48-month financing on our best brands
October Savings | New Ways To Save For Fall 2021
$ 4,999 .00
or $139/month for 36 months 0% interest for 36 months. 36 equal monthly payments required. Learn more
Ships directly from AEA
Note: This item may not be returnable or could require a restocking fee. Contact one of our Audio Consultants for more details. This item ships directly to you from the manufacturer. To ensure that the manufacturer currently has stock, please chat, call or email for the latest availability status.

SKU

16365

AEA KU4 Ribbon Microphone

Unidirectional ribbon microphone based on the classic RCA KU3A
MFR# KU4

Product Description

The AEA KU4 celebrates the legendary RCA unidirectional KU3A, a high sensitivity microphone designed for the Hollywood movie studios.   Also known as a M-10001 for its manufacturing number, it was RCA’s most expensive ribbon microphone.  Fewer than 600 were ever manufactured.

What made the KU3A special?  It combined the smooth ribbon sound of a 44 with a unidirectional pattern, a wide sweet spot and less proximity bass boost.  It expanded an engineer’s range of placement choices and became a standard at film studios around the world.

Although condenser mics became the new standard by the end of the 1960s, ribbon mics are still appreciated today by experienced music recording engineers. However the KU3A is a rare microphone, a collector’s item, and few studios or rental houses own them.  Opportunities to work with a good KU3A are limited.

We are proud to expand your opportunities with the AEA KU4 featuring an RCA ribbon, interchangeable KU3A parts and consistent performance.

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

How is the KU4 different from other ribbon microphones?
The KU4’s suppressed rear lobe is useful when the back of a figure-of-eight would pick up undesirable sounds.  The KU4’s reduced proximity bass boost facilitates closer micing and its low-tuned ribbon delivers solid, undistorted bass.  These characteristics make the KU4 well suited for modern studio production.

Its lightly-tensioned, ultra low mass ribbon has a frequency response out to 40 kHz and fast, accurate transients.  There is no upper midrange ringing common to large condenser mics.  The KU4’s ribbon is well protected and its field-tech replaceable pole piece and ribbon assembly is a real convenience if an accident occurs.

The KU4 is your ticket to discovering why the KU3A has been part of high-end studio life for over 60 years.  AEA is honored to play a part in its history, and invites you to listen to the KU4 and claim your part of this legacy.

Specifications

  • Operating Principle: Velocity microphone
    • Frequency Response: Below 30 Hz to above 20 kHz
    • Maximum SPL: 140 + dB SPL above 200Hz for 1% third harmonic
    • Output Sensitivity: 2.8 mV/Pa into unloaded circuit
    • Output Impedance: 300 Ω nominal
    • Recommended Load: 1.2 KΩ or greater
    • Phantom power: Not required or recommended
    • Polarity: Pin 2 high for positive pressure at the front of the microphone.
    • Connector: XLR-3M wired to a 1.5 meter captive cable
  • Off Axis Response
    • Polar Pattern: Supercardioid
    • Relative Output at 180° (dB): -12
    • Angle of Maximum Rejection: 135°
  • Transducer element
    • Ribbon Thickness: 1.8 microns ( .0000018 meter ) of pure aluminum
    • Ribbon Width: 0.082” (2.1 mm)
    • Ribbon Length: 1.25” (28.6 mm)
  • Accessories
    • Included: Custom storage/shipping case, stand adapter, manual and
    • attached 1.5 meter microphone cable
  • Limited Warranty
    • Three years parts and labor, shipping not included.

Product Specifications

ConditionNew
Package ContentsCase, stand adapter, mic cable
Length12.7 in
Diameter3.8 in
Unit Weight7 lb
Tube or Solid StateSolid State
Transducer TypeRibbon
Polar PatternSuper-Cardioid
Number of MicrophonesSingle Microphone
ImpedanceNominal: 300 Ohms
Frequency Range30 Hz - 20 kHz
Sensitivity-51 dBV/Pa (2.8 mV) into unloaded circuit
Max. SPL140+ dB (1% third harmonic > 1 kHz)

Product Reviews

No one has written a review yet. Be the first!

* Required Fields

Share Your Opinion

The best gear advice always comes from those who use it the most. That's where you come in! Let the pro audio world hear your voice with a review of the AEA KU4 Ribbon Microphone . Once you submit your review, please check your email and verify your address to have it posted.

How do you rate this product?
I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.
The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
James P.
Thank you so much! Vintage King has been so fair and easy to work with. I can't thank you enough. It feels good to trust such a hefty purchase to folks who are so helpful and knowledgeable. Vintage King is a sound designers dream store.
Noa L.
You guys have excellent customer service and I am excited about the next upgrade I complete on my fifth recording facility. I've been in the studio business for forty plus years. The salesman I worked with at Vintage King was the best of the best. You all rock!
Robby T.
I would recommend Vintage King to any one looking for top-class gear, unbeatable customer service and the best prices on the map!
Jake D.
My experience with Vintage King was excellent. The order was here fast considering it was out of stock. The sales person had SKB send it to me directly and I couldn't have been more pleased.
Michael D.
From the minute I placed my order I was kept well-informed through each step in your process. Even though I was buying a comparatively modest piece of gear, your attention to detail made me feel like I was purchasing a six-figure mixing desk.
Thomas W.
I am a new customer of yours. You guys provided me the absolute best deals in ordering all the equipment to power my brand new recording studio. Your customer service is amazing and i will always deal with you from here on out.
Rob M.
Thanks for your great service and getting this out today. You guys really are the Kings!
Alan B.
Better than expected! Truly impeccable service. Your team was professional, knowledgeable, provided speedy delivery above and beyond standard. Vintage King Audio is definitely my go to for all of my audio and information needs.
James O.