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Headphone sound mono and muffled

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    Aspire R7, Windows 7 - 64bit. Intel mainboard with nvidia graphics card.

    Use to work, but after re-installation and later updates, it suddenly didn´t.

    Sound, video and game controllers show: Intel Display Audio driver and Realtek High Definition Audio driver.

    Playback devices only show "Speakers". It used to show more. And if Intel Display Audio driver is uninstalled, then Playback devices will show 2 HDMI digital devices, but then Speakers become mono.

    In realtek HD Audio Manager -> speaker configuration there´s only stereo. There used to be surround, 5.1 and 7.1 also.

    Installing the latest realtek driver does not change anything.

    Installing the latest Intel HD 4000 graphics driver is impossible. Others have on intel website reported the same problem, that the intel 4000 HD installer alerts that the computer doesn´t match the driver.

    Nvidia HD audio can not be installed. Don´t recall if it did or that was another computer.

    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" are chosen they can be heard but distorted. And if "Headset" are chosen they appear clearer, but still muffled and in mono.


    • Edited by Dude 793 Friday, July 25, 2014 6:19 PM
    Friday, July 25, 2014 6:18 PM
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    Hi,

    This issue can be mostly caused by drivers. The driver issue can also cause the unstable performance of hardware device.

    I suggest you uninstall all Video card and audio drivers, and update Motherboard driver and BIOS firstly.

    Then, in device manager to install the driver for Video card and audio device.

    If it doesn't work, check the event logs in Event viewer to see if there is any related recorder. Post back for our research.

    Kate Li
    TechNet Community Support

    Monday, July 28, 2014 9:22 AM
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    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. But it doesn´t fix sound and playback through HDMI devices are gone, perhaps it requires a HDMI device inserted to work. "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.

    Have already tried a complete fresh install of the system. And the event logs does not report and errors.
    Monday, July 28, 2014 10:20 PM
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    Kindly check the headphone with other audio devices to check working of the headphones. Similarly, connect any other speaker or headphone in the PC to check if the PC's audio port is working fine.

    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. This is because, headsets have 4 contact pins while headphones have 3 contact pins. Accordingly, the connections vary - mainly the ground or common. Hence, in the case of headset connected to headphone jack, one of the channel gets grounded and so the muffled noise is heard. Kindly confirm with Acer support for compatibility of headsets.

    Balaji Kundalam


    Monday, August 18, 2014 3:40 AM
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