I use CSBs and my Sharp MD only has a line-in, no mic-in, but I've never had a problem. I usually set the line-in volume to 26, get in front of the stacks, and the levels only go about half way up. I could probably turn up the volume some, but don't want to risk any overloading. I always have to crank the volume when I master it to CD, but it turns out nice.