Features:The passive speaker is made of MDF material, with glossy paint, smooth, moisture-proof and anti-oxidation, strong and durable.Adopts cast aluminum bracket wool paper basin, 69mm effective vibration basin area, high sound quality clarity, low distortion.The speaker uses anti-skid pads on the bottom, can better stabilize the speaker, while preventing the speaker from being scratched and damaged.Gold plated copper terminal, high conductivity, practical and beautiful.Phase-inverted design, built-in acoustically measured-inverted tube, effectively improve the performance of low and medium frequency.Specifications:Brand Name: Summer Audio S3Type: SpeakerColor: White/Black(Optional)Material: MDFFrequency Response Range: 118Hz-18KHzPower: 5-30WSensitivity: 88dBImpedance: 4 ohmPackage Size: 30*23*19.5cm / 11.8*9.1*7.7inPackage Weight: 3725g / 131.4ozPackage List:2 * Speaker