Vacuuming is best. If you are a little brave, putting the panels under the shower may just work. A lot of the time, dust and debris can affect the sound and will cause some hissing and cracking sounds. Just make sure to unplug your speakers for at least 10 hours (so that the electrical charge will dissipate) and then vacuum the panels (front and back). You will notice an immediate improvement once they are plugged in again.
For more info, you can check out the Martin Logan Club at http://www.martinloganowners.com
Jason Liu
President
Martin Logan Club
For more info, you can check out the Martin Logan Club at http://www.martinloganowners.com
Jason Liu
President
Martin Logan Club