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具体参数：
MODEL:IA-78.4 4Channel Amplifier
额定功率 RMS(4Ω) 60W×4
额定功率 RMS(2Ω) 120W×2
额定功率 RMS(1Ω) ≈
桥接 BTL POWER 250W×1
低音提升 BASS BOOST 0-12dB
信噪比 S/NRTIO 92dB
低通