but if I had not built my own speakers my spend would be around 1/3rd in room acoustics, electronics and speakers.
If I take into account, the stands for my stand mounts and sub (speakers I also built), I’m probably close to the same as @erik_squires says about his system spend.
In my case though I would also bundle in the furniture I’m building in with the room acoustics budget (which I have so far built).