Jag mailade Logitech och fick detta svar, klart som korvspad! jag har nu flyttat på högtalaren.
"Please note that the subwoofer of the Logitech Z-4i Speaker system is not magnetically shielded and therefore we do not recommend placing any of the electrical devices next to the subwoofer. It is always recommend to a minimum distance of 2 feet between the subwoofer and the electrical devices."