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Quotes from the pros

"I record guitar amps nearly every day and I choose the AMI / Fathead over all of the other ribbon mics in my locker. They give me incredible creamy highs, punchy lows and a killer tight midrange that I demand."

David Percefull
Owner of Yellow DOG Studios, Austin, Texas

" I got a chance to do some recording recently at Yellow Dog Studio's in Austin, TX, for a shoot-out we were doing between different brands of guitar amp transformers. We needed a sensitive mic to hear the subtle differences, and it was suggested we try out the new AMI/Fat Head -- what a great mic!!! The AMI/Fat Head is true-sounding with a great sense of space. It made it easy to hear the differences in what we were listening to. I immediately ordered one after the session."

Lee Jackson
Guitarist, Guitar Amplifier & Effects Designer, Mastering Engineer Austin, Texas

Read Review from Everything Recording

Assembled in the USA

The Knuckle Head is a passive ribbon microphone that combines the acoustic components of the successful Fat Head ribbon with a shockmounted headbasket design reminiscent of early broadcast microphones.

The ribbon motor uses Neodymium magnets surrounding a 2.2-micron corrugated aluminum ribbon measuring 5mm x 45mm. The ribbon is mounted symmetrically within the magnetic gap, *the front and back of the mic will produce the same sound.

The ribbon motor and headbasket are suspended within a 6-inch diameter metal hoop by eight springs. The output transformer is located within the cylindrical shaft below the shockmount hoop.

* When phase is reversed

  • Type: Ribbon (velocity) Microphone
  • Ribbon type & Dimensions: 99% Pure aluminum, 2.2 micron, 1 3/4" (L) X 3/16" (W)
  • Polar pattern: Figure 8 Symmetrical design
  • Sensitivity: -56 db +/- 2 dB (0 dB=1V/Pa)
  • Frequency response: Coming soon
  • Output Impedance: <=200 Ohms
  • Recommended load impedance: >1000 Ohms
  • Max.SPL (1% THD @1000 Hz): 135 dB
  • Connector: 3-Pin male XLR
  • Size: Diameter: O.D. grill:3", O.D. ring:6", O.D. body:1", Overall length:10"


  • KNUCKLE HEAD ribbon microphone
  • Aluminum case
  • Premium adjustable mounting clip
  • Micro-fiber cleaning cloth
  • Specifications and typical measurement report
Limited Edition $349.00