This isn't a help thread it's more or less a recommendation. I recently had a line output converter installed professionally in my car by a semi-local business, and I installed a system in it myself. I can't say how much I love having a little extra thump to add to the Soul's already (surprisingly) boomy stock setup. I have the base 6 speaker audio system with the small touch screen radio, and don't get me wrong it sounded good I just wanted (a lot) more bass. If anyone wants to see pictures or even the name and location of the business that did my install I'd be more than happy to oblige. I even still have my receipt so I could show you the cost of the install, which honestly wasn't too terribly bad for what it was. Thanks for reading!