Geyer style horn with medium-large throat for moderate resistance to air flow.

• Hand-lapped rotary valves and slides
• Rotary valves and slides that have been hand-lapped are airtight and have smooth action.
• 
   
• Articulated key levers
• Articulated key levers have responsive motion.
• 
   
• Hammered and annealed bell
• Hammering and annealing are processes so important to the instrument\'s acoustic characteristics that Yamaha employs computer-controlled equipment to ensure consistently superior sound. Hammering enables bells to have a rich, resonant tone that blends beautifully with other instruments. Annealing is a cooling and heating process that makes it easier to control the acoustics of the instrument.
• 
   
• Cyclical bore
• A cyclical bore is a perfectly cylindrical tubing assembly in combination with a conical leadpipe and bell system. This allows for consistent air flow throughout the horn.
• 
   
• Tapered valves
• Tapered valves wear for a long time without air leakage.
• Excellent sound in all registers
• The combination of the secure high register, strong projection, and quick attack of the Bb horn with the rich, warm timbre of the F horn make the double horn ideal for most playing situations.
• 
   
• Warm, clear sound
• 
   
• Great tone color flexibility with rich, focused core
• 
   
• Excellent projection in any venue
• 
   
• Accurate intonation
• 
   
• Comfortable, quick response
• 
   
• Available feature
• The YHR-667 horn is available with a detachable bell (YHR-667D).