As others have mentioned, integrating the sub to the main speakers is not easy. For time-phase coherent speakers, it's even more difficult. I think that is why Vandersteen chose to integrate the sub into the main speakers so at least you have some control over how the sub will be integrated to the main with your own DSP algorithm.
I personally think deep bass is important. Now I don't mean earth shattering bass that vibrates your windows, but I mean the speakers able to reproduce the low frequency portion of the recording such as capturing the recording spaces to make the listening experience more authentic.
I personally think deep bass is important. Now I don't mean earth shattering bass that vibrates your windows, but I mean the speakers able to reproduce the low frequency portion of the recording such as capturing the recording spaces to make the listening experience more authentic.