Looking for more detail in a speaker


Kind of a long first post but needed the space to set up my situation. 
I decided to do something about my speaker situation after demoing a pair of B&W 805d’s. One of the tracks played was Sympathy for the Devil. At the beginning of the song, a percussion instrument, either a guiro or cabasa, just popped out at me on the left speaker. I’ve heard that song a million times but never noticed that percussion instrument coming at me like that. I came home and played the track through my system, through my streamer and turntable. My speakers are Golden Ear Triton One’s. That same presentation just isn’t there like with those 805’s.
The GET1’s are certainly decent speakers; are they not designed for this type of detailed presentation? Is it my room? My listening room is a odd shaped man attic with a 3.5’ wall on one side with an 8’ wall on the other side peaking a 9’ in the middle. My listening position is about 17’ from the speakers.  I’m sure the room is acoustically challenged. Also, I have a long speaker wire run, like 40’. Does that contribute to the lack of detail? I figured out a way to trim about 15’ of speaker wire length from each run and plan to do that ASAP. I’m using AudioQuest construction rated wire. I believe they’re 14 gauge.
So, why not buy the 805’s? I’ve thought seriously about them but concerned they’ll be kind of small for my room. Seems like I need floor standers. I’d like to keep any replacement speakers at $4k. I have an opportunity to pick up a pair of Dynaudio S5.4s for $4k but haven’t made a move in them yet. 
Any suggestions on a speaker selection or adjustments to my room or speaker wire are appreciated. To sum it up, I’m looking for more instrument detail with good sound staging either by making tweaks to my current set up or getting another flavor of speakers. Thx. 
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Too many variables here to even begin to assess what’s causing the differences you heard.  How big was the demo room you listened in and how close were you to the speakers?  What electronics were the 805s being driven by, and what other equipment is in your system?
As they say, “it’s complicated.” The owner was using a Gryphon Diablo 300 amp, along with some high end speaker wires about 8ft run each. We were about 7-8’ feet from the 805’s. He was streaming through his Apple computer. Don’t know his preamp. I have a McIntosh MC152 amp, C48 preamp, a Mc MB 50 Steamer and a Technics 1200G table with Cadenza Black cart. I think that’s a decent enough system to squeeze some detail out of speakers. Just don’t know how much room dynamics factor with speakers like the GE’s. 
Take a look at the on-axis frequency response curve of the 805 D3: 

https://www.stereophile.com/content/bowers-wilkins-805-d3-loudspeaker-measurements 

In particular notice the 6 dB peak at 10 kHz.  Imo that might make a percussion instrument pop out of the mix. 

Duke