Sennheiser MD 421-II Cardioid dynamic with five position bass rolloff switch. Includes MZA421 lock-on stand adapter - 000984

Product Overview

The Sennheiser MD 421-II is a large-diaphragm cardioid dynamic microphone with a five-position bass roll-off switch that has been in continuous production for over 35 years—one of the most widely used dynamic microphones in broadcast and recording studios worldwide. It delivers reliable performance on a broad range of sources including drum toms, guitar amplifiers, bass cabinets, brass instruments, and broadcast voice, with the five-position switch providing on-mic low-frequency management that replaces the need for console EQ in many applications. The kit includes the MZA421 lock-on stand adapter.

Product Description

The MD 421-II uses a large-diaphragm dynamic transducer in a full-bodied cardioid polar pattern that handles high sound pressure levels from drums, amplifiers, and brass without distortion—no phantom power required. The five-position bass roll-off switch provides five levels of progressively increasing high-pass filtering, allowing engineers to compensate for proximity effect at close working distances or tighten the low-end response of instruments with strong fundamental energy below 100 Hz. In broadcast voice applications, the roll-off manages the typical proximity effect of a close-miked announcer, reducing the need for console EQ during a live broadcast. The well-controlled cardioid polar pattern provides effective off-axis rejection that reduces bleed from adjacent sources in multi-mic setups—essential on drum kits where the snare mic must reject the tom and vice versa. The MZA421 lock-on stand adapter uses a positive locking mechanism that prevents the microphone from accidentally being pulled from the stand during repositioning, which is a common practical problem with friction-fit adapters on busy sets and sessions. The rugged metal housing has been refined in the II revision for improved reliability while preserving the acoustic characteristics that made the original MD 421 a studio standard.

Key Features

• Large-Diaphragm Dynamic Transducer — Handles high SPL from drums, amplifiers, and brass without distortion.
• Five-Position Bass Roll-Off Switch — On-mic low-end management for proximity effect and source control.
• Cardioid Polar Pattern — Effective off-axis rejection for isolation in multi-mic configurations.
• No Phantom Power Required — Passive dynamic for simplified patching in any setup.
• MZA421 Lock-On Stand Adapter — Positive locking prevents accidental removal during sessions and live use.
• Rugged Metal Construction — More than 35 years in continuous production confirms long-term durability.
• Broadcast and Studio Proven — Industry standard for toms, guitar cabinets, broadcast voice, and brass.

Typical Applications

• Broadcast studio
• Recording studio
• Auditorium

Technical Specifications

Frequently Asked Questions

Q: What does each position on the five-position bass roll-off switch do?

The five positions provide progressively increasing high-pass filtering from flat (position 1) through mild, moderate, and strong roll-off (positions 2–5). This allows the engineer to set the appropriate low-frequency cutoff at the microphone itself, which is particularly useful for managing proximity effect at close working distances or removing low-frequency rumble from instrument sources with heavy fundamental content.

Q: Why is the MD 421-II considered a broadcast voice standard?

The MD 421 has been deployed in broadcast studios worldwide since the 1960s. Its large-diaphragm dynamic design handles the SPL of close-miked voice work, the five-position roll-off manages proximity effect, and the cardioid pattern rejects room ambience and adjacent sources. Dynamic microphones also reject electromagnetic interference from monitors and computer equipment in broadcast studios better than condenser designs in some configurations.

Q: Why does the stand adapter lock on?

Standard friction-fit mic clips can be pulled off the stand when the cable is moved or when the engineer grabs the microphone during a session. The MZA421 uses a positive locking mechanism that requires a deliberate action to release, preventing the microphone from being accidentally knocked off the stand during a recording session or live production.

Q: Is the MD 421-II suitable for guitar amplifier recording?

Yes. Close-miked guitar amplifiers are one of the MD 421-II's most common recording applications alongside drum toms. The large-diaphragm dynamic handles high SPL cleanly and captures the harmonic content of amplified guitar with a full-bodied response that complements the close character of the source.