Passive vs. active crossover?


I know I am beating this to death , sorry but it's my nature just look at my turntable I never stop.
So my question is : my system sounds incredible now, I have my preamp output going into the sub's input and a high pass going from the sub to the power amp. But it is single ended and I prefer running my pre to power with balanced. Will it be easy to make a filter that removes say around 40 hz on down using balanced ic in a passive circuit. Or should I stick with active? And which one?
pedrillo
To go from single-ended to balanced with passive components would require use of a transformer. Don't waste your time and money.
I highly recommend the Marchand XM-44, because you can tweak the slopes and crossover points. I went with the upgraded attentuators with one-half dB's per click. Mine has no noise problems. Mr. Marchand knows what he's doing, and will advise you well vis-a-vis choosing the optimum slope, etc.