Car audio sound quality evaluation, car speakers, car beauty recruitment, car beauty decoration, car beauty knowledge

What constitutes a good car audio system? According to the standards of IASCA, it includes good sound quality, safe circuits, complete installation, beautiful craftsmanship, unique creativity, accurate frequency response, and overwhelming sound pressure. Unfortunately, car owners in China are among the busiest people in the world. They desire a CAR AUDIO SYSTEM that reflects their personal taste both in appearance and essence, but they don't have enough time to leave for the audio modification shop to realize their requirements. On the other hand, the modification shops want to showcase their professional level. As a result, the streets are filled with modification outcomes done purely for the sake of craftsmanship. If most car owners are unfamiliar with the requirements for the appearance of the craftsmanship, then a safe and excellent-sounding audio system is your best choice.

In car audio, what constitutes good sound quality? Most audio modification professionals and audiophiles use home audio as a reference. The soundstage positioning and music reproduction of home audio systems indeed are the goals pursued by car audio, but the live sound effects produced in car audio can never be matched by ordinary home audio systems. Therefore, another reference is added to car audio - headphones. If you've ever used excellent headphones to enjoy music, you must remember that feeling of floating in space. In this narrow, enclosed, highly absorptive environment of a car, the super-wide frequency response and balance of headphones is the "Utopia" that car audio seeks.

How do we evaluate the sound quality of a car audio system? For this purpose, I will quote the evaluation rules from the International Car Audio Competition to share with everyone:

A. Linearity of the audio

B. Accuracy of pitch and balance across the entire frequency band

C. Imaging positioning

D. Soundstage and reverberation

Among these, the accuracy of pitch and balance across the entire frequency band play the main part. The accuracy of pitch is influenced by six characteristics:

A. Loudness (LOUNDESS) It refers to the intensity of auditory stimulation caused by sound, which can be affected by poor EQ or speaker sound pressure matching.

B. Pitch (PITCH) It determines the position of sound on the spectrum. It is a subjective quality, excessive distortion and non-linearity can affect pitch.

C. Timbre (TONE COLOR) It is the sound characteristic produced by the interaction of fundamental tones and overtones of a certain sound, which relates to equipment nature and cables.

D. Duration (DURATION) It is the length of time during which the sound is produced. It can be affected by the state response of the system or panel resonance.

E. Attack and decay (ATTACK AND DECAY) The time required for sound to increase from small to large (attack) and decrease from large to small (decay). Poor system response, panel resonance, and strong early reflections can adversely affect this.

F. Modulation (MODULATION) It refers to changes in sound size, phase, or frequency, which can be affected by the system's phase and frequency response.

Based on the above six points, we can divide the sound into four frequency bands for identification. Sub-bass (18-60Hz) This frequency band represents all large stringed instruments, bass drums, low-frequency synthesizers, pipe organs, etc. Under system reproduction, the sound in this frequency band should be clearly distinguishable, with real volume sense and elasticity, good extension, and no distortion. Common defects in this frequency band include muddy sub-bass due to too long decay time or unclear sound. The lowest frequency segment of the pipe organ is a good example. Mid-bass (60-200Hz) It represents medium-sized drums (Indian drums, large Latin drums), the mid-range of bass guitars and double basses, piano bass, and sound effect synthesizers. It requires smooth regeneration of elastic and detailed sounds. The difficulty lies in representing the drum and bass guitar's attack sound and staccato. This is a headache for all audio modification shops because there may be resonance or wave peaks in this frequency band within the car body, affecting the accurate regeneration of sound.

The first drumbeat of "Hotel California" is the preferred test music. A good system should show the tension, size, and impact of the hand-drummed drumhead. A common defect we often see is exaggerating the drum sound as low-frequency synthesizer sound. Midrange (200-3000Hz) This is an important frequency band, containing most musical information, and also the most sensitive frequency band for human ears. The difference between excellent speakers and ordinary ones lies in this frequency band. Basically using vocals as a reference, vocals should sound true and full without dimness or distortion and unnatural feelings. High frequency (3000-20000Hz) In the environment of strong reflection inside the car, it is conducive to the normal performance of high frequencies. However, due to the influence of installation position and improper attenuation, most car audio high frequencies are overly bright, exposing rough texture and excessive sibilance. After independent evaluations of the four frequency bands, we need to consider the balance of the entire musical frequency range. It indicates the accuracy of pitch across the entire audio bandwidth of the system. A common balance defect domestically is the excessive amplification of sub-bass, which is why many car owners don't like installing subwoofers!

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