static / interferance

[Tam the man]

just installed some 6x9's and the sound is good to a point. if i turn up the stereo to a certain point all the speakers start getting some sort of interferance.
this nevr used to happen with the oe vauxhall speakers so i'm
someone help

[Orbital]

make sure you got the polaritys right on both speakers + on amp going to + on both speakers. if you have the speakers running out of phase it can cause problems on loud volumes.