Volume Change: When a Stereo Sound Mixer Amplifier is connected to a speaker, the impedance of the speaker is a critical factor because it directly affects the power transfer between the amplifier and the speaker. Ideally, the amplifier's design impedance and the speaker's impedance should match for optimal power transfer and volume performance. If the impedance of the speaker is lower than the amplifier's design impedance, the current received through the speaker will increase for the same output power. This can cause the speaker to produce greater volume, since the current is the direct driving force producing the sound. Too high a current may also cause the speaker to be overloaded, as the speaker coil may not be able to handle such a high current, resulting in sound distortion or even speaker damage. If the impedance of the speaker is higher than the amplifier's design impedance, then for the same output power, the current received by the speaker will be reduced. This causes the speaker to produce less volume because the current is reduced. Although this will not directly damage the speaker, it may cause the user to feel that the volume is insufficient and require an increase in the amplifier's output power to achieve the desired volume level.
Damping coefficient change: The damping coefficient is the ratio of the speaker impedance to the amplifier output impedance, which reflects the amplifier's ability to control the movement of the speaker. The higher the damping coefficient, the more control the amplifier has over the speaker, and the less likely the speaker is to distort when playing low-frequency sounds. When using speakers with an impedance lower than the amplifier's design impedance, the damping coefficient decreases. This can lead to poorer low-frequency characteristics of the speaker because the amplifier has less control over the speaker's movement. In addition, the output sound pressure frequency characteristics may also be affected, making the sound sound less clear. Finally, higher harmonic distortion characteristics may become worse because the loudspeaker generates more harmonic distortion in the nonlinear operating region. Although a damping coefficient that is too high will not have as significant an impact on sound quality as one that is too low, it may also cause changes in sound quality. A damping coefficient that is too high may make the speaker's performance in the high frequency band too stiff and lack finesse. In addition, an excessively high damping coefficient may increase the power consumption and heat generation of the amplifier, thereby shortening the amplifier's service life.
Power matching problem: The matching relationship between the power of the Stereo Sound Mixer Amplifier and the power of the speakers is critical to the performance of the audio system. Power matching is not only related to sound quality, but also directly affects the service life and safety of the equipment. Power mismatch problems can occur when the impedance of the speaker does not match the design impedance of the amplifier. If the speaker's impedance is lower than the amplifier's design impedance, the amplifier's output power may exceed the speaker's power rating. In this case, the speaker may be overloaded, resulting in sound distortion, reduced sound quality, and possibly damage to the speaker. Overloaded speakers may burn, deform, or crack, shortening their service life. Conversely, if the speaker's impedance is higher than the amplifier's design impedance, the amplifier's output power may not be sufficient for the speaker's needs.
Increased Distortion: When the speaker impedance does not match the amplifier, it can also cause distortion of the audio signal. This is because the amplifier's circuit characteristics may change when trying to drive speakers of different impedances. Specifically, parameters such as the output impedance, gain, and frequency response of the amplifier may be affected, causing the waveform of the audio signal to be distorted. Distortion may appear as the sound becomes sharp, harsh, or muddy, seriously affecting the sound quality. Distortion problems are particularly evident at high frequencies because high-frequency signals have shorter wavelengths and are more susceptible to impedance mismatches. To reduce distortion, ensure an impedance match between the speaker and amplifier, and choose an amplifier with an appropriate damping coefficient to better control the speaker's movement.