New Fosgate speaker problem

[Joshman]

I have a 2000 watt Powerbass amp hooked to 2 rocksford fosgate 15" p1 speakers. I have the amp turned down a bit right now. But for some reason one of my speakers has a rattling sound in it when I turn the amp up some or if I have it low and turn the volume up. It's not constant, it's like it has to "heat up" maybe before it makes the sound. It wasn't making it earlier. Do I have too much power going to it? It's a brand new speaker. I'm pretty new to this so be easy and try and help.

Also I traded my 4 audio planet 10" 300W speakers for these from a friend just to see if I can sell
Them and I wanted to hear 15s in my Chevy. This box is ported and my 10s were all sealed separately. The sound is not the same and I'm thinking "with 2 15s I should beat my brakes off my truck" well I'm dissapointed in the sound and everything. It's not hitting hard and not shaking my truck like the 10s did. Any ideas?

[heebs 09gts]

For the rattle in the speaker, is it coming from the speaker, or could it possibly be the sub box has a loose piece?

[Joshman]

Sounds like the speaker but I'm going to open the box up in a few minutes and check.