When I set up a W124 Benz with the imprint system, I had to move the microphone to at least 7 different locations. It seems that the the Imprint makes corrections to sweeten the tuning, depending on which listening location you specify when starting the system. It wasn't a reference system, and the tuning was sufficiently good (time correction, eq and x-over) to sign off on the car. I didn't take the time to try and tweak the parameters arrived at by the Imprint system. Don't know at this time if it's possible. I've got an old F355 coming in next week for a CDA-9887 install. I'll provide an update after that one's in the bag.