Re-Foamed Monitors

I'm looking at a set of monitors but the woofers have been re-foamed - I know this may be a dumb question, but is this a common practice for older units ? And I suspect it would effect the sound  ?
 
Any input is appreciated !
 
Thanks !
 
Andy

Re-coned? Yeah, no biggie with re-coned speakers. As Mike pointed out, it does matter if the correct cones were used.

My band had a bunch of speakers and we would blow them out from time to time. We always sent them to a factory authorized repair/re-coning service center.

Assuming an off brand cone would fit ....say in a JBL or EV basket..... the cone and coil would not be the same as the factory cones and would sound different and perhaps not have the same efficiency, SPL/Watt, or tone of the original.

I have a couple of general monitor sitting on top of my luck / table. I feel very bad with the low I know the monitor and desk. There are probably several solutions, like the foam. I wish it be useful?