LOW IMPEDANCE To connect the 520DX to a low impedance device, such as a mixer, use a low-to-high impedance-matching line transformer, such as the Shure model A95U. Review Shure 520DX The blues harp harmonica player's weapon of choice for decades, Shure's sturdy Green Bullet is the microphone you'll want to cup in your hands and wail into. As far as the green bullet mics, Shure used at least four different models of elements in them, not counting the current model now being used in the 520DX which I believe is model 90A4482. This microphone, according to Shure, is based on the old 520 we all know and love. Will be shipped insured and well packed. Overview - Contoured to fit comfortably in the palm of your hand, the Model 520DX "Green Bullet" microphone produces the unique sound that has made it a legend among harmonica players. NOTE: The 520DX can be rewired for low impedance, but this disables the volume control. ♦️Shure 520DX With signature green and chrome die-cast casing, the "Green Bullet" is the definitive blues harp voice ♦️Guaranteed Best Price ♦️One Stop Solution for Audio, Visual and PA System 100Hz  to 5kHz. To connect the 520DX to a low impedance device, such as a mixer, use a low-to-high impedance-matching line transformer, such as the Shure model A95U. Contact the Shure Applications Group at (847) 600-8440 for more information. NOTE: The 520DX can be rewired for low impedance, but this disables the volume control. Contact the Shure Applications Group at (847) 600-8440 for more information. Has its own volume potmeter. SPECIFICATIONS Type Dynamic Based on older crystal models, this is a dynamic microphone made for bluesharp. Compare prices and shop new and used Shure 520DX Microphones on Reverb. High impedance output for connecting to a guitaramp. In 1996, Shure began production of the newest version of the green bullet which is now the model 520DX. The mic now came with a built in volume control in the stand hole, and a whole new element. Contoured to fit comfortably in the palm of your hand, the Model 520DX "Green Bullet" microphone produces the unique sound that has made it a legend among harmonica players.The 520DX features a volume control knob at the base of the microphone that allows musicians to make adjustments to suit their needs during a live performance. Works perfectly. Buy Shure 520DX Green Bullet Harmonica Microphone featuring Classic Blues Harp Microphone, Fits Between Harp & Hands, Rugged, Dynamic Design, Requires No Power, Omnidirectional Pattern, Supplied with 1/4" Connector, Volume Control Knob. The Shure 520DX is the most up-to-date iteration of the company's green bullet harmonica mic.