I'm looking at upgrading the system in my G35...I've gotten almost everything figured out except the LOC. The stock HU puts out differential balanced signals and I need to convert them for my amp (planning on buying the Boss REV-665). I'm on a budget so I can't replace my HU (plus, the trim conversion kit costs over $300). I need it for 3 channels (fronts and a sub).. so a 4 channel one would work. I've heard the David Navone ones are good (NE-774V) but am concerned with things like this. Are they the best ones compared to just any LOC or should I look at something else? Ideally, I'd like to get the Audiocontrol LC6i/7 but that's out of my budget. Thanks.