Does anyone know what a good, normal level, cable signal is (I assume in dB's). Source level that is, before any kind of splitters, etc. Got a new 60" Sony LCD and want to get everything hooked up and set-up right. Trying to figure out if we have a weak signal and need an amplifier or if the signal is too strong - which is kinda what the cable company has hinted at.

Thanks,
-E