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Support => Questions => Topic started by: SurfRat on November 10, 2020, 01:56:22 PM

Title: "upmix stereo to 5.1" does it change audio in anyway, or only the routing?
Post by: SurfRat on November 10, 2020, 01:56:22 PM
Hi,

I have a SoundBlaster Z (5.1 audio). I have 2 monitor type speakers and 3 surround type speakers and a sub connected. I wish to play stereo music via MusicBee. If I use MB in stereo mode my sub has no audio. This is a problem with the sound card as it does not have 2.1 audio.

To get audio out my sub I can set the sound card to 5.1 and use MB's "upmix stereo to 5.1" with the surround speakers switched off. This works and I effectively have 2.1 audio.

I want to know if the upmix setting changes the audio in any way?
Does it only route the audio to the other speakers?

Thanks

Mark.
Title: Re: "upmix stereo to 5.1" does it change audio in anyway, or only the routing?
Post by: SurfRat on November 12, 2020, 08:36:33 AM
I did some research into the BASS audio library https://www.un4seen.com that MB uses.

There are two ways to do up mixing:

1. simple/efficient way to do that is to mirror the channels via BASS_ASIO_ChannelEnableMirror.
2. Using a Matrix. https://www.un4seen.com/doc/#bassmix/matrix.html

Both just mirror the channels with no audio manipulation.

Until I hear otherwise I am summing the audio is mirrored to the other channels and no audio manipulation takes place.


Title: Re: "upmix stereo to 5.1" does it change audio in anyway, or only the routing?
Post by: Steven on November 12, 2020, 09:18:31 AM
MB uses the mixing matrix