OP have a hidden agenda???
My experience: burps are louder with a fresh recone, lows become more prominent after a decent amount of playing time. Same as what others have said.
I run HDC's which have a pretty stiff suspension, so it makes sense that as they loosen up you gain excursion which makes the lows more prominent. Louder to the ear, but not on the meter.
The copper HDC's I've installed for people require a "break in" period for the spider pack to take a proper set. If not the sub can make noise for a while until they do take a set. I've seen guys beat on them right away with no issues and I've seen 1 or 2 have noise for a while. I always break mine in overnight on low volume and then beat on them the next day and have never had an issue.
My experience: burps are louder with a fresh recone, lows become more prominent after a decent amount of playing time. Same as what others have said.
I run HDC's which have a pretty stiff suspension, so it makes sense that as they loosen up you gain excursion which makes the lows more prominent. Louder to the ear, but not on the meter.
The copper HDC's I've installed for people require a "break in" period for the spider pack to take a proper set. If not the sub can make noise for a while until they do take a set. I've seen guys beat on them right away with no issues and I've seen 1 or 2 have noise for a while. I always break mine in overnight on low volume and then beat on them the next day and have never had an issue.