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Parameters Brand: Nobsound Model: NS-14G PRO Audio input: Bluetooth 5.0 / stereo L/R RCA Audio ouput: banana speaker jacks Number of channel: 2.1 Bluetooth chip: QCC3034 (support APTX / APTX-HD) Amp IC Chip: TPA3116D2 ×2 Matched speaker impedance: 4Ω-8Ω Op amp: TL072×4 Max. output power: 50W×2+100W(4Ω, 24V) Frequency Range: 20Hz-20kHz (±1dB) Subwoofer frequency range: 20Hz-200Hz THD: ≤ 0.01% SNR: ≥ 118dB Treble & bass range: ±10dB Input sensitivity: ≤ 280mV Working voltage: DC 12V-24V (don't exceed 25V) Dimensions(W*D*H): 100*157*35mm / 3.94*6.18*1.38in Net weight: 490g / 1.08lb Package weight: 1000g / 2.20lb Packing List 1× NS-14G PRO Amplifier 1× 19V Power Adapter 1× User Manual