Actually not a lot....
Take a look at the Room EQ Wizard room simulator.
I've run a few simulations and honestly with an untreated room the benefits of filling in nulls aren't something I can replicate.
If anyone puts together an REQ simulation that shows 2 subs vastly better please point me to it online, I'd love to learn that this is better than I think it is.
Best,
Erik
Take a look at the Room EQ Wizard room simulator.
I've run a few simulations and honestly with an untreated room the benefits of filling in nulls aren't something I can replicate.
If anyone puts together an REQ simulation that shows 2 subs vastly better please point me to it online, I'd love to learn that this is better than I think it is.
Best,
Erik