i have 1 set of speakers in my room on wall brackets. to these speakers i would like to run my amp to them but also the output from my panasonic plasma speaker terminals. i have fitted a speaker switch but when i put on the plasma the sound comes through them for about 5 seconds and then clicks off. it is all wired correct, do you think i need a quality speaker switch as it seams this one even though put to plasma input is causing some kind of overload or short. what is a good quality speaker switch?