The Edifier R990BT bookshelf speakers deliver high-quality audio performance with advanced features. Each speaker cabinet houses a 1" silk dome tweeter and a 4" long-throw mid-low driver for clear sound reproduction. The MDF cabinet construction minimizes resonance and distortion. Equipped with a digital amplifier, these speakers offer a total output power of 24W (RMS), suitable for medium-sized rooms. Dynamic Range Control (DRC) optimizes sound output. Bluetooth V5.4 ensures seamless wireless streaming. Dual RCA input ports allow for simultaneous connection of two devices via audio cables. The Edifier ConneX App provides three preset sound effects (music, movies, gaming) and allows for custom sound effect creation, enabling a personalized audio experience. Key Features: - 24W total output power - 4" long-throw mid-low drivers - 1" silk dome tweeters - MDF enclosure - Bluetooth V5.4 - Dual RCA inputs - Preset sound effects for music, movie, and gaming Specifications: - Total Output Power (RMS): 12W +12W - Driver Units: Treble: 1-inch, Mid-low: 4-inch - Frequency Response: 60Hz - 18kHz - Signal-to-Noise Ratio: = 85dB(A) - Audio Inputs: Bluetooth, Line In 1, Line In 2 - Input Sensitivity: Bluetooth: 450±50mFFS, Line In 1: 500±50mV, Line In 2: 700±50mV - Bluetooth Version: V5.4 - Codecs: SBC - Dimensions (W x H x D): 226mm x 140mm x197mm (Per speaker) - Net Weight: 3.44kg