Does anyone make a preamp with a subwoofer output?

On my HT receiver, there are subwoofer outputs that I can adjust where the sub rolls in and out.
 I was wondering if there were some two channel preamps with the same feature. Currently I’m running my two channel sub from an ARC preamp, bwo AQ “Y” adaptors and it sounds okay, but I’m sure I can do better.

Thanks.

JD