https://musicalinstrumentpro.com/euphonium-vs-baritone/
The primary difference between the euphonium and the baritone is their bore shape and size. For the euphonium, the bore is conical, and the tubing gradually gets larger from its mouthpiece going to the bell. With the baritone, the bore is cylindrical, the size of which remains the same throughout its main body.

https://hub.yamaha.com/winds/brass/whats-the-difference-between-baritone-horn-and-euphonium/
DIFFERENCES. One of the most significant differences between baritone horn and euphonium is the shape of their bore. The tubing of the baritone horn widens ever-so-slightly towards the bell, although the main body of the instrument essentially remains cylindrical throughout. The tubing in a baritone horn is also thinner than that of a euphonium.

https://www.wikihow.com/Euphonium-vs-Baritone
A euphoniusm has a wider bell and tubing than a baritone. Not only is this a physical difference, but it also results in different sounds. The euphonium's tubing extends past the piston valves and has a conical shape and wide bore, which produces a fuller and rounder sound. Meanwhile, a baritone has cylindrical tubing that's narrow before

https://brasshero.com/baritone-vs-euphonium/
The main difference between euphonium and baritone is bore size. Cylindrical Vs. Conical Bores: Bore size is the diameter of a brass instrument's tubing. Baritones have a smaller bore size than euphoniums, which allow them to have differences in sound quality. A baritone is also a cylindrical instrument, meaning it has a consistent bore size

https://promusicvault.com/euphonium-vs-baritone/
As stated earlier, the main difference between the euphonium and the brass baritone is the bore size. For the euphonium, it has a conical bore. This conical bore has a gradual taper, and produces more of a mellow tone when playing the instrument. the euphonium bore is much larger compared to the baritone, producing a much darker and deeper tone

https://music.stackexchange.com/questions/10370/difference-between-baritone-and-euphonium
Cody's summary of the differences between what you will generally find in an instrument called a "Euphonium" vs. one called a "baritone" is mostly spot on for today, but traditionally there really wasn't a difference between the two and it is a recent phenomenon where the high-end instruments are called euphoniums while cheaper student instruments are called baritones.

https://brassnwind.com/euphoniums/euphonium-vs-baritone-compared/
Baritone horn bells range between 8.25 and 10 inches, with most baritones having a bell under 9″. By contrast, euphonium bells range between 11 and 12 inches. This makes creating a clear pedal tone easier and gives the euphonium another advantage over the baritone horn on the lowest notes.

https://www.youtube.com/watch?v=yeFX0pual8I
What are the differences and similarities of a Baritone and a Euphonium?In this video I go over a practical guide to the various aspects of both instruments

https://bandmastermind.com/baritone-euphonium-difference/
Difference One: The Bore Size. With a baritone, you get a cylindrical bore meaning it will have a dark sound. With a euphonium, you get a conical bore. This means the tubing gets wider as you go from the mouthpiece to the bell causing a dark and rich tone. In my experience, the difference is barely noticeable but the euphonium is slightly louder.

https://news.paigesmusic.com/faqs/the-euphonium-vs-baritone-unraveling-the-musical-mystery/
The euphonium is the instrument that we in the States refer to with either word, while the baritone is smaller overall, has a "conical" bore rather than a cylindrical one, and produces a sound that to me feels like a marriage of a trombone and a euphonium. You'll almost never see a British baritone in an American school band room.

https://thevault.musicarts.com/whats-the-difference-between-a-baritone-and-euphonium/
A baritone has a smaller bore and bell than a euphonium, with tubing that is mostly cylindrical, meaning that the tubing is the same diameter throughout. Its sound is lighter and brighter. Baritones typically have three valves, but may have four. The baritone horn is more tightly wrapped than the euphonium and has a smaller bell.

https://faq.yamaha.com/usa/s/article/U0007381
While they may look very similar, the baritone and euphonium differ in terms of construction. Baritones are usually easier for beginners due to the cylindrical shape of the horn, aiding in tone production. Euphoniums are conical in shape, where the bore of the horn constantly gets larger throughout the horn, giving it a darker sound.

https://www.youtube.com/watch?v=xCNYwom47sE
First thing to note - I don't have a decent mic, so you can't really observe the true scale of the tonal differences between these two instruments. In this v

https://sonicfunction.com/whats-the-difference-between-a-baritone-and-euphonium/
A euphonium has a conical-bore, while the baritone has a cylindrical-bore. This difference gives the euphonium a richer, more mellow sound while the baritone has a brighter, punchier sound. Closeup of Brass Valves. You'll find that many wind and brass instruments in band or orchestra will be either conical bore or cylindrical bore.

https://www.musicarts.com/cms/student-resources/an-introduction-to-the-baritoneeuphonium
The euphonium has a conical bore (meaning it gradually gets bigger throughout the length of the instrument) and has a more mellow sound, while the baritone has a cylindrical bore (meaning it stays the same size until the bell) which gives it a brighter sound. In general, both the baritone and the euphonium play the same parts, so whichever one

https://thelessonstudio.com/about-music-lessons/blog/baritone-vs-euphonium
Because the baritone has a smaller bore, it has a much brighter and brassier sound than a euphonium. A euphonium has a larger bore, so its tone will sound darker and deeper. Also, baritones typically have three valves. Euphoniums may have three valves, but many of them will have four valves. You will also find that three-valve baritones are

https://www.askdifference.com/baritone-vs-euphonium/
The baritone is pitched in B-flat and usually has three valves, similar to a trumpet but larger. A euphonium, on the other hand, has a conical bore, producing a warmer, richer tone. It is commonly used in concert bands, brass bands, and orchestras. The euphonium is also pitched in B-flat but often features four valves, allowing for a greater

https://www.musicalexpert.org/what-is-the-difference-between-a-baritone-and-euphonium.htm
Perhaps the most notable difference between the baritone and euphonium is the size of the bore, or inside chamber of the instrument through which air passes when the player performs. The baritone has a slightly smaller bore than the euphonium does. Additionally, the shape of the tubing in a baritone is mostly cylindrical, whereas euphonium

https://www.musictoob.com/difference-between-euphonium-and-baritone-which-is-better-for-noob/
Setup. Though there's a difference in terms of the tubing configuration of these two, there's one more obvious difference - the number of valves. In general, the baritone has only three valves, while euphonium has three or four valves. The fourth valve of the euphonium helps you achieve better intonation.

https://dynamicmusicroom.com/tuba-vs-euphonium/
The tuba is the lowest brass instrument and uses valves to change its pitch. The euphonium is designed almost exactly like the tuba and generally plays an octave above. A tuba uses 18′ feet for tubing for its fundamental compared to the euphonium's 9′ feet. Look ahead for more details explained (with video too!).

https://www.reddit.com/r/euphonium/comments/t4nkgk/scoring_for_euphonium_vs_baritone/
The baritone and euphonium are saxhorns, and it is more accurate to compare them with flugelhorns and cornets than trumpets. Brass band baritones and euphoniums are pitched exactly the same, the only difference is how quickly the bore gets wider. The euphonium has a much larger presence than a baritone does.

https://www.reddit.com/r/euphonium/comments/128s3hi/is_the_difference_of_the_euphonium_and_baritone/
A better comparison would be the difference between a flugelhorn (very very conical like a euphonium) and a cornet (only slightly conical like a baritone) Reply reply EndOfTheGolden • I don't understand this. ... a baritone, and a euphonium. Reply reply Nkdude11