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  • AEAKU4

    AEA KU4 Ribbon Microphone

    This ribbon mic is all class. Smooth sounding with less proximity effect this ribbon microphone is well suited to vocals, guitars and brass. The KU4 is unmistakably a ribbon microphone, with a characteristically smooth ribbon sound. Like other ribbons, its lightly-tensioned, ultra low mass ribbon has a frequency response beyond 20 kHz, an accurate transient response, and no upper midrange resonances common to large condenser mics. 


        However, having a supercardioid instead of a figure-eight polar response pattern mics sets it apart from other ribbon mics. The KU4's suppressed rear lobe reduces the pickup of room ambience and is especially useful when the rear of a figure-eight pattern would pick up undesirable sounds. The KU4's reduced bass proximity effect facilitates closer micing while its low-tuned ribbon will not exhibit bass distortion. These characteristics make the KU4 well-suited for modern studio production.

        The Legacy of the RCA KU3A

        The KU4 is a re-envisioning of the legendary RCA KU3A, a unidirectional microphone originally designed for the Hollywood movie studios. It combined the smooth ribbon sound of a 44 with a unidirectional pattern, wide sweet spot and reduced bass proximity effect. It became a standard at film studios around the world because it expanded an engineer's range of placement choices. Today, however, the KU3A is a collector's item, and few studios or rental houses own them. AEA is proud to put this microphone back into the hands of modern users. 

        The KU4 is your ticket to discovering why RCA unidirectional ribbon microphones have been used in professional studios 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. 

        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): -12Angle of Maximum Rejection: 135°

        Transducer element
        Ribbon Thickness: 1.8 microns ( .0000018 meter ) of pure aluminumRibbon Width: 0.082” (2.1 mm)
        Ribbon Length: 1.25” (28.6 mm)

        Included: Custom storage/shipping case, stand adapter, manual and

        attached 1.5 meter microphone cableLimited Warranty:

        Three years parts and labor, shipping not included. 


    Need more info? Click HERE for the manufacturer's website >>>