Enable the audio output/playback to 32bit or 24bit instead of 16bit, as this will slightly improve audio quality. Issue regarding setting volume to 100% is detailed here. Windows XP: Don’t increase the Windows Audio Volume to 100%, instead set it to 80-90% max in order to decrease the effects of dynamic volume issue. Warning: Enabling this setting will change playback audio bit depth to 16bit and sample rate to 44100 Hz, and when disabling it windows will set will change playback audio bit depth to 24bit and sample rate to 48000 Hz. Optionally, you can also try "Dolby Access", "DTS Sound Unbound" or "Dolby Atmos for Headphones" options. Windows 10: If you wish to emulate 8 channels surround on a 2 channel headphones/speakers you need to right-click on Windows Volume tray icon-> Spatial Sounds-> select “Windows Sonic for Headphones”. The sound effects also change the sound not always in a good way, you might like it for your music but it might harm the audio positioning in games. The sound effects will slightly increase the DPC latency, which in turn could cause other problems like audio/video desynchronization or slow network/internet speed. You can read more on the impact of sound effects to DPC latency here. Be careful which settings or effects you enable. If you are using speakers and want to reduce speaker output from being picked up by the microphone then enable Acoustic Echo Cancellation option that's under Microphone Effects. Having the bit-depth set to 24 bit will slightly improve the recording audio quality. The 44.1 kHz (44100 Hz) sample rate is the one used by most media (games, movies, music), while video DVDs use 48 kHz. Set Microphone and/or Line In Default Format to 24Bits, 44100 Hz. Do not set the impedance much higher as it may damage the headphones. If your Realtek Audio solution has a dedicated headphone amplifier, set the soundcards output impedance/gain ( Ω = ohm) to a value close to the headphones input impedance. 
You can find detailed information on audio bit-depth here. Having the bit-depth set to 24 bit will slightly improve audio quality.
Increasing Sample Rate without having a source that’s sampled at a higher rate won’t improve sound quality, in fact, it might degrade it. Set playback Default Format to 24Bits, 48000 Hz this is generally good for most media (games, movies, music) which is sampled at 44.1 kHz, while video DVDs use 48 kHz.Selecting more channels than the number of speakers you have connected won’t enable you to hear more sounds or hear the footsteps and positioning of enemies better in games. For a 5.1 audio system select 5.1 Speaker. Under Speaker Configuration select the number of speakers that you have.In sound card application settings (Realtek HD Audio Manager, Realtek Audio Console):
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