There seems to be this myth that rear passive radiators mean you can place the S400 closer to the rear wall than ported speakers.
You can't. The radiation is the same, passive radiators just don't have the noises.
If you are placing any speaker 5" from the wall, you'll need speakers that are designed for wall placement, or active Room EQ.
And if you are using them as near-field monitors, you won't get room-filling sound anyway. That's kind of the point of near-field monitors.
I'd also think a coincident monitor like a KEF would be better near-field.
Or the Neumann KH80.
You can't. The radiation is the same, passive radiators just don't have the noises.
If you are placing any speaker 5" from the wall, you'll need speakers that are designed for wall placement, or active Room EQ.
And if you are using them as near-field monitors, you won't get room-filling sound anyway. That's kind of the point of near-field monitors.
I'd also think a coincident monitor like a KEF would be better near-field.
Or the Neumann KH80.