Integrateds with bass management?

Here's a different question on a popular theme: are there any integrated, two-channel amplifiers that offer bass management?

I know that plenty of models have line level pre-outs (my Plinius 8100 included) but I have never heard of one that will direct high frequencies to the speaker outputs and bass information to the line level outputs.

You would think, since subwoofer popularity seems to be increasing, that manufacturers would include this feature.