hello. I have just purchased a Magnat Alpha 30A sub this week. I have set the volume level and crossover freq, everything ok. I like the sound, and it adds a lot to the movie experience. But when I turn on (or off, I don't remember... Maybe both?) the light in the room, it affects to the sub, and it produces one disagreeable sound. Is it normal? Should I worry about it? I know the technical reasons why it occurs (I am physicist, after all), but I don't know if it is a problem or not. I also know that there are some electronic devices to protect your amps, to avoid current peaks like the ones created by the switching of the lights, and any fluctuations of the voltage, etc. My question is, should I worry about it, and look for such a protecting device, or I can forget about it, and avoid touching the light switch while playing music or watching movies? Thanks.