Can any fellow owners tell me whether you can use banana plugs in this amp? I have had a quick look at the back but because its so tightly packed in I can't see properly, and don't want to rip the whole lot out to find out. So far, I can see the holes are blocked and that it doesnt look like a bung at the end. Also, you cannot unscrew the screw fully so I couldnt take one off to have a look. In the review on the main site, the picture looks like there are no plugs in the holes so I'm a bit confused. Cheers for any help.