Bluetooth ceiling speaker 6 inch powerful 20w 4 channel wall mount speaker hifi stereo home theater class d amplifier

Specifications ▪ power: 20w or 2 * 20w or 3 * 20w or 4 * 20w ▪ impedance: @8ω ▪ amplifier channels: 4 channels, rms 4x15w amp board ▪ amplifier type: class d digital ▪ frequency response: 120hz -15khz (± 3db) ▪ total harmonic distortion: less than 0.05% at 1khz, 1/3 power ▪ signal-to-noise ratio: > 70 db ▪ speaker unit: 6 inches * 1 ▪ installation: inside the ceiling ▪ material: abs housing, metal clip ▪ power supply: dc15v5a ▪ size: φ188 * 76mm ▪ cut hole: φ170mm