I don't know, not a whole lot is my guess.... Alpine recommends a wiring kit for their V-Drive head units, and they only make ~26 watts RMS. So my guess is they are good up to about 20-25 watts.... anything else, I would go with component wiring like Knu or Stinger.

1998 Contour GL 2.0L Zetec Stock as hell for the moment....