Shure GLX-D24R+B87A Wireless Digital Handheld Mic System w/Beta87A Mic Upright Pianos while the 640 has a

while the 640 has a medium-large bore for versatility in all musical genres

compatible design MiniLAB 3 is built to fit seamlessly into any setup

Contains all of the technical work required for comprehensive AMEB Tuba examinations

All-metal microphone body

Convenient exterior pocket with built-in organizer and shoulder strap

Shure GLX-D24R+B87A Wireless Digital Handheld Mic System w/Beta87A Mic Upright Pianos while the 640 has aGLX D+ Dual Band Digital Wireless is the perfect solution for musicians and presenters who want to go wireless with confidence, and without complexity. With new Dual Band Wireless Technology, GLX D+ can operate in both 2. 4 and 5. 8GHz, more than doubling the available bandwidth while also intelligently avoiding interference for reliable, dropout free audio. Shure Wireless Digital Handheld System GLXD2+; Beta87A Mic; GLXD4R+ Dual Band 2. 4GHz and 5.