AKG C 451 B

AKG C451 B — Reference Small-Diaphragm Overhead Microphone

The AKG C451 B is a small-diaphragm cardioid condenser microphone engineered for professional studio and stage use, with an identical acoustic profile to its predecessor, the legendary C451 EB + CK1 capsule released in 1969. Designed for overhead drum miking, hi-hat, percussion, acoustic guitar, piano, and brass, this microphone combines a handcrafted capsule with updated surface-mount electronics. With maximum SPL tolerance of 155 dB, it remains a trusted choice for engineers needing precise transient capture on high-energy sound sources. The result is an airy, detailed overhead microphone that excels at revealing the metallic shimmer of cymbals, the snap of acoustic instruments, and the natural frequency balance of close-miked brass.

Standout Engineering of the C451 B Microphone

The handcrafted capsule is permanently fixed to the preamp rather than being user-swappable, increasing mechanical stability under live-stage vibration and road handling. A transformerless preamp paired with surface-mount technology lowers distortion, reduces weight, and improves long-term reliability. Established as a tour sound standard since the 1980s, this overhead microphone keeps performing under harsh stage conditions where lesser condensers fail.

Technical Specifications for Studio and Stage Use

These parameters define what engineers can expect when mounting this model on a boom arm for drum overheads or positioning it in front of a brass section.

• The cardioid polar pattern picks up from the top end only, focusing tightly enough to reject stage wash so drum overheads stay clear and present in the mix.
• Audio Frequency Bandwidth: 20 - 20000 Hz
• Sensitivity: 9 mV/Pa — adequate output from quiet acoustic sources
• Maximum SPL: 155 dB (with -20 dB pad engaged) — handles close-miking of brass bells and aggressive cymbal strikes without distortion
• Signal-to-Noise Ratio: 76 dB-A
• Equivalent Noise Level: 18 dB-A

On-Body Controls, Power and Build

Engineered for real recording environments, the AKG overhead microphone integrates practical switches and robust construction so engineers can adapt to changing sources without reaching for outboard gear.

• Preattenuation Pad: -10 and -20 dB selectable
• Bass Cut Filter: 75 / 150 Hz at 12 dB per octave — removes rumble and proximity buildup
• Electrical Impedance: 200 ohms with Recommended Load: 1000 ohms or higher
• Connector: Balanced 3-pin XLR (male)
• The microphone runs on standard 9 to 52 V phantom power at 2 mA, so any professional preamp in the studio or rack can feed it cleanly without a dedicated supply.
• Height: 160 mm / Diameter: 19 mm / Weight: 125 g with satin nickel-plated all-metal body for RF shielding on live stages

Who This Overhead Microphone Is Built For

This model is the right choice for studio engineers and live-sound technicians who need an accurate small-diaphragm condenser for drum overheads, hi-hat, percussion, acoustic guitar, piano, and horns. Owners of home studios will appreciate the airy sound and forgiving built-in pad, while touring engineers benefit from the road-tested all-metal construction. In church, theater, or broadcast environments where cymbal pickup must remain controlled, the cardioid pattern and switchable high-pass filter make it a reliable workhorse that can be deployed as a single overhead, mono spot mic, or as a tightly matched stereo pair.

The AKG C451 Story — Legend Continued

Released in 1969, the original C451 EB + CK1 condenser became one of the all-time great studio microphones and a tour-sound standard by the 1980s. After years of cult demand from engineers who remembered its airy character, AKG rebuilt the design with modern componentry while preserving its identical acoustical behaviour. Mix Magazine summarized the result: "an entire rethinking of the classic C-451 E/CK-1 capsule design, and it sounds better than the original." Today the C 451 B continues that lineage for a new generation of recordists.