- Shure’s Article on Accordion Micing https://www.shure.com/en-US/performance-production/louder/eight-ways-to-mic-an-accordion
- Neumann Article: https://www.neumann.com/homestudio/en/what-is-impedance
- AEA Article: https://www.aearibbonmics.com/how-impedance-affects-ribbon-microphones/