Good to see you are trying the Arche's.
Don't know if they are still in production but years ago I tried/liked a small Gallo sub (TR2) with various widerange single drivers (including 3"-4.5" Japanese drivers).
Also tried it with their little "ball" speakers.
Think the sub's crossover defaulted to 100Hz when using the speaker cable connections (adjustable when using the low level connection).
DeKay