Maximum volume is 153% but mplayer o nly goes to 100

pavucontrol says maximum volume is 153%, lets me set it that high, but mplayer volume controls only go to 100.  If I've set the volume at 153 with pavucontrol then hit 9 in mplayer mplayer will report volumes greater than 100, but 0 won't increase them.  In fact hitting 0 sets the volume to 100 if it's at 101 or higher.