Last lemming
I would at least try Randys advice above ,
you can get a ball park idea of timing etc.
My take on this is consider the measurements of Vandersteens
They are by design a unique product of form following function and considered superlative.
A quick look and a Zu product there is a forest of stored energy within the Box design. Of course you may be taken by the fashion of the design.
Some other thoughts to consider take 3K and check out a pair of the new Belles Aria Mono Blocks.
Run some AQ wires and interconnects to your existing Vandersteen speakers make sure you have a decent Phono stage.
The Vandersteens in my opinion are a more sophisticated foundation to build on allowing you in the long run to achieve more solid performance.
Dealing with your set up tilt back,Bases filled and snug, proper power response speaker position, perhaps wider spacing speakers, reading manuals
doing the basics etc.
I have seen many come full circle with Vandersteens, chase their tail in denial for years and come back home to music at mamas.
JohnnyR
Vandersteen dealer