Adjust RCA level with wireless remote control?

[King Mustard]

I have a Wharfedale Diamond SW-150 subwoofer, which does not have a remote control.

Unlike my previous AV receiver, my Yamaha HTR-2071 does not have subwoofer volume up and down buttons on its remote control. You have to go into menus to change it, which is annoying.

Is there something cheap I can pop between the subwoofer and the AV receiver (basically, an RCA passthrough) that lets me adjust the subwoofer with a wireless remote control?

I can't seem to find anything online.

 

[King Mustard]

Have you thought about using the control app?

Neither my AV receiver nor subwoofer support Wi-Fi, so I'm a bit confused.

 

[King Mustard]

Why do you need to? Once it's setup it should be left alone.

You'll need a single channel ir controllable preamp.

I like different amount of bass depending on what I'm viewing (film, music, game), what time it is (other people are in the house) etc.

I'll look into one of those - thank you!