![]() These commands are used for measurement purposes only, and are all commented out in normal use. Finally, there is a collection of muting commands for the six channels we wish to use. ![]() Next, the Left Surround, Right Surround, Left Rear Surround and Right Rear Surround channels are appropriated for subwoofer use by assigning them to a mono summation of Left and Right channels, scaled by 0.5 to avoid digital clipping. The decimal separator is needed in this case, as Equalizer APO interprets an integer value in the Copy statement as a channel number. The first two EAPO Copy commands are used to mute the center and LFE channels respectively, by setting them to the value 0.0. This could be due to a bug in my sound card's driver though. It's been my experience that when using a sound device in 7.1 mode with only two source channels (Left and Right), the assignment of channels that don't explicitly have a source via the Copy command is necessary to avoid intermittent spurious noises. In this setup, the intent is to use the Left and Right channels normally, to also "steal" the four surround channels for subwoofer use, and finally to force the outputs of the LFE and Center channels to zero. # Selective channel muting for measurement only # Mute the center channel and LFE outputs The routing.txt is where we'll direct a mono signal equal to one-half the sum of L and R into the four surround channels. Later we'll use MSO to generate the filters.txt directly from an MSO project. ![]() The Include of filters.txt is commented out via the # symbol. Then the file routing.txt is "included", as if its contents were copied and pasted into the config.txt at that location. In this example, a 10.0 dB attenuation is first applied to all channels. This is located in the C:\Program Files\Equalizer APO\config directory. Using the custom signal routing capability of Equalizer APO, you can "steal" the surround channels (and possibly others) for use with the subwoofers.Įqualizer APO (EAPO) automatically loads a file called config.txt, which specifies filters and other EAPO processing commands. This is done by using only two-channel sources, but configuring your sound device for 7.1 channels. MSO can be used together with the Equalizer APO software to implement a two-channel system with multiple subwoofers, flexible "roll your own" bass management and compatibility with most of the filter types available in MSO. Two-Channel Multi-Sub Setups Using MSO and Equalizer APO
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