I have used the following procedure I saw on audiogon: Place the speakers face-to-face as close as possible without the drivers touching. Coneect both speaker to either the left or right channel with one of the speakers wire out of phase (positve wire to negative terminal, negative wire to positive terminal). You can then play the tuner or a mixture of CDs on repeat at fairly high volumes on your receiver without it blaring.
the place I bought my speakers told me that I should break in my speakers by playing them at barely audible levels continuously for about 12 hours, then turn up the volume slowly for as much time as you can stand.... they told me that by the end, you should be playing them at a normal listening level with about 100-200 hours of continuous running.... granted, they told me this with JM Labs speakers which are noted for requiring extensive break-in periods
I never bought a speaker that said it needed to be broken in. A car yes, so that the pistons/valves get "seated" properly.
--- Do you make speakers or have you ever spoken with speaker makers? There are a lot of smaller high end speaker manufactures out there and all the ones I have ever spoken to have given break in times for there individual drivers. I am currently breaking in a pair that came with a very specific 120 hour breakin time.