Incidentally . . . . I worked for a sound contractor back in the day who was a very early adopter of RTA to 'shoot the room' to speed up set-up in the 10 to 30,000 seaters we were doing.
I got to play around RTA-ing my bass rig.
Don't go there.
Bass loose in any room, from your bedroom to large venues is like trying to catch a greased elephant who is deep in the throes of mating season. There are traps, there are hot spots, and 'standing waves' actually look like those Weather Channel shots of the beach right before the hurricane comes in. . . . and the next minute in a different frequency is resembles lava flowing uphill. It quickkly became a question of 'what do you want to sound like where', inevitably resulting in a correct tone setting to accomplish that, inevitably resulting in a setting that was just horrible standing in front of it. That was 25 years ago, I HOPE it's better now.
It's no wonder that Jimmy talks about not having a rig on stage to aggravate the FOH guy's job is certainly the preferred way to go, it's just very hard to control.
Next time you play a big room, if you're on a wireless, walk all around the empty room and you will be dumbstruck at just how much it varies from spot to spot, and remember it will be utterly different tonight when it's full of people.
I even have to find the 'sweet spot' in my practice room. I never conquered this, and is a big part of why I refuse to play out any more, I could never hear myself properly.
I would posit it is gonna take way more than the bass rigs that are around now, and enough computing power to rival the NSA to truly solve this for me.
J o e y