Audix ADX51
The Audix ADX51 is a professional pre-polarized electret condenser microphone built for stage, studio, and broadcast use. Designed to deliver a smooth, accurate frequency response, the ADX51 offers the flexibility to handle both close and distance miking across a wide range of acoustic instruments. Whether it's tracking in a controlled studio environment or capturing a live performance on stage, the ADX51 is engineered to reproduce the natural character of an instrument with clarity and precision. Every unit is designed, assembled, and tested by Audix in the USA, reflecting the brand's commitment to quality control and consistent performance from microphone to microphone.

Accurate, Flexible Sound Capture
At the heart of the ADX51 is a uniformly controlled cardioid polar pattern, which allows the microphone to focus in on the instrument being miked while isolating it from other sound sources nearby — a crucial feature for busy stages or multi-instrument studio sessions. The ADX51 covers a wide frequency range of 40 Hz to 18 kHz, giving it the reach to capture both the low-end body and the upper-frequency detail of acoustic instruments. Central to this performance is a 14 mm gold vapor diaphragm, which contributes to the microphone's smooth and accurate tonal reproduction across that frequency range.
Built-In Tone Shaping Controls
The ADX51 includes onboard switches for a -10 dB pad and a bass roll-off filter set at 150 Hz. The pad allows the microphone to handle louder sound sources without distortion, while the bass roll-off filter helps reduce unwanted low-frequency buildup, such as stage rumble or proximity effect, without needing external EQ. These switchable controls give engineers and performers practical, real-time flexibility to adapt the microphone to different instruments and environments, making the ADX51 a versatile tool across a wide variety of miking applications.
Rugged Construction and Craftsmanship
Beyond its acoustic performance, the ADX51 is built to last. It features a precision-machined brass body paired with a durable black E-coat finish, giving it resistance to wear from regular touring or studio use. A steel mesh grill protects the internal capsule components, and a gold-plated XLR connector ensures a reliable, corrosion-resistant connection. The ADX51 is also easy to position, making it convenient for engineers to dial in the exact placement needed for a given instrument. Backed by Audix's 3-year warranty on Fusion Series and condenser microphones, the ADX51 is manufactured to high standards and tight tolerances — a mic that's designed to hold up through repeated use in demanding stage and studio settings while consistently delivering clear, accurate sound.
Why We Love This
Our gear experts appreciate the ADX51 for its accurate, natural sound reproduction across a wide 40 Hz–18 kHz frequency range, making it versatile for many acoustic instruments. Its cardioid pattern isolates the instrument being miked from surrounding stage noise, which matters in live multi-instrument settings. The onboard -10 dB pad and 150 Hz bass roll-off give performers on-the-fly tone control without extra gear. Its rugged brass build and easy positioning also make it dependable for touring musicians.
Features:
- Premium electret condenser microphone
- Smooth, accurate frequency response
- Wide frequency range: 40 Hz – 18 kHz
- 14 mm gold vapor diaphragm
- Uniformly controlled cardioid polar pattern
- Switchable -10 dB pad
- Bass roll-off filter at 150 Hz
- Precision-machined brass body with durable black E-coat finish
- Steel mesh grill for capsule protection
- Gold-plated XLR connector