Weak current College】 【subwoofer, car audio quality evaluation criteria.

<br> <br> Car audio sound quality evaluation criteria and there are two, the first is an objective standard, ie equipment testing standards; the second is a subjective evaluation criteria. These instruments detect standard (that is, the objective criteria) are .clear, the subjective standard is varies from person to person, so the first objective to detect performance, is a good speaker and basis of course subjective evaluation should take the "analytic power good (music clearance on high)," "vivid sense (speaker .performance music more lively), "and" knot like a force of good (sound cohesion, location good) "and" air feeling (elastic) "and" transparency (treble penetrating well), "and" energy density "and" dive deep .(bass rich) "and" resonance "and" self-excited "" harmonic "and" harsh "and" upset "and" fog "and" fuzzy "and" waving "and" narrow "and" unable "and" tail " ., and so on are described as speaker of subjective evaluation terms. <br> <br> Secondly, in order to demonstrate our persuasive, and the closeness that we can use United States sound evaluation expert DanielKymin (Daniel · library), recently put forward .five evaluation speakers standards. <br> <br> (1) the baritone voice, the song should open <br> <br> If the different styles of singer singing sound number have dotted the nasal, a little hair dull or dry hard, .just to be sure the speakers on the band's response to some questions. <br> <br> (2) bass should no distortion <br> <br> Car audio in on the baritone voice of visits to the human voice is mainly about 150Hz .-2500Hz frequency range, including speech sound and the sound of singing, mainly on the speakers are most vulnerable to the dyeing with MF to distinguish the phenomena, such as the human voice, tone choppy, the human voice with obvious low weight "nasal" .phenomenon, the sound was dry, hollow, dull, - these can be regarded as sound obvious defects. Even the smallest bookcase-speakers are still in the low frequency band some output, if you hear the sound of the bass guitar is not clear, .some too loud or whistles or even a scale or a set of scales, too loud speaker on 60 to describe 150Hz this frequency response is not good, if the manly male voice sounds a little "cavity tone" or some contrived, as described in this .band's response unsatisfactory <br> <br> (3) treble section don't go wrong <br> <br> Although several music pieces and will not appear much treble (10 ~ 20kHz this paragraph), but the jazz and rock music have .clear treble, because of the available audio quality good Jazz CD album for testing. In this type of CD recordings, most of them will always be some repeatedly occur in clear moment of transition. Listen, you should listen to what has no chenmengan or " .enthusiasts "often say that kind of vague. <br> <br> In the lower part of the main use of the treble stringed music, orchestral and symphonic music to listen to the sound source, requires sound of gentle nature, relativamente, sharp, .it should be noted that there is no clear tone sounds dry dead feeling and excessively thick stood still, all in all this a range on the listener and source of requirements is higher, the speaker can achieve the above requirements we think better, no longer demanding .requirements. In ultra high range we adopt clear jazz and some such as crushing sound, splitting sound, chirping, and other characteristics of the sound source, the main investigation of transient sound treble. In repeated viewing of transient treble sounds in the sound is crisp ., clean, there is harsh, Burr, splitting sound, rustle, obvious distortion. <br> <br> (4) bass <br> <br> Since the human ear on the bass that sensitivity comparison, so one can however distortion of .care, we mostly see the subwoofer to the subwoofer is thin, whether empty dry - like from the tray or small wooden box, with calm, dignified and powerful. At this point, the bass unit material, bulky, heavy weight, sheet metal boxes ., seals of good speakers will have better performance. <br> <br>.