单选题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
题目
单选题
Which of the following is the primary purpose of impedance matched volume control？（）
A
Maintains proper speaker phase
B
Protects the amplifier from damage
C
Protects the digital systems from damage
D
Amplifies the speaker signal