breaking in new subs

aight thnx, 2wks is gunna seem so long tho i already kno

Why do people keep thinking too little power will damage a sub?  That is nonsense.  Where did this myth get started, at The Good Guys car stereo sales department?  Running too small an amp and pushing it into clipping, now that will damage any speaker system.  But running a 500 watt RMS sub on 50 watts will damage nothing as long as the amp is set up properly.  It would be a waste of money on the sub, yes, but damaging, no  If your car can go 120 mph, does that mean you will damage it if you drive no faster than 60?  No.  Not as much fun, granted, but the motor will be just fine.

Now, as far as breaking in a driver is concerned, there are many approaches to this and most of them work. Some manufacturers publish specific guidelines and you should check what your driver manufacturer recomends.  A good rule of thumb is 20 hours for woofers using a 50 hz test tone or 40 hours using a  music program, at 50% power.

thanks for all the advise, does anybody know the infinity reccomendations?

Look, this is not worth a flame war... but it is absolutely ridiculous to think that too little power will ever harm a sub or any other loudspeaker.  The "10 to 150 wrms" rating you mention actually means that the manufacturer recomends at least a 10 watt amplifier to attain the stated frequency response, and the voice coil can handle the heat of a maximum 150 wrms input.  It has nothing to do with "extended listening at low volumes can damage a sub."  This is complete BS and mis-information from people who are generally interested in selling amps who know nothing about electrical or loudspeaker theory.

Don't take my word for it.  Do some research.  Start here: http://totoro.efiregate.net/HTMLPages/Tuning/GainSetting/GainSetting2.htm

You mention sensitivity.  Loudspeaker sensitivity ratings are given in db per watt-meter (or an equivalent value like db per volt-meter.)  This means if your loudspeaker is rated at, say, 90db, that it produces 90 db with a 1 watt input measured 1 meter away from the driver.  So does this mean the loudspeaker is now damaged since it was operated at only 1 watt?  According to you, yes it does.  This is silly.

And by the way, if you really think that driving a car at 60 will prevent you from attaining maximum speed (or that listening at low volumes/power input will prevent a speaker from attaining max output) then I have a bridge for sale you may be interested in...