If you are on the PB, you are a High Calvinist as a general rule.
A low Calvinist, I think, is one who affirms doctrines such as the 'two wills of God', God's universal love for all creation, God's desire for all to be saved, duty faith, the well meant offer, unlimited & limited aspects of the atonement, and sometimes they also redefine the T by distinguishing between moral/natural ability.
I can't think of a popular teacher who would be considered to be a Low Calvinist, except maybe John Piper.