What are your Eureka Moments in this Hobby?

Hello @pmatyskiel Interesting!  My room doesn't really afford many positional changes of the speakers, but I have learned something new from you!  Thanks for sharing!  Perhaps I did this similarly but different.  In the standard position my bass boom was horrible from two subs.  I connected them with REL wireless, and was able to move them around freely.  I found great synergy in spots I never would have imagined! 

My final speaker placement actually ended up being not far off from where I started off in the room. However what blew me away was learning that 1) the speakers did not necessarily end up symmetrical to each other, and 2) that minutely small adjustments can make a huge difference in image, soundstage, and realism. If you have the luxury of flexibility with your room, you really have to try the Sumiko procedure to believe it.

When I and others participated in a blind test.

1st -one was hearing a vacuum tube preamp.

2nd -was getting an amplifier with more than enough juice to prevent clipping.

3rd -hearing vinyl records (Sota and SME)

4th -blending in a Powered subwoofer with my main speakers

Each time I was wowed regarding the sound quality improvements.

@mulveling  I remember when my older brother came home from college his freshman year, 1974, and brought his stereo home, and the speakers were these large Tannoy speakers,  I thought called Era Monitors, with these large dual-concentric drivers.  He told me that they were small compared to other Tannoy speakers.  If you stacked one on top of the other, you're basically looking at a refrigerator in size.  We shared a bedroom at home, well, sort of a space above the garage wth its own bathroom and nooks, but still with two beds, two desks, two dressers, a wall of bookcases and record cabinets, then these speakers come along.  There is something to be said about speaker systems back then, what was considered small.  Smaller speakers today can reach, and in some ways equal, it in bass frequency, but definitely not in scale and scope of something like these.