Question to those believing in speaker break in

@erik_squires +1 - if you stream then select an Internet radio station and let it play 24/7 at moderate volume. Several days should be enough. Me, I'd just do my regular music listening. No need to be neurotic about break in!

OK.

But what about the distance between the speakers when placed front to front?

The sound will be much more quiet when placed without any space between. 

Yes, face-to-face reverse polarity will work - but what fun is that! I'd rather set them up normally and enjoy some music!

@jasonbourne52 ​​​​​​

Problem is that I have to listen at low volumes and that way it would take ages.

And that is why I am wonder about the space between the speakers. 

You don't need to be playing loud. To break in woofers, I tend to like playing 20hz loops, where the woofers go a far distance without letting out much audible sound. For mids and drivers, just play different types of brown noise at 50-60db through the night.  Then, use a full spectrum glide, like the one found on Ayre's Irrational But Efficacious burn in CD to tune everything up every 24 hours or so.