If the 10,000 LPs are not stored in built-in wood cabinets with closed doors in the same room as the audio system then, yes, you should remove the LPs from the room.
As for 3,000 CDs I would think it would depend where there are located in regards to the fronts of the speakers and if the CDs are out in the open or housed/stored in a wood cabinet.
YMMV.
As for the LPs the difference in before and after removal of SPL surely could be measured using an SPL meter.
As for 3,000 CDs I would think it would depend where there are located in regards to the fronts of the speakers and if the CDs are out in the open or housed/stored in a wood cabinet.
YMMV.
As for the LPs the difference in before and after removal of SPL surely could be measured using an SPL meter.