With my VR5 Annies break in took about 400 hrs which seems silly but true. I burned a cd with a cut from a Jenny Clark cd "Ozone" which is ridiculous bass and per Albert's suggestion a Christian McBride cut which had a lot of slap bass...other tracks with bell sounds etc...i.e. tracks covering the entire sonic spectrum. I didn't dare play this when we were home...happy wife and all that as you know, but when we'd leave I'd put the player on repeat and the volume level fairly high...the cats must have loved it. It did speed up the break in period. Good luck...those updated Jrs should be killer!