Speaker massage ...

Or just play some bass heavy music, Bob Marley usually works for me. 😎

Invite your neighbors over for a eurobeats dance party and turn it up! The bass speakers benefit the most. 

I only had one pair of speakers that changed during break-in. It only took 24 hours. Just playing music the drivers will go through a million cycles in a very short time. 

when doing the OOP trick during speaker burn-in, best results [the most cancellation/reduction in volume] are gotten by summing your test signal to mono first, if it is not already mono.

I can also advise just to listen to them and watch them change, I found that quite enjoyable. You’ll enjoy them out of the box, but you’ll notice over time some changes for the better and I think that’s part of the journey. Trying to break them in quickly means you’ll lose the education you’ll get on the development of your speaker, which could be invaluable when identifying what you like/dislike for any future purchases.