Wikipedia
Copperphone
The Copperphone is a hand crafted specialty microphone designed and built by The Polyphonic Spree bassist Mark Pirro. It uses components from vintage communications equipment as well as a mechanical filtering device to achieve a limited bandwidth frequency response similar to that of AM radio and the nostalgic sound of the early recordings. The Copperphone is manufactured by Pirro and distributed through his company Placid Audio. Placid Audio microphones have been used by many artists including Green Day, Queens of the Stone Age, Lou Barlow, Rush, Norah Jones, Jack White, St. Vincent, The Bright Light Social Hour, as well as Grammy Winning producer Jacquire King