Sennheiser MD 431 Handheld super-cardioid dynamic with on/off switch - 001605

Product Overview

The Sennheiser MD 431 is a super-cardioid dynamic handheld microphone designed for broadcast, live vocal performance, and ENG applications where a frequency-independent polar pattern and noiseless on/off switching are operationally required. The super-cardioid pattern provides a narrower acceptance angle and significantly higher gain before feedback than a standard cardioid, making the MD 431 appropriate for stages with loud monitor systems. A recessed magnetic reed on/off switch allows performers and presenters to control the microphone without audible transients, and can be locked in the on position for venues where accidental muting is a concern.

Product Description

The MD 431's super-cardioid polar pattern maintains consistent directional characteristics across the full audible frequency range—a technically demanding property that many microphones do not achieve. Many cardioid and super-cardioid designs are tighter at high frequencies and wider at low frequencies, which allows low-frequency bleed from monitor wedges to accumulate even when the mic is pointed away from them. The MD 431's frequency-independent pattern prevents this, maintaining consistent off-axis rejection at all frequencies. Internal electronics compensate for proximity effect to keep the tonal balance consistent when performers work very close to the capsule. The shock-mounted capsule mechanically isolates the transducer from handling and stand-borne vibration. A hum compensating coil rejects electromagnetic interference from stage lighting. The steel-mesh grille and robust housing are built for the demands of touring vocal applications and broadcast field use. The magnetic reed switch is recessed to reduce the risk of accidental operation and can be locked in the open position by production staff when continuous open operation is needed.

Key Features

• Super-Cardioid Dynamic Transducer — High gain before feedback for stages with loud monitor systems.
• Frequency-Independent Polar Pattern — Consistent off-axis rejection at all frequencies, including low end.
• Internal Proximity Effect Compensation — Natural tonal balance at close working distances.
• Recessed Magnetic Reed On/Off Switch — Silent switching; lockable in the on position.
• Shock-Mounted Capsule — Mechanical isolation from handling and stand vibration.
• Hum Compensating Coil — Rejects EMI from stage lighting and power equipment.
• Steel-Mesh Grille and Rugged Housing — Built for touring and broadcast field production.

Typical Applications

• Auditorium
• House of worship
• Broadcast studio
• Recording studio

Technical Specifications

Frequently Asked Questions

Q: What is the practical advantage of a frequency-independent polar pattern?

Most microphones exhibit a tighter polar pattern at high frequencies and a wider one at low frequencies. This means low-frequency sound from monitors positioned at the sides can bleed into the signal even when the mic is pointed away from them. A frequency-independent pattern maintains consistent directional rejection across all frequencies, which prevents low-frequency monitor bleed from building up during a live performance.

Q: Can the on/off switch be locked to prevent accidental muting?

Yes. The recessed magnetic reed switch can be locked in the on position, preventing performers from accidentally muting the microphone mid-performance. Production staff can set the lock position before the performance begins. The lock does not interfere with the switch function when in the unlocked position.

Q: How does the MD 431 compare to the MD 435 for live vocal use?

The MD 431 uses a super-cardioid pattern for higher gain before feedback, while the MD 435 uses a cardioid pattern with a wider acceptance angle. The MD 431 is the better choice for stages with loud monitors or environments where feedback control is the primary concern. The MD 435 is better suited to performers who move substantially relative to the mic axis.

Q: Is the MD 431 appropriate for broadcast handheld use?

Yes. The frequency-independent pattern, noiseless on/off switch, and low handling noise make it appropriate for broadcast handheld interview and ENG applications. The recessed switch reduces the risk of accidental operation during field use.