

I had a King Duo Gravis previously owned by Tommy Bridges. Yesterday at Dillon's I tried out the YBL-835GD and a Shires Q. I played for about 2 hours straight, and made sure to alternate both the 835 and Q with the King so as to not fool myself about what I was hearing. Both were excellent horns and much easier to play than the Duo Gravis. I was able to get more volume overall on the Shires, and was cleaner in the high register on the Shires. But the Yamaha had better and faster response for me personally and felt more centered. Overall I felt very comfortable on the Yamaha, and decided to get it. My only regret at the moment is that I didn't bother to try the YELLOW brass 835D that they had in stock (more on that below.)
Duo Gravis (left) and YBL-835GD (right)

Today I played the new Yamaha in rehearsal for Beauty and the Beast for the first time. Three different musicians came up to me unsolicited to say, "This one sounds warmer," which were the MD, trumpet, and violin. No one was complaining, they were just telling me the difference that they were hearing.
Buuuuut now I'm worried about it
Is it TOO warm? Too big of a change? Should I have tried the yellow brass version? Is this horn a good fit for this show?
Am I overthinking? (YES.)
Do you suppose the yellow vs gold brass would really have made THAT much of a difference? Or is it more likely simply the difference between two very different instruments? The King is definitely lighter and the brass seemed thinner, so I'd think that would contribute to lack of warmth compared to the 835.
Anyway, more details. I bought the Duo Gravis sight unseen, out of necessity. It's a very good trombone, the slide especially is fantastic. But I am pretty sure the previous owner made modifications to the horn which would help him as a tuba/bass trombone doubler. The first thing I noticed was that the receiver/leadpipe had been modified to take a tuba mouthpiece; my standard bass trombone mouthpiece was INSIDE the receiver all the way up to the decorative throat tooling. I don't think that's a standard Duo Gravis feature(?) He also said something about having had the slide shortened
I've reached out to Yamaha to ask about purchase price for JUST a yellow brass cut bell section. Please note, I'm NOT going to buy one right now, just bookmarking the idea it in case the whole warmth thing turns out to be an actual issue.
As a final note, considering that Beauty and the Beast was a tuba/bass trombone doubling book for a very long time, I would think that warmth would be desirable for this show, providing better blending between myself and the French horn/tracked tuba.
I love my new bass, it is SO much easier to play that it is actually a relief. But I'm feeling insecure because I have little experience with assessing bass trombones (really wish I'd been able to bring someone to listed at Dillon's.)
Feel free to chime in with thoughts, opinions, expertise.