sound quality and 3 db gain. All others I have tried are muffled. Hope this helps. Although Toaster seems like he is being an @$$, he actually isnt...... at least he didnt post the toaster wiring picture, lol...... LOVE YOU TOASTER, you have always been a good help to me.
Yes an improper ground will cause everything to run awkward.... i tried to bolt my ground to the bottom of the car, my PC ran very slow and most USB devices did not work, turns out the ground cable came off and was dragging on the ground. I then took out the whole driver side interior from front to back and searched for the main ground point that Dodge created for my SUV, bolted on and have had no issues since.