I got myself some new speakers the other day, Behringer MS40's from a local music shop for £85 (pic below). I'm pretty happy with them tbh but I've noticed that when they're loud (not maxed out) the right hand speaker (the one with the built in amp) makes a little kind of squeeky rattle. The bass knob is only at a 1/4 and same with the treble knob. The left speaker doesn't do it it's just the right one. I was just wondering what could be causing it? Thanks everyone!