converter to connect to tv as a larger monitor. issue is that the audio at the converter is a pass through. that means I need to increase the volume on the tv to compensate then lower it again for tv viewing. what I need is an in line rca jacked bosster powered or not that will raise the gain high enough so the tv volume is the same for both devices. I have a small amp I can use but the line level in does not match the desktops line out(low level?). an attenuator might work ether as designed or in reverse or a booster is probably what I need. I used a gain booster from MCM, marked as a line preamp until one channel died. The current prices or too expensive. model names, part numbers, websites please.