put it between the pre/pro and the amp and disable the pre/pro's bass management (if the pre/pro's bass management for stuff like digital inputs is disappointing). I think Outlaw suggests the first (before the pre/pro) more than the second in their manual, but that's likely because the ICBM was conceived to provide bass management for DVD-Audio and SACD players rather than as a bass management add-on to a pre/pro.