I'm not exactly sure about the "stereo analog" part of your requirements, but...
You will get two, line level, analog sub outputs from any 7.2 or 9.2 pre-pro...and there are many from Denon, Onkyo, Integra, Marantz, NAD, Anthem etc. These will also provide an internal x-over function (and room correction, to boot), however...
I don't know if the two sub signals are usually summed (i.e. not stereo) or stereo, and I do know that the x-over and room correction is usually managed in the digital domain. Therefore, I'm not sure if any of these these meet either of your requirements. If the digital x-over works for you, you might want to check w/the manufacturer to see if the sub outs maintain stereo integrity. It's quite possible that some do and others do not.
If you use primarily/exclusively digital source material, it's been my experience that the Onkyo/Integra units produce excellent results for music.
You will get two, line level, analog sub outputs from any 7.2 or 9.2 pre-pro...and there are many from Denon, Onkyo, Integra, Marantz, NAD, Anthem etc. These will also provide an internal x-over function (and room correction, to boot), however...
I don't know if the two sub signals are usually summed (i.e. not stereo) or stereo, and I do know that the x-over and room correction is usually managed in the digital domain. Therefore, I'm not sure if any of these these meet either of your requirements. If the digital x-over works for you, you might want to check w/the manufacturer to see if the sub outs maintain stereo integrity. It's quite possible that some do and others do not.
If you use primarily/exclusively digital source material, it's been my experience that the Onkyo/Integra units produce excellent results for music.