Extra backplate for MC's?
Sorry if this is a really newbie question but I was just puzzled by a few things. I was looking at Universes because i'm thinking about getting a 7 string, and I noticed on the Universe Multicolour, there is an extra backplate. What is this for? Obviously theres one for the trem, one for the input jack but a third one? Here's a really clear pic of one: http://jemsite.com/axes/jem77/77pmc05b.jpg
I only noticed because there wasn't one on my Jem7VWH (Best guitar ever
Edit - I've just noticed it on the DNA model too.