If the songs of different styles of singers sound a little bit of nasal sound, a bit boring or hard, you can be sure that the speaker's response to the mid-range is somewhat problematic.
2 The bass should be free of distortion
The examination of the midrange is mainly vocal, and the vocal is within the frequency range of 150Hz-2500Hz, including speech and singing, mainly to distinguish the coloring phenomenon of the intermediate frequency that the speaker is most likely to have. The sound is unstable, the tone is incoherent, and the human voice has an obvious low-heavy "nose sound" phenomenon, the sound is dry, empty, and stuffy, and these can be seen as obvious defects of the speaker. Even the smallest bookshelf speaker will still have some output in the low frequency range. If you hear the bass guitar sound is not clear, some are too loud or rumble, even if a certain scale or a certain scale is too loud, it means the speaker pair The response from 60 to 150 Hz is not very good. If the thick male voice sounds a bit of "cavity" or is somewhat artificial, it also indicates poor response in this frequency band.
3 String solo and ensemble should be natural and pleasing to the ear <br> When playing string solo and accent (such as quartet or suite), it is very difficult to evaluate the speaker. Unless you have been playing some live performances, your heart is already a bit bottomless. However, speaking, even on the spot, some strings still sound harsh or screaming, so they have to try to listen to a variety of recordings, and try to hear some doorways.
4 No problem with the high pitch
Although a lot of music is not a lot of high notes (10 to 20 kHz), there are obvious highs in jazz and rock music, so you can use the jazz CDs with good recording quality for test listening. In this type of CD, there will always be some clear transient transitions that will occur again and again. When you listen, you should listen carefully to the feeling of dullness or the ambiguity that "fans" often say. In the low-pitched part, the plucked, orchestral and symphonic sound sources are mainly used for listening, and the sound is natural and soft, the rhythm is light, and the outline is clear. It is necessary to pay attention to whether the sound has a clear feeling of death and excessive viscous stagnation. This range has higher requirements for the listener and the sound source. If the speaker can meet the above requirements, we think it is better, and no more demanding requirements are made. In the super-high range, we use clear jazz and some special sound sources such as broken sound, cracking sound, and squeaking sound, mainly to investigate the transient expressive power of the speaker treble. In the repeated transient treble, see if the speaker is pronounced crisp, clean, harsh, with or without obvious distortion such as burrs, cracks, and rustling.
5 subwoofer playback sound should be good
Because the human ear has a poor sense of the bass, so the distortion can not be overestimated. We mainly look at whether the bass is thin and weak, whether it is empty or not - like a carton or a small wooden box, to calm, dignified It’s better. At this point, the woofer has good material quality, large size, box weight, thick plate, and sealed speakers.
At the same time, it should be remembered that the indoor acoustic environment has an impact on the playback of the bass, so only the speaker can be moved home to listen to the exact answer.
Industrial Main Board Cable:SCSI,D-SUB,DVI,Wire to Wire ,RJ45...
There are five types of main board power line interface, and different external devices correspond to different interfaces. Different interfaces and their connecting pins are also different. For example, the pin of the main power supply is 24 pins, and the hard disk drive is 5 pins.
1. 20pin + 4Pin interface: it is a common interface combination, in which 20pin is the main power interface and 4Pin is the auxiliary power supply interface.
2. 5pinsata interface: special interface for power supply of hard disk and optical drive.
3. 6pin? PCI? Express connector: a special interface for independent graphics power supply.
4. 4Pin connector: it is a kind of floppy disk power connector, which is used to power the floppy drive equipment.
5. 4Pin power interface: optical drive, old IDE hard disk and peripheral hardware power supply interface.
Industrial Main Board Cable
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