2.0 vs 2.1 for pseudo-subwoofer

I'm currently experimenting with bi-amping setups. I use the a/d/s/ 642ix automotive electronic crossover as an active crossover. It has a feature which allows the subwoofer signal to be fed to the main speakers when played in 2.0 stereo mode in lieu of 2.1, that is why I called it “pseudo-subwoofer”. The subwoofer signal is filtered at 100 Hz with a slope of 24 dB/octave. The issue is that the main speakers are playing in stereo, but the subwoofer signal can be selected between stereo and mono. Which one should be used?
 
I think you end up using same as old style plain "stereo" 😉

Why looking for a complex way to make simple things?

Besides, plain stereo is often mixed that way, sending basically same signal to both channels, given that at very low frequencies directivity gets lost (the main reason allowing a single subwoofer in an otherwise stereo system).

In a nutshell: play regular unadorned Stereo and keep your life simpler 🙂
 
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Not sure if I understand your question properly. If you are bi-amping and using a single subwoofer for a 2.1 setup, then you should use the mono selection as the crossover has a summing circuit, combining the L and R signals into mono for the sub. That’s how my active crossover filter works.
 
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Not sure if I understand your question properly. If you are bi-amping and using a single subwoofer for a 2.1 setup, then you should use the mono selection as the crossover has a summing circuit, combining the L and R signals into mono for the sub. That’s how my active crossover filter works.
I think my setup might be considered equivalent to the 2.2 system where there are two subwoofers used with each left and right main speaker. So, the issue is to choose between mono or stereo signal would be fed to these two subwoofers.
 
I think you end up using same as old style plain "stereo" 😉

Why looking for a complex way to make simple things?

Besides, plain stereo is often mixed that way, sending basically same signal to both channels, given that at very low frequencies directivity gets lost (the main reason allowing a single subwoofer in an otherwise stereo system).

In a nutshell: play regular unadorned Stereo and keep your life simpler 🙂

Actually, there shouldn’t be that complex. But, the user manual has left me perplexed. It suggests using mono regardless of how many subwoofers are used and stereo when the crossover frequency is above 100 Hz.
 
I assume you can adjust the crossover frequency. Then you should probably follow the manual instructions. I think they imply that below 100Hz the subwoofer sound cannot be localized and therefore does not matter really if you use stereo or mono to the two subwoofers.
But let your ears decide.
 
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