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Detailed Product Description Outdoor column speakers features: 1) Cost effective column speaker, ideal for background music, and paging applications, such as schools, hotels, auditoriums, hospital, museums, patios, residential spaces, restaurants, theaters, and parks 2) Superior sound quality and stable excellent performance 3) Wider dispersion and smooth off-axis coverage 4) Easy, convenient, safe and fast installation 5) Excellent designs and finish make top grade attractive appearance Indoor wooden column speaker T-301A: 1) Rated power: 20W 2) Line voltage: 100V 3) Sensitivity: 90dB +/-3dB 4) Impedance: 510 / 420Ω 5) Frequency response: 130 - 15kHz 6) Dimensions: 115 x 160 x 360mm Indoor wooden column speaker T-302A: 1) Rated power: 30W 2) Line voltage: 100V 3) Sensitivity: 91dB +/-3dB 4) Impedance: 350 / 300Ω 5) Frequency response: 130 - 15kHz 6) Dimensions: 115 x 160 x 460mm Indoor wooden column speaker T-303A: 1) Rated power: 40W 2) Line voltage: 100V 3) Sensitivity: 91dB +/-3dB 4) Impedance: 280 / 250Ω 5) Frequency response: 130 - 15kHz 6) Dimensions: 115 x 160 x 610mm Outdoor aluminum column speaker T-901A: 1) Rated power: 6W 2) Line voltage: 100V 3) Sensitivity: 92dB +/-3dB 4) Impedance: 1k / 1.7kΩ 5) Frequency response: 130 - 16kHz 6) Dimensions: 380 x 227 x 125mm 7) Net weight: 2.0kg Outdoor aluminum column speaker T-902A: 1) Rated power: 15W 2) Line voltage: 100V 3) Sensitivity: 93dB +/-3dB 4) Impedance: 450 / 670Ω 5) Frequency response: 130 - 16kHz 6) Dimensions: 520 x 227 x 125mm 7) Net weight: 2.3kg Outdoor aluminum column speaker T-903A: 1) Rated power: 25W 2) Line voltage: 100V 3) Sensitivity: 94dB +/-3dB 4) Impedance: 360 / 420Ω 5) Frequency response: 130 - 16kHz 6) Dimensions: 720 x 227 x 125mm 7) Net weight: 2.5kg Outdoor aluminum column speaker T-904A: 1) Rated power: 50W 2) Line voltage: 100V 3) Sensitivity: 95dB +/-3dB 4) Impedance: 180 / 250Ω 5) Frequency response: 130 - 16kHz 6) Dimensions: 920 x 227 x 125mm 7) Net weight: 2.8kg Outdoor aluminum column speaker T-905A: 1) Rated power: 70W 2) Line voltage: 100V 3) Sensitivity: 96dB +/-3dB 4) Impedance: 130 / 150Ω 5) Frequency response: 130