Not sure where to get this EQ you are talking about.. Ebay??
Price?
The WBer experiements set me back, audio budget very tight.
So what is your purpose of testing EQ in your lab.
To ck to see where a speaker is weak?
I am not sure what the reason is testing EQ?
I am sure if I hook the W8 or W4 or even my complete 4 way speaker to some EQ gadget, like having say 10 EQ levers,, I am sure the sound,,or lets say, some fq ranges that I perfer might geta boost in some recordings.
But then the musc has to pass through this gadget = more distortion.
EQ gadget may boost FQ's, but adds distortion.
The EQ thing on the Onkyo sounded better in off mode.
Not sure why you don't play around with the davidLouis VX6 and add in a TB W3.
Then add a pair of DavidLouis Magnesium 8's per cabinet and then add in the Davidlouis Be/Nd tweeter.
25cm , not the 28.
I think you''ll be pleasantly surprised.
That combo will beat my system, perhaps, ,,
magnet system is a beast.
IMHO Magnesium is the best cone material to intergrate intoa WBer system, as its neutral /not warm. vs paper types which i don't like.
I know you offer paper 10's, not my cup of tea. Too muddy/boomy.
https://www.ebay.com/itm/324521174123?hash=item4b8ef8246b:g:BFIAAOSwoRRg1EKi