static noise while viewing

I have a access hd dta 1050 box. While viewing any channel if any kind of text scrolls across the screen or those stupid advertisements for up coming shows where they have the people in the corner of the screen come up I get nothing but an awful static sound and goes away when the commercial or text is done scrolling. Like on a news channel they might be in the middle of a news cast and put up a 1-800 number to call and the static starts and wont end till it's gone. Basically it's static noise on converter menu options, some text on news channels, some credits, some text on commercials. Is it because this model is sun standard since it was only 40 bucks and I used the coupon so it's a freebie?