The main criteria for judging speaker quality include the following aspects:
Appearance design: Good speakers usually have exquisite appearance design and fine manufacturing technology. The shell material is mostly metal and has no obvious defects.
Sound Effect: The ultimate goal of a speaker is to present clear and realistic sound effects. When playing music, high-quality speakers can ensure the balance of treble, mid-range and bass, with clear sound quality and no hoarseness or interruptions.
Response frequency: Frequency response is an important indicator to determine whether the speaker sound effect is consistent with the original sound. A high-quality speaker has a smooth frequency response curve without significant fluctuations.
Signal-to-noise ratio: The signal-to-noise ratio refers to the ratio of the output signal to the noise when the speaker outputs sound, usually expressed in decibels. The higher the signal-to-noise ratio, the less noise there is when the speaker outputs sound, and the better the sound quality. Generally speaking, a good speaker has a signal-to-noise ratio of over 80 decibels.
Low-frequency quality: High-quality low-frequency should be clean, bright, and well-defined, rather than bloated and thick. Good low-frequency instruments such as drums, bass guitar, etc. can be easily distinguished.
Mid-range vocals: High-quality mid-range vocals should have no unusual nasal or unclear sounds, and maintain clarity of the sound.
High-frequency flexibility: Good high frequencies should be soft and flexible, not intimidating to listen to, nor tiring to listen to.
High volume and sound field imaging: When the volume is increased, high-quality speakers can maintain stable sound quality without distortion or deformation, creating a clear sound field and imaging.
Test method: You can use a pointer multimeter or a 5V battery to test the quality of the speaker. Set the multimeter to the R*1 position and measure the speaker's lead-out terminal. Under normal circumstances, a crisp "click" sound should be heard. If you don't have a multimeter, you can use a 5V battery to perform similar tests. In addition, impedance detection and polarity judgment can ensure the phase consistency of the speakers to avoid distortion.