No man, what the 4V means is that the head unit puts out and its only helps if ya have an amplifer hooked up to it.
Ya see the amplifer whole job is to amplife the siginal from the head unit, more power from the head unit, less work the amp does meaning less heat whiches causes over heating.
I hope thta helps ya out if not u can e-mail me
chowsvt@msn.com
Ps.by the way I got 8V pre amp out puts
Chow
98 SVY #2263
