I have bb 100 meg and 2 subscribed boxes the modem shows snr of 39dB and the box shows 35dB on the tech screen these have worked flawlessly for many years, I have disconnected all equipment from the cable and connected direct to the input, I have various attenuators up to a total of 24 db, I have tried all combinations of these to no avail, I have taken the box to my son's house to try it on his cable with the same results, I have tried open vix and open atv all with the same results, the cable is scanned resulting in 603 channels found, these channels all are breaking up both sound and vision aid are unwatchable, I have only tried the fta as I have no line as yet.I am not a novice but I maybe doing something wrong but I don't think so.