I have owned many pairs of speakers over the years and all benefitted from break in. I use the Isotek System Enhancement CD to break in all my equipment. An easy way to break in speakers is to have them facing each other and wired out of phase. You can crank the volume without it being very loud and it gives the woofer surrounds a great work out. I have never blown any speaker.
Speaker Break-in
A search brings up lots of good, past discussion on this subject, so I have a good idea how to go about this. I have new speakers coming next, the manufacturer says this: "You shouldn't need a break in period the surrounds are already very compliant," In turn, the dealer says this: "Yes, just about every speaker needs break-in, less so than other models as they don’t feature internal amplification, but they’ll still benefit from a couple hundred hours of break in"
Speakers are Legacy Signature Se...Any thoughts?