My earlier comments were not to bash Bose, they are what they are, they meet their design goal. The 901 variants can sound stellar when properly set up.
I must have zero knowledge about proper setup of 901s.


Like you, my comments also aren't meant to bash, but are indeed my perspective and experience with the Bose 901s.
A good buddy from work had a pair of 901 series IV driven by a Pioneer receiver of the day, and likely an average turntable and midrange needle (don't recall). I was just getting started in audio, and he was way ahead of me. I had what in hindsight was a pretty decent entry level high end pair of speakers called Mariah LS2s, on an early 80s Technics SA500 receiver. I knew the Bose handled a ton of power, but was never much impressed with the sound that "Mike" was getting....he was happy so I was happy for him. I didn't have the insights and the reference point back then to identify what I didn't like, but I knew it wasn't what I wanted hear in a system.
Fast forward about 12-15 years later, and I'm heavily into audio, and am building and repairing lots of speakers as a side gig. By now my system was a pretty nice Lazarus preamp, a Distech amplifier (B&K ST-140 mod), driving an impressive imposing pair of Merlin IVs...(the big daddies!), Cardas and Kimber wire throughout, and a tricked out modified AR-ES1 TT w/the Premier MMT arm...all in all a fairly nice reference system of that era for a working stiff in his 30s. The point of all this prefacing? A pair of 901 series 3 came into the shop for woofer re-coning/repair. The 18 drivers take a while, but its straight forward stuff and the job gets done. I fire them up to check function, and get a serious pit in my stomach! I really thought I had done something very wrong.

For the next several hours I thump on them with bass heavy tunes for a few hours to break in the surrounds.....give them another go but they still sounded awful. I was really struggling with charging the guy what was a considerable sum at the time

. I went to bed that night and literally dreamed about what I had done to his speakers, and how I was going to face him. Got up the next day and visited Sounds Great to hear the new Series VI, just to get a reference. Hhhhmmm...they sound a lot like the Series 3 that I'm hearing at home, so I'm actually a little relieved I hadn't messed anything up! I had installed the EQ he supplied, set everything mid level, and experimented from there....nothing remotely close to what I consider good sound. I set them up on the stands, around 2.5 feet from the rear and a 2-3 feet from the side walls, as my room allowed....my wires, my amp, my system. Maybe I missed the setup, but at least I knew they worked. Anyway, the gentleman picks up his speakers in a couple of days, then calls me back within a few hours. "Uh-oh", I think to myself after I say hello

. Customer speaks loudly, ..."These things sound great!!!!" "They've never sounded this good!" He's in Heaven! ...and now, so am I!

Repeat the story about year later for another customer...minus all the panic about ruining them, and I get similar comments - "Love the new woofers", "Never sounded better", "Thanks so much!" My jaw drops...I was absolutely amazed at the love for these speakers that I thought I had really boogered up!
In fairness, I've heard 501s, 201s, and 301s that I liked better than the 901s, but honestly nothing I'd ever recommend or buy. Also in fairness, I'm open to the fact that I just haven't heard them done right yet. My view is pretty negative, and I know it sounds harsh to some, sorta like calling a guy's best girl "ugly". (Honest...I wouldn't do that!) But the window opened up here, so I was hoping all honest views would be welcome. For anyone who loves the 901s, I apologize for any wincing caused. It's just how it all went down. That said, I also realize that we all love different things for different reasons, and I will support someone's pursuit of the experience you get when you really love how your system sounds. No one needs my blessing to enjoy what they have. Cheers all!