preamp with two adjustable outputs??

Mainly, frequency roll off.

A great preamp that can be had for little money is the Aloia 11.01 with Inductive power supply. They do show up and can be had for $900 - $1100.

Has what you are looking for.

Bill

If you are saying that there is no way to adjust the crossover frequency at the sub, then you are going to have a problem w/o an external crossover. There will be overlap unless the natural roll-off or low pass frequency of the sub mates with the natural roll-off of the mains. Its possible, but unlikely. Another option would be to use an HT/SSP that has bass management as a pre-amp, OR get a Velodyne SMS that will function as a parametric EQ and RTA to get the bass matched btwn the bottom of the mains and the top of the subs.

I didnt understand you wanted to run a sub and needed the filters.......sorry

Contact TacT Audio.
Custom pre can be design to meet your needs...... or look for 2.2X on used market. That unit also includes room correction feature which you may find very useful.