You probably have the same problem as me, realtek HD already have it

you need to turn on the boost by the microphone but of course you can't find it? He's there, just in a very strange place, don't look for him in recording, only in playback. Run realtek HD manager->mixer tab->wrench icon->press and select advanced controls->scroll with the small arrows located on the right until you find FRONT PINK IN and REAR PINK IN->there are these tiny icons with 2 dots of Advanced -> check the option : increase microphone performance. And that's probably all, just go to the windows control panel and set the appropriate volume or do the same using the realtek application in Program files\realtek\Audio\Drivers\WDM\MicCal.exe