The center speaker can be put to use in a variety of ways. If you were to install an aftermarket processor such as the JBL MS-8, to get optimal performance from the processor, you'd need a center speaker. You could also make use of it with, for example, an AudioControl ESP-3 or the amplified version, the Model 11. These processors were made in the 90s, but can be found on eBay. While the installation and wiring isn't for everyone, installed, they make a huge difference in the car's sound (for the better). I just replaced a 2008 Mazda3 GT with a CX-5 GT and plan to use the MS-8, replacing the BOSE Centerpoint system. This is my first car with a center channel. I've had the opportunity to hear a number of cars with well-designed sound systems that make use of a center speaker and have been very impressed with the improvement it offers.