[jasonwatkinspdx]

Cross ear perception of the other speaker is actually desirable, unless you're specifically mixing binaural for headphones. Crosstalk is key to localizing the apparent acoustic image in front of the listener instead of "inside the skull."

If you mix purely on headphones, you can just put a quick filter inline that does a reasonable job of simulating it. Without this you'll have difficulty mixing things well for playback on speakers.

[blub]

What filter do you mean? I'm aware of hardware which simulates it, but it costs around 2000 EUR.

[SNACKeR99]

See the plugins here, for example: https://www.pro-tools-expert.com/production-expert-1/2016/5/...

[jasonwatkinspdx]

Here's a classic reference on it: https://www.linkwitzlab.com/headphone-xfeed.htm