Use to work, but after re-installation and later updates, it suddenly didn´t. Post back for our research. Similarly, connect any other speaker or headphone in the PC to check if the PC's audio port is working fine. Sound, video and game controllers show: Intel Display Audio driver and Realtek High Definition Audio driver. Open Control Panel, go the Sound section. The sound quality of the headset depends greatly on how it seals in the ear canal. Under Input, ensure that the correct microphone is selected, then click on Device properties. It was possible to update Intel HD 4000 graphics driver and Intel Display Audio driver, but only by selecting find driver on computer and pick driver on a list and "have disk..." selecting .inf in folder. Don´t recall if it did or that was another computer. And if Intel Display Audio driver is uninstalled, then Playback devices will show 2 HDMI digital devices, but then Speakers become mono. Accordingly, the connections vary - mainly the ground or common. In realtek HD Audio Manager -> speaker configuration there´s only stereo. This issue can be mostly caused by drivers. 2. Kindly check the headphone with other audio devices to check working of the headphones. Installing the latest realtek driver does not change anything. Playback devices only show "Speakers". the connections vary - mainly the ground or common. But it doesn´t fix sound and playback through HDMI Click the Enhancements tab and tick the Disable Sound Effects box. Try the different ear inserts and see if one allows better sound. As long as you do not have them set as a communications device, they should sound good. Installing the latest Intel HD 4000 graphics driver is impossible. Aspire R7, Windows 7 - 64bit. Others have on intel website reported the same problem, that the intel 4000 HD installer alerts that the computer doesn´t match the driver. Then right click on the device and there will be a Properties option. But headphone sounds are muffled and mono, and when plugged in there is a popup selection of "Speakers", "Headphones" or "Headset": If "Speakers" are chosen then the voices are completely cut, if "Headphones" I suggest you uninstall all Video card and audio drivers, and update Motherboard driver and BIOS firstly. If it doesn't work, check the event logs in Event viewer to see if there is any related recorder. "Intel Display Audio driver" sounds a little strange, since it is an audio driver that replaces the default High Definition audio driver and not anything graphics. This is because, headsets have 4 contact pins while headphones have 3 contact pins. Intel mainboard with nvidia graphics card. If you're using a headset (i.e., headphones with mic), the muffled noise is common if the computer's audio port is desinged for headphones alone and not for headsets. With mine if I put a little downward pressure the seal is better and I hear really good base.. And if "Headset" are chosen they appear clearer, but still muffled and in mono. Hence, in the case of headset connected to headphone jack, one of the channel gets grounded and so the muffled noise is heard. 3. Then, in device manager to install the driver for Video card and audio device. Nvidia HD audio can not be installed. The driver issue can also cause the unstable performance of hardware device. It used to show more. Click on the Sound control panel which is usually on the top right. There used to be surround, 5.1 and 7.1 also. This is because, headsets have 4 contact pins while headphones have 3 contact pins. Right-click the Sound icon in the System Tray and select Open Sound Settings. Kindly confirm with Acer support for compatibility of headsets. How To Fix Microphone Sounding Muffled Or Quiet On Windows 1. are chosen they can be heard but distorted. 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