"We believe that the decision to invite the band fit our rubric of engaging culture through a Christian lens. The band makes good, thoughtful music, and we invited them here based on their artistic merit. However, after weeks of discussion and consideration, the irony of the band's name was impossible to explain to many. The band's name, to some, is mistakenly associated with pornography. Consequently, Calvin, to some, was mistakenly associated with pornography. Neither the college nor the band endorses pornography."
The Grand Rapids Press has more information here.