right any flickering problem due to mobile singlans and all is only in CRTs. And generally you can solve this problem by correct power supply and degaussing the CRT, if it flickers.
For LCDs cannot flicker they can just shutdown or give distorted and bad display and in short can be called fuzziness. are you using separte power source for both or same(I mean UPS). because certainly going on high volume sound and bass means your are asking more power input. Is that affecting your LCD. and does high sound from the woofer really affects the LCD Display like that.