What microphone can I use that DOESN'T cause feedback?
Neumann M 150 Tube Microphone
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Amazon.com: AxcessAbles Dynamic Wired Handheld Microphone with 10ft Mic Cable, On/Off Switch, and a Carry Pouch | Dynamic Singing Microphone | DJ Mic| Mic for Singers |AxcessAbles MC-20 : Musical Instruments