Thanks for your suggestion. I have already upgraded on capacitors ( used Mundorf M-Supreme ,over stock caps of Audyn ) , and also had upgraded larger coils on spkrs with silver wires ( Siltech M20G7) . This was all done as I had ordered Custom made speakers from the mfr. BTW, my Spkrs are Cadence ARCA s which are hybrid , electrostat .
The cpas are already put seperatly in the spkr cabinet as there was not so much space on the oard. Coils are fixed on the side ( inside wall ) of the spkr for same reason.
If I had started from beginning with a seperate outside Xover , it would have made lot of sense. Now it may be too late.
Neotech I have seen on partsconnexion . Will also consider , but Mundorf and Duelund looks similar to Siltech M20G7 used in my speaker. The mfr of spkr is still advising me to go for Siltech M20G7 in order to avoid any possible performance issue due to mismatch.