best way to break in Sound Labs U1?

I mostly agree with Duke, except about break in.

Having owned multiple pairs of Sound-Lab over a 15 year period, optimum break in does not occur until after 800 hours (or about 7 months use).

I'm not saying you won't enjoy them until then, but U-1's don't max out their performance until fully broken in.

Oh, I should have added:

Music with big dynamics and heavy bass after the first month of break in will speed up the time before they sound best, each time you start from cold (system off for several days).

Lots of parts in the crossover and for some reason big dynamics and powerful bass quickly overcomes the "cold compression sound" of first starting them up.