Parameter Information: Item Size: 6.5 inches Frequency Range (Hz): 30Hz-30KHz Audio Sensitivity: 91dB Speaker Types: Coaxial Speakers Voltage: 12V Car Brand: Universal Material Type: Metal andamp Magnet Output power: 400W Impedance: 4 Signal to noise ratio: 91dB Special features: None Specifications : Features: - Designed for use in any vehicle audio system. - Loud sound and clear tone quality, high sensitivity, give you a good listening pleasure. - Long service life, easy to install and maintain. - Good workmanship, light weight, portable to carry. - Strong magnet, durable, no Easy to demagnetize. - High temperature resistant, anti-aging PE rubber edge. Model name: TS-G1641R Rated power: 125W br>Installation diameter: 100mm Installation depth: 36mm Note: - The speaker will have a murmur and hum in the following situations: 1. The actual power of the speaker itself is not very large, the speaker sounds very loud. 2. The reconfiguration process is not connected correctly. 3. Without the power amplifier installed, the host sound is not good and the power is not good, the speaker sounds too loud.