What is the diameter of a 6.5-inch speaker in centimeters?
3 Answers
6.5-inch speakers generally have a diameter of approximately 16.5 centimeters. Working principle of speakers: The working principle of an air horn is to use the airflow of compressed air to vibrate a metal diaphragm and produce sound. Therefore, it can only be used on vehicles equipped with an air compressor. Air horns are generally installed on large buses and heavy-duty trucks, especially for long-distance transport vehicles driving in mountainous areas or curves. Using an air horn can effectively alert pedestrians and oncoming drivers. This is because air horns have high volume, good sustain, pleasant sound, and can be heard over long distances. Air horns are typically cylindrical and use a combination of high-pitch and low-pitch horns. The working principle of an electric horn is to use electromagnetic force to vibrate a metal diaphragm and produce sound. It is a widely used type of horn in automobiles, classified into three structural forms: cylindrical, spiral, and cone-shaped, with spiral and cone-shaped being the most common. Classification of horns: Automobile horns are divided into air horns and electric horns based on their sound power; into cylindrical, spiral, and cone-shaped based on their appearance; and into high-pitch and low-pitch horns based on their frequency.
I often help friends upgrade their car audio systems. A 6.5-inch speaker has a diameter of approximately 16.5 cm, since 1 inch equals 2.54 cm. Calculating it, 6.5 multiplied by 2.54 gives 16.51 cm, but we usually just say around 16.5 cm. This size is very common when installing speakers on car door panels and fits most vehicle door panel openings. If you're upgrading your speakers, remember to check the existing hole size, as some speaker frames might be slightly larger, but the core diameter is this measurement. Also, pay attention to power matching when choosing speakers. For example, if the original car's power output is too low, the new speakers might not perform well. During installation, using a tape measure for verification is safer to avoid fitment issues or sound distortion. Safety first—always disconnect the power before making any modifications.
I enjoy DIY car audio systems, and the diameter of a 6.5-inch speaker calculates to 16.5 cm based on the conversion formula 1 inch = 2.54 cm—just a simple multiplication. In actual installation, I found this size fits perfectly in the door panel, saving space while ensuring sound quality. Last time I replaced the speakers, the precise size made the installation smooth. I recommend measuring the door opening first to ensure the new speaker fits. Additionally, speaker size affects sound performance; 6.5-inch speakers are great for mid-low frequencies, but if you want deep bass, adding a subwoofer is ideal. DIY is fun, but make sure you have the right tools, like screwdrivers and insulating tape.
