One thing to consider, by having the speakers right next to each other this will affect their sound, mostly in the low frequencies. For example, bass can be changed or reinforced by what is around the speaker, like walls or other speakers.

I guess what I'm saying is that the speakers won't sound the same as soon as you move the other speaker out of the way, or change the position of the speaker in relation to the walls around it, this may account for why the the bass sounds different between the two.

Also, I have never heard of Virtual mode, I use "Stereo" or "Direct" modes when listening to music.


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