The creative driver seems needed for AC3/DTS to be passed through the SPDIF port correctly, but it gets out of sync. The latency seems to be definatly produced by the creative driver alone. I would believe this is what makes the system identify the SPDIF as a multichannel supported port and makes passthrough in ffdshow for AC3/DTS possible. The native driver does not allow for any configuration of the soundcard, the creative driver allows one I suspect is key and it is the setup for 2/0 or 5/1 output mode.
DTS DECODER DRIVER XFI WINDOWS 10 DRIVERS
Maybe the Microsoft USB Drivers does not recognize it as a SPDIF interface? With the creative drivers (beta or vista) the secound audio interface is listed as "SPDIF-Out - SB X-Fi Surround 5.1". With the default windows driver I have no way to set the card to 5.1 as in the beta driver, i suspect this is why ffdshow spdif passthrough of DTS/DD does not work. With the beta driver installed this works as normal also on Windows 7, but i get the latency problem.
DTS DECODER DRIVER XFI WINDOWS 10 MOVIE
This normally works and does as well under Vista to enable DTS/DD passthrough for multichannel on movie files / DVD etc.
![dts decoder driver xfi windows 10 dts decoder driver xfi windows 10](https://s3.manualzz.com/store/data/024585245_1-a4f0f7ede0e6b070562fcd4bda0e0d00.png)
I normally use ffdshow to enable DTS and AC3 passthrough, as the creative dolby digital live pack does not support the usb x-fi surround 5.1 (although i bought the pack). SPDIF passthrough works with the beta driver. There is no option in the default windows driver to set the device to 5.1. However with the default windows USB Audio Device driver I am unable to passthrough SPDIF Dolby Digital/DTS signals and only get a stereo signal to my reciever, if I try enable SPDIF passthrough I get no sound. I am using the "Digital Audio Interface - SB X-Fi Surround 5.1" as default as I have the soundcard connected with TOSLink to a Pioneer multichannel reciever (VSX-D811). Both are working properly and the latency is gone, so this must be a creative driver issue. Windows now has two devices "Speakers - SB X-Fi Surround 5.1" and "Digital Audio Interface - SB X-Fi Surround 5.1". I also uninstalled the AMD USB Audio Driver Filter (seems to make no difference at all). I tried to uninstall all Creative drivers, with console launcher and use only the native windows drivers for USB Audio Device.