Not snake oil, but many people buy stuff that they may not need, blind and expect miracles.
The only way to really assess a listening room is to have someone with the gear and software they need come and test the room, preferably with all the furniture in it that you want already.
I lucked out - I had an arched false ceiling already, which solved some of the issues I might have had, and a live wall (glass doors) that we solved with some heavy acoustic curtains.
I could easily have spent many times as much on supposed 'improvements' if I hadn't actually had the room tested
My advice is to pay the money for testing and see whether you have any issues - many can be addressed relatively cheaply. There is probably a home theatre business near you that can do it, (though they'd rarely be called out for pure audio).
The only way to really assess a listening room is to have someone with the gear and software they need come and test the room, preferably with all the furniture in it that you want already.
I lucked out - I had an arched false ceiling already, which solved some of the issues I might have had, and a live wall (glass doors) that we solved with some heavy acoustic curtains.
I could easily have spent many times as much on supposed 'improvements' if I hadn't actually had the room tested
My advice is to pay the money for testing and see whether you have any issues - many can be addressed relatively cheaply. There is probably a home theatre business near you that can do it, (though they'd rarely be called out for pure audio).