Stereo pre-amps with dual outs for bi-amping and a subwoofer line out


Do they exist? Maybe I’m looking in the wrong places, but I haven’t seen any. 

Definitely not looking for an integrated or AV Receiver.
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You can run each ic to the sub's line input, then each ic from the sub's line output back to your monblock  amps.Not all subs have a line output but they aren't hard to find.This is how mine is set up.
And if you don’t prefer a Parasound preamp, look at their Halo poweramps that have a preamp (passthrough) output.