I am not an audiophile. I have no ear for quality sound. But, I know bad sound and my rear speakers (the ones in the deck storage compartment) just didn't sound good. I searched this forum and found where to buy new brackets to upgrade the speakers to 3 1/2 inches. The install was plug and play. Very nice improvement for $126. And, I sold my old OEM brackets on eBay and cleared $30, so I guess it was only $96!