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More => Old Versions => JRiver Media Center 21 for Windows => Topic started by: keylimesoda on January 04, 2016, 12:31:59 am

Title: Downmixing 2 channel into mono in a 2 channel container?
Post by: keylimesoda on January 04, 2016, 12:31:59 am

Interesting quirk here.  I'm trying to bi-amp a single/mono speaker with active crossover.

This means that I'd like the audio to collapse to mono, but then to output into two channels (high->right, low->left).

With the current DSP Studio, when output is set to mono, the convolver appears to only be able to output a single-channel stream.

It looks like the output format has the ability to downmix 2 channel into a 4 channel container.  Is it possible to add a configuration that does downmixing 1 channel into 2 channel container to allow for active crossover on a mono speaker?

Title: Re: Downmixing 2 channel into mono in a 2 channel container?
Post by: blgentry on January 04, 2016, 08:15:17 am

I'm pretty sure what you want is possible with a 2 channel output.  You can do this through the parametric EQ section.  I would do the following parametric EQs:

1.  Adjust volume, -6 dB left, right
2.  Mix channels:  Add right to left
3.  Mix channels:  Copy Left to Right
4.  Remove high frequencies:  Left
5.  Remove low frequencies:  Right

Steps 1 - 3 sum left and right to mono.  4 and 5 apply the high pass and low pass crossovers to each channel.  I think that's what you want.

Brian.

Title: Re: Downmixing 2 channel into mono in a 2 channel container?
Post by: keylimesoda on January 04, 2016, 08:37:32 pm

I'm using the convolver for the crossover (some other driver compensation built in using complex FIR filters).  So if I can sum both channels to mono using the EQ instead of the downmixer, that should work.

Works great.  I'm probably wasting some processing power convolving a channel I'm just throwing away, but the processor overhead is not a significant issue in this application.

Title: Re: Downmixing 2 channel into mono in a 2 channel container?
Post by: mattkhan on January 05, 2016, 03:12:03 am

Quote from: keylimesoda on January 04, 2016, 08:37:32 pm

I'm using the convolver for the crossover (some other driver compensation built in using complex FIR filters).  So if I can sum both channels to mono using the EQ instead of the downmixer, that should work.

Works great.  I'm probably wasting some processing power convolving a channel I'm just throwing away, but the processor overhead is not a significant issue in this application.

You can do the same directly in the cfg file, no need to use peq in that case