| 摘要 |
PROBLEM TO BE SOLVED: To allow the system to select either the method where characteristics of a dipole system is enhanced or the method where characteristics of a bi-pole system is enhanced, so as to avoid deficiency in low and high frequency sound components. SOLUTION: An inductor L, a capacitor C, a variable resistor VR and a positive input terminal of a 3rd loudspeaker SP3 connect with a positive input terminal 1 for a sound signal input, a negative input terminal of a 1st speaker SP1 connects with a negative input terminal for acoustic signal input, and a positive input terminal of the 1st speaker SP1 and a negative input terminal of the 3rd speaker SP3 connect with the variable resistor VR. The system is provided with a 1st selector switch SW1 that selectively connects the positive input terminal of the 1st speaker SP1 to the inductor L or the capacitor C, a 2nd selector switch SW2 that selectively connects the positive or negative input terminal of the 2nd speaker SP2 to a connecting midpoint between the 1st speaker SP1 and the 1st selector switch SW1, and a 3rd selector switch SW3 that selectively connects the positive or negative input terminal of the 2nd speaker SP2 to the acoustic signal input negative input terminal. |
