3dB
6dB
12dB
24dB
Each time the distance from the speaker is doubled, volume decreases by().A、3dBB、6dBC、12dBD、24dB
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在远场区,同声程横孔,直径增大1倍,则声压增大()。A、3dBB、6dBC、9dBD、12dB
8阵元智能天线的理论赋形增益为()A、3dBB、6dBC、8dBD、9dB
目前标准POI插损在()左右。A、3dBB、6dBC、7dBD、10dB
Which of the following is the correct signal flow for an analog multi-room audio system?()A、Source,Volume Control,Speaker,AmpB、Source,Amp,Volume Control,SpeakerC、Amp,Source,Volume Control,SpeakerD、Speaker,Amp,Volume Control,Source
Which of the following is the primary purpose of impedance matched volume control?()A、Maintains proper speaker phaseB、Protects the amplifier from damageC、Protects the digital systems from damageD、Amplifies the speaker signal
航向设备对工业、科学和医疗设备干扰的防护率是()。A、3dbB、6dbC、14dbD、17db