What is a Compensating Brass Instrument?

The term compensating is one that is often referred to but not always fully understood. It is normally used with reference to lower brass instruments (eg. Euphoniums & Tubas) which are either 'compensating' or 'non-compensating' models. There is a common misconception that if an instrument has a 4th valve* it is compensating, but that is not necessarily the case. I'll try to explain exactly what it means as clearly and concisely as possible, although that's easier said than done!
The term compensating is one that is often referred to but not always fully understood. It is normally used with reference to lower brass instruments

What is a Compensating Brass Instrument?

Immaculate compensating euphonium For Fascinating Sound Notes

XO 1270L Professional Compensating Euphonium - Clear Lacquer

Paxman - Professional Model 33 Bb/F (A-+) Compensating Double

Cambridge Classic 4/4 BBb Compensating Tuba - Euphoniums, baritone

John Packer JP273S Compensating Baritone Silver

BAR905 Non Compensating Euphonium — RS Berkeley Musical Instruments

Find many great new & used options and get the best deals for Professional Brushed Brass Compensating System Euphonium Horn B-Flat Wheels Case at the

Professional Brushed Brass Compensating System Euphonium Horn B-Flat Wheels Case

Normans Musical Instruments Blog – Tagged Technical Guides

Saw this on , compensating 4th valve? : r/trumpet

Jupiter 3+1 Valve Professional Compensating Euphonium - Silver-Plated

Willson 2900-TA-1 Compensating Euphonium

Find many great new & used options and get the best deals for Professional Brushed Brass Compensating System Euphonium Horn B-Flat Wheels Case at the

Professional Brushed Brass Compensating System Euphonium Horn B-Flat Wheels Case