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I'm on an Aspire V15 Nitro, VN7-591G with GTX860M graphics.
For the first few weeks of use, the speakers were consistently loud and crisp, producing excellent sound thanks to Dolby Digital Plus Home theater.
However, at some point, I noticed that the Realtek software and the Dolby software appear to be conflicting each other, with the Dolby enhancements turning off when I do certain things, forcing me to turn it on again to get good sound.
After the upgrade to Windows 10, the problem is still there, with signs that when I use the volume slider, activate Cortana, or do a sound test in Realtek Audio Manager settings, the Dolby software turns off and then turns on again when I do something else. This sounds like a conflict between the Realtek software manager and Dolby DPHT.
I tried reinstalling, updating the Realtek driver, and also tried reinstalling the Dolby software included in the driver package manually, but in the end it all goes to the same problem that Dolby Digital Plus turns itself off sometimes.