1/2" is pretty small, but placement certainly matters a ton. The impact from a change in toe-in is a significant factor too. There are a lot of variables, and your room and circumstances are unique, so everyone’s results will vary, but I’ve heard notable differences from small adjustments of an inch or so and minor angle changes.
So, of course, after a hard day’s work, I had nothing better to do than futz around with speaker placement. After some trial and error, I found that my speakers (JA Pulsars non-graphene) work best when pointed straight ahead with no toe-in. When placing them, I inadvertently put the left speaker about 1/2" closer to the side wall than the right speaker. They were previously exactly the same distance from each side wall. With this new, slightly unequal placement, the speakers completely disappear. This was confirmed by my wife who, without any prompting, told me that the music now seems to be coming from out of nowhere, whereas it was directional previously. I can’t explain this phenomenon ... does 1/2" really make that much of a difference? HEY, turn off your dirty minds.Any opinions would be welcome. Thanks.