Rattling from speakers

Hi, I have two 4 inch diamond audio components that are being ran by a mrv-340 with about 55 watts to each of them.  I have the gain set at 1/4 of the way up and they sound good, but i hear rattling from them when certain frequencies are played, but others dont make them rattle.  it seems to be the higher bass frequencies that causes them to do so.  If i turn the gain down farther you can barely hear the speakers at all, whats wrong? 

Sounds like the speakers are trying to reproduce frequencies they cannot handle very well.  Do yu have a high-pass crossover on them?  If so, where is it set?Support the12volt.com

well you say that the higher bass frequencies are ratteling,   this might be as simpole as your wires behind the speakers are hitting it or maybe some other things inside your door are ratteling....do your speakers hit decent lower mid bass? around 100-160 hz?2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR

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I have the crossover that came with them wired to them and the gain is way down, so it may be the wires hitting them but the rattle kinda has like a highpitched squeek to it, and it only happens when its higher base frequencies the low bas is perfectly clear.