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Got a response from EVGA support, the official word is that this card will NOT have a native crossover.

Pretty sure you have tried the Windows Bass Managment and if you haven't, let me tell you that it does some heavy processing on the audio in general and delivers a horrible audio quality.

This is where APO Equalizer (Is not just an equalizer) comes in:

https://sourceforge.net/projects/equalizerapo/

What can you do with Apo? Downmix, upmix, copy channels, apply filtering, increase/decrease db on channels, combine settings, etc...


Installation:
a) If you have the Nahimic installed then you need to uninstall everything, reboot and reinstall without nahimic and reboot again. (To enable Audio Enhancements that Apo needs)
b) Install Apo Eq, open it and it will tell you it needs to install something and reboot, do it.


Bass Redirect

Send the low freq. to the subwoofer, on this example i'm sending the audio from the L R channels and apply a crossover of 60hz or 80hz or 120hz.
Usually a crossover gets applied to the audio we are playing altering the original audio but Apo let us copy those L R channels into virtual channels and there apply the crossover and sent it to the subwoofer leaving the L R channels untouched. The script also apply a -10dB to the bass signal to lower the output volume a little.

Apo let you see how the written 'code' looks like:

https://imgur.com/EUvfsAA

You need to create a .txt file with this settings:

Copy: BASS=L+R
Channel: BASS
Filter: ON LP Fc 80 Hz
Copy: LFE=LFE+-10.0dB*BASS

You can change "80 Hz" for any freq. you want and the output volume.

On the Apo interface remove everything with the - symbol and add new entries with the + -> Control -> include to load the txt files.

https://imgur.com/pu1kmw5

At first i found it confusing, when is ON and when is OFF?, if the square is blue is ON.

https://imgur.com/Mo3Nxjc

Bass boost

I increased +3dB on the 120hz freq. and lowered the general volume -3dB to avoid any possible clipping, keeping the general volume at 0dB. I chose to apply this increase on all channels except the Central and Subwoofer channels, if you only want for the front speakers, just delete RL RR SL SR.

Preamp: -3 dB
Channel: L R RL RR SL SR
GraphicEQ: 120 3

https://imgur.com/OL8osd7

Thanks to this guide for letting me know Apo.

https://inspiringheadphones.com/equalizer-apo-quick-and-easy-guide-to-more-bass/

The Peace Equalizer interface is a lot better to work with if you want to test and manage different presets with the equalizer-only.



Surround Replica

Copy L R to all speakers:

https://imgur.com/xh3bSpE

For a 5.0 configuration, copying both L+R on the center channel and just L for RL and R for RR, you can adjust the gain on the Nu Audio interface for each speaker or with Apo.

Copy: C=L+R RL=L RR=R

For a 7.0 configuration:

Copy: C=L+R RL=L RR=R SL=L SR=R

Tips

#1: The filters will be applied in order, i found that the order is inverted... the first one is actually the last one... why? i don't know, for example:

Placed1: -3dB
Placed2: Surround Replica
In this order we would assume Placed1 is going to apply -3db to L R and then Placed2 replicate that change to all speakers but it doesn't.

This would be the correct order:

Placed1: Surround Replica
Placed2: -3dB

#2: After pressing ON you can close the program and even reboot, the setting will still be applied you don't need to open the program again.