This is the second part of a guide on using AC3Filter in Media Center to control SPDIF volume. A common problem among Media Center users with an external digital receiver using SPDIF for output. AC3Filter can solve this problem by controlling the gain on the SPDIF stream before sending it through to the receiver. Now that we have AC3Filter working in Media Center by following this guide, lets get AC3Filter settings ready to control the volume level.
Access AC3Filter’s configuration from the start menu. The first setting to change will be the number of speakers in your setup. Using the drop down box select the correct speaker setup for your system. Then enable SPDIF output to enable AC3Filter to output a digital stream via SPDIF.
Next go to the “Mixer” tab and in the options box make sure that Auto Matrix is selected. Expand Stereo will enable stereo streams to be output as full surround. Normalize Matrix and Voice Control will balance volume output among all the channels and during large volume changes in the stream. You can also control the Bass Output Cutoff from this panel.
Finally, we have to allow the AC3Filter to output a modified SPDIF stream. To do this go to the SPDIF tab and uncheck all SPDIF pass-through options. Pass-through tells AC3Filter to send an unaltered stream directly to the receiver, turning these off allows AC3Filter to alter the gain which will simulate volume changing. If this doesn't work you can try to send a PCM signal through your soundcard or disabling the AC3 Encoder, though in many situations this can break DD and DTS encoding depending on your hardware. Differences in sound card hardware and recievers will alter the viability of this hack.
That should be all there is to enabling your Media Center to control the volume of SPDIF output using AC3Filter! If you experience any problems make sure that AC3Filter is the preferred codec using this GraphStudio guide. More options on enabling AC3Filter to be the preferred codec can be found under the System tab in the AC3Filter configuration.
Troubles, successes, or experiences with AC3Filter you want to share? Leave note in the comments below!
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Tagged As: ac3filter, codec, graphstudio, spdif, windows 7
One of the main problems encountered by those who use SPDIF output on their Media Center is the inability to control volume through the PC. The most common solution is to control the volume through the receiver but this means using a different remote (or worse getting up to turn the knob!). A solution to this problem is to use AC3Filter to control the gain of the SPDIF output. This will allow you to artificially change the volume of the digital output through Windows.
