The JBL GTO627 speaker is made of a poly plastic material and features a dome tweeter design. The tweeter is 0.75 inches in diameter and constructed of a Mylar and titanium composite material. This 6.5-inch car speaker is powerful, with a maximum peak power-handling capability of 180 watts. This JBL Grand Touring car speaker, in comparison to others of the same size, offers more surface area, allowing more power to flow through. A coaxial wiring system protects the terminals, along with the wires themselves, as they are protected by copper under a plastic coating. In addition, the JBL GTO627 speaker includes an impedance of 2 ohms. This 6.5-inch car speaker is a two-way non-powered component, and the sensitivity on this JBL Grand Touring car speaker is 92 dB. Technical features include a computer-optimized voice-matched passive crossover, UniPoint tweeter points, and RMS power of 60 watts. Functionality aspects of this JBL Grand Touring car speaker include level control, easy access to wire terminals, and a frequency response range between 55 Hz and 21 kHz.