I recently got a pair of Super Alnico monitors and they took a long time to break in. I usually find it hard to believe a speaker needs a long break in…. I also have a REL r305 and is set around 60hz.
After some trial and error with speaker and sub placement I finally have it dialed in well. I am usually a grill on guy but last week I decided to try them without grills.
Much better sounding. Grills on those killed the imaging