Unidirectional Ribbon Mic Constructed from Authentic New Old Stock RCA Ribbon Material
Write review Item ID: KU4
AEA KU4 image 1
AEA KU4 image 1
Sweetwater Savings: $484.00 MSRP: $4,840.00
Special Financing - Ends Jul 6

Or just $121/month§ for 36 months

0% interest for 36 months**. 36 equal monthly payments required. Valid through 7/6/2017. Learn more

Special Order
Special-ordered from AEA and usually arrives to you within 1-2 weeks. Please note: special orders cannot be canceled or returned.
Note: While most of the items we sell ship for free, this item does not qualify for free shipping due to special circumstances.

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Special Order

An Updated Version of a Classic!

Made from authentic new old stock RCA materials, the AEA KU4 is a modern revival of the legendary RCA unidirectional KU3A. This high-sensitivity ribbon microphone was originally designed for top-end Hollywood movie studios. Fewer than 600 KU3As were ever made, and those few engineers who were lucky enough to use them simply raved about their smooth sound, wide sweet spot, and minimal proximity effect. Now, the KU4 lets you experience this amazing mic in your own studio!

AEA KU4 Unidirectional Ribbon Mic Features:
  • Contemporary realization of the RCA KU3A classic
  • Supercardioid pattern for excellent rear rejection
  • Reduced proximity effect
  • Smooth, high-bandwidth frequency response
  • Authentic New Old Stock RCA ribbon material
  • High-quality anodized & nickel-plated finish
  • Custom AEA transformer, neodymium magnets
  • Consistent Quality
  • Field-tech replaceable ribbon assembly
  • Hand-crafted in Pasadena, California

What Does "Special Order" Mean?

A special-order product is one that we don't normally keep in stock. We order it from the manufacturer as soon as you order from us. We have great relationships with all the manufacturers we carry, so we can get your special order to you as fast as or faster than anyone else. Remember that special orders are non-returnable and non-cancelable, so make sure the item is right for you. A Sweetwater Sales Engineer can help you decide — call (800) 222-4700 for assistance!

Additional Media

Studio Microphone Buying Guide

Tech Specs

Microphone Type Ribbon
Ribbon Type 1.8-micron Aluminum (2.1mm x 28.6mm)
Polar Pattern Supercardioid
Frequency Response 30Hz-20kHz
Max SPL 140dB
Output Impedance 300 ohms
Connector XLR
Weight 4.7 lbs.
Included Accessories Stand Adapter, Case
Manufacturer Part Number KU4

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See also: Ribbon Mics, AEA, AEA Ribbon Microphones