a, the card is not correct, the sound card is not closely combined with the motherboard expansion slot, and the \"gold finger\" on the sound card is misaligned with the reed of the expansion slot through visual inspection. This phenomenon in the ISA card or PCI card have, is a common fault, find a way to let the sound card inserted right can solve the problem.
b, the active Speaker input end is connected to the speaker output end of the sound card, the active speaker should be connected to the Line-Out end of the sound card, its output signal is not amplified on the sound card, and the noise is much smaller. Some sound cards have only one output, is Line-Out or Speaker depends on the jumper on the card to decide, the default way is often Speaker, so if necessary, you have to unplug the sound card to adjust the jumper.
c, the version of the installed sound card driver is not good, you may use the system's own driver, if so, it is best to install a special sound card driver. If the Windows driver has been installed, select Control Panel → System → Device Manager → Sound, Video, and Game controllers, select each device, and select Properties → Drivers → Change Drivers → Install from Disk. Insert the disk or CD that came with the sound card and install the driver provided by the manufacturer. If it can not be solved, it is best to find a buyer to help repair it.
There may be a problem with the microphone. You need to set the microphone. Right-click the small speaker icon in the lower right corner of the taskbar, select \"Recording Device\" from the pop-up shortcut menu, then enter the \"Sound\" dialog box, switch to the \"Recording\" TAB, double-click the \"microphone\" option directly or right-click the \"Properties\" command.
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Switch to the \"Levels\" TAB, turn up the volume for \"Microphone\" and \"Microphone Enhancement\
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It's probably because you were recording in an empty space.
(1) The sound card itself has poor anti-interference ability. Some miscellaneous sound card due to poor workmanship and materials, so susceptible to other equipment electromagnetic interference, which belongs to the quality of the sound card, ordinary users can do is to make the sound card as far as possible away from other devices that will emit electromagnetic waves.
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(2) The sound card is not installed properly. Due to the lack of high manufacturing accuracy of some chassis manufacturers, the sound card cannot be tightly integrated with the motherboard expansion slot. Through observation, it can be seen that the \"golden finger\" on the sound card cannot fully contact the reed of the expansion slot. This phenomenon in ISA or PCI sound card, is a common fault, generally by adjusting the position of the sound card baffle can be solved.
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(3) Driver problems. You should try to use the special drivers issued by the sound card manufacturer according to the different operating systems. Third-party drivers and Windows default drivers often have some problems in some aspects.