Comparison to a white xbox 360 with the external wifi adaptor my built in wifi on the black xbox 250gb seems to be weaker. I get excellent signal but I have lag which is quite annoying.

The xbox is in the exact same place only thing thats differnt is the equipment around it.. 32" T.V / DM800 / Onkyo AMP / Ipod Docking station and a T.V stand.

Not sure whether its the equipment causing my problem or the built in wifi ??

Whats the best way to find where my problem sits ??

thanks