I recently purchased a Dell Latitude E6400 and am experiencing "tinny" sound from the builtin sound card under Windows XP. The current system information on the sound card is as follows:
Name IDT High Definition Audio CODEC
PNP Device ID HDAUDIO\FUNC_01&VEN_111D&DEV_76B2&SUBSYS_10280233&REV_1003\4&380800DF&0&0001
Driver c:\windows\system32\drivers\sthda.sys (5.10.6017.1, 1.32 MB (1,381,914 bytes), 9/20/2008 10:56 PM)
The driver that is installed is the latest driver available for download directly from Dell. The date on the driver is 8/22/2008. Regardless of whether or not I am listening to the builtin laptop speakers or hooking up external speakers the sound level seems to be very low and the output is clear but with very high treble and almost no bass at all.
While investigating possible causes for the problem I have already done the following:
(1) Attempted to install drivers for IDT 92xx compatible hardware. All drivers that appeared to be for my device but were packaged by other vendors such as Intel would error out even before the install was complete.
(2) Reformatted the system and only installed Windows XP SP2 and the audio driver to test.
(3) Hooked up external speakers with subwoofer to the system. System sound/volume level appears to be very low even when it is turned up nearly all the way. Sound is very high in treble with little to no bass output.
(4) Checked all settings for sound devices under control panel. Bass and treble control for IDT Audio devices are grayed out with both set default to the lowest level. The only available settings for the device are volume level and right/left balance.