There's also a speaker break-in trick. Connect your Forests out of phase (so, reverse the leads going to ONE of the speakers), place them face-to-face right up against each other (as close as possible) and play a mono recording or throw the mono switch if there is one on your preamp. You can turn it up very loud and you'll barely hear a peep. Just be careful not to turn it up so loud you damage the speakers.
