The AEA KU4 is a classic side-address ribbon microphone designed for modern studio work where focus, depth, and musicality matter. Inspired by the legendary RCA KU3A, the KU4 delivers the rich, natural character ribbon microphones are known for, while offering greater control in real-world recording environments. Its supercardioid pickup pattern helps reduce room reflections and unwanted bleed, making it especially comfortable to use in studios with less-than-perfect acoustics or in sessions where isolation is important. Sonically, the KU4 is smooth, full-bodied, and detailed without sounding harsh or overly polished. It handles close placement with ease, offering a balanced low end and clear presence that flatters vocals, brass, low strings, and a wide range of acoustic instruments. Handcrafted in the USA with the care and attention AEA is known for, the KU4 blends vintage ribbon tone with practical, modern performance—making it a dependable choice for engineers and artists seeking an expressive, natural sound that sits effortlessly in a mix.