Ok, so I tried pushing in the drivers and didn't notice nothing unusual. This weekend I will try to listen to this scene again putting my ear to each of the woofers to see if I can determine which one it comes from. Is it correct to say that if it comes from all drivers, it is my AVR that is not powerful enough, if it come from only one driver, there is a problem with one of the components? Is there something else I can try?
Dean, how did you determine it was the crossover and not the driver?

Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."