Some mobile phones, tablet computers or laptop computers will react to the powerful magnetic field from the loudspeaker drive units that are right beneath the top panel. Some have magnetic sensors built in, which means that covers with magnets in the lid can turn the phone ON when the cover lid is opened, and turn it OFF again when the lid is closed. Such phones may turn off if placed on certain portions of the top panel. Other devices are simply sensitive to magnetic fields. You can move the device around on the top of your L8 or L16 speaker, to check if some locations are better than others. The magnetic fields are most powerful near the front panel, where the speaker units are mounted. If you cannot find a location which works, your particular phone, tablet or laptop cannot be used while resting on the top panel of your speaker. There are no reports of damage to any devices because of this phenomenon.