pioneer headunits

My Pioneers have treated my good.  As long as you don't hot swap or hot install the RCAs you won't blow the Pico Fuse.  Following proper install proceedures is always a good thing.

Nevertheless, I agree that 4v signal isn't going to improve SQ.  It'll raise the noise floor a few DB, but that's of little use unless you're competiting.  An EQ on the other hand can be a huge help.  Of course then you have to get the test tracks and/or equipment to get the EQ dialed in.