Granted I've never heard an A/V3 or A/V4 ... but I bet the A/V4 sounds a lot like my MTMWW I just completed. It's essentially an A/V3 for the MTM and 2 M-165x actively crossed at 200hz for the WW.
Dynamics, detail, huge soundstage while maintaining pinpoint imaging ... all those are traits of the MTMWW I made. I bet a big part of that is the M-130 drivers not having to reproduce bass, and in that respect the A/V4 should be similar.
Correct me if I'm wrong Danny, but it sure seems like the M-130 excel in this appication.