Preamp with two volume controls?

Thank you for all the help and I am looking into all the suggestions with some success. My description may make no sense, but my reasoning is solid for what I want out of my system. My room is very large and I have built a left and right speaker array using Klipsch Heritage speakers. A set of Khorns, LaScalas, and Heresy lll speakers. I have modified the big boys to have the same speakers and crossovers and left the Heresy speakers stock. Hence the 2 Mac 252 amps and the Anther STR for the Heresys. First C50 gets a balanced output from my Marantz SACD11S the second C50 gets the rca output. The subs are sprinkled throughout the room and yes, they do have volume control through their  app, but that is not as helpful as you would think with 3 subs. The gain on the subs are adjusted to integrate with the heresy speakers which are powered by the Anthem. C50 number 2 runs the subs and small speakers. This gives me full control over how much bottom end I am hearing in my room. Once all the phase issues were worked out this experiment really worked out. The preamp I am looking for would have different volume controls not for different channels but for different outputs. Preferably a control for sub output. Once again thanks for everybody's input.

You shouldn’t change the subs’ gain once matched.

I used to do it remotely with a MCM 50-8394 before I wised up. You really just need RC EQ so you can change it for each track. Or a simple RC gain control as above.. Or just keep overspending and convincing yourself it’s the best way. I don’t think you will find what you are looking for as it has no reason to exist.

First Sound preamps are quality units with left and right volume controls it that's what you're looking for.

https://www.firstsoundaudio.com/

Older Don Sachs have dual volume control 

That was it.

Audible Illusions.