Precision Power 355cs - Manual (Page 7)

ear level . Place the tweeters in similar locations on both sides of the vehicle . Try
a few locations by just placing the tweeter or taping it in a location and listening
to ensure the desired stereo image and high frequency dispersion are achieved
before committing to a location by drilling holes in the vehicle . You should also
experiment with the tweeter phase switch settings to find the most effective
combination of location and phase .