Improve the car audio sound elm327 quality

Establish a sound system, the mix of various elm327 equipment should keep the style consistent, otherwise it may result in the appearance, function, use, indicators uncoordinated.
, CD, MD Do VCD, MP3: If you only used to play a sound, the host or select CD, MD or DVD. VCD sound quality is poor, not the best; MP3 is a compression format, despite an increase in sound quality processing circuit, but the sound quality is still not as CD; DVD sound quality close to CD, but the overall comparison, still not as CD; little difference the MD and CD sound quality , but the sound is a little hard. CD, use genuine, with "DDD" is printed on the disk the best sound quality of this CD, produced;
2, to be "genuine," Do equalizer: The host should be used without any modification of the model of the signal. The signal is modified, its waveform distortion, so the music does not play out the ideal. The host of the "authentic" is not the best graphic equalizer, field effect (such as: theater, square, studio, etc.). Modified field effect, the original signal changes, the loss of the original sound.
3 24bit Do 1bit: select the model depends on the frequency response indicators, without any additional modification of the sound quality features. The audio shop sales of CD albums on the label indicate 20bit and 24bit. 20bit and 24bit high resolution to make music to be fully demonstrated. Ordinary   vas 5054a  audio 1bit, audiophile-grade sound use of high bit. Only in this machine player, will exhibit its delicate.
4, high-power not distortion: the host directly promote the speaker to select high output power. Host output power generally in 4 × 50W, mainly to reduce distortion. With a host of pre-output, high output level, in order to improve the signal-to-noise ratio, the output level is generally best choice 2V, 4V output. In an audio system, the greater the host or the output power amplifier, showed that they are able to control the audio greater linear range, the stronger the ability to drive a speaker. Small power amplifier is not only likely to cause distortion in the sound, cause burning power amplifier or speaker coil, the end of the day spent a lot of effort and not ideal music.
5, natural sound reproduction principle: the so-called replay not play music with original music changes. Quality evaluation, an important indicator is the frequency response curve smoothness. Smoothness of the curve is the loud sound of each range size, each range of sound the same, the smoothness   Volvo VIDA DiCE of the curve like smoothness better, better audio and visual effects.