I have owned 3.5 for quite some years now and recently upgraded the crossover to incorporate the second voice coil.The caps are top tier from Duelund, Jupiter,Audience XO and Mundorf .The inductors are top tier foils from mundorf and jantzen.
These upgrades has taken this speaker to a level I cannot find the words to describe but only that’s it total Amazing.
when the second voice coil is incorporated into the speaker as a whole unit it’s a total game changer.
My crossover now is external and sits on the floor and I can disconnect the second voice if wanted for comparison in fact I can disconnect the total crossover and I have designed it so it fits into the shipping cartons.
The internal wire has been upgraded to Omega Mikro ribbon wire. Ron Bauman at Omega Mikro has extensive knowledge on the Gallo reference speakers and their design. He is an extremely nice gentleman and is a pleasure to chat with.