Tvad re the Silverlines, mine were completely functional when I first set them up, no 37 hours, or, sorry, 36 hours, needed. But one thing I noticed was that the bass sucked(!) even though one reviewer had waxed poetically about its bass. I bought a sub (took a week to get it and plug it in) and got it all set up leaving the Silverlines running full range. Then one day I forgot to turn the sub on but didn't even notice it's absence until the end of the day when I tried to turn it off. Go figure, couldn't have had anything to do with woofer break in though. I put the sub in the attic. Just any other mystery I guess. :-)