I have been using JL Audio for a few years and have faith in the quality of their equipment. They make high end equipment with the highest quality of components. They are not a cheap solution, but what they say they will do is what they will do. I have been able to undo the bad aspects of the installed system and make it profoundly better. The TUN software is very powerful. You have to bring all of the current signals into the FiX-86, speaker outputs from the source unit, and then bring those back to a known flat state. After you are at that state, you can now tune with the TwK-88 towards your installed equipment. You must upgrade your speakers and you must add amplification to realize the real difference in sound. Sony did a decent job of this with the equipment they installed, however this will not pass for most people who want higher fidelity sound. If this is the direction others would like to go, I would be glad to help. Just be prepared to pay handsomely for this type of system.