It's a YSL-8820R Custom Xeno Trombone and It's the nicest thing I own. It's a yamaha large bore trombone and the larger the bore the darker the sound and the smaller the bore the brighter the sound it makes. I play in my school's Symphonic (classical) and JV Jazz Band(pretty self explanatory) and for a classical setting you would want a darker and fuller sound. For jazz you would want a brighter and sharper sound. If you have a large bore instrument and want a brighter sound you could change your embouchure ( the way in which a player applies the mouth to the mouthpiece of a brass or wind instrument.) It's the cheapest way to get a brightest sound but definitely takes more practice and work to get the sound you're looking. You can also changes the brightness and darkness of your tone with different mouthpiece. Having a different mouthpiece for concert band and jazz band makes the biggest difference. The deeper mouthpiece will be better for making a darker sound and a shallow mouthpiece will contribute to a brighter tone. If you really want to make a difference in your sound you can get a different horn. For example the horn I would get for jazz would be the YSL-897z, the YSL-891z, or a nice silver sonic King 2B trombone. All of these are small bore horns and will produce bright and sharp sounds. So, If you want a brighter or darker sound you can change your embouchure, your mouthpiece or your horn.
You can find my horn and some of my favorites on Yamaha Instruments.
