Sound Pure's Take
The AKG C451 E is a benchmark small-diaphragm FET condenser and a fundamental building block of vintage modular mic design. As an integral component of AKG's original Condenser Modular System (CMS), the C451 E body provides a discrete, transformer-coupled foundation that delivers blistering transient speed, sparkling high-frequency extension, and remarkable analog depth.
Unlike its sister model, the C451 EB (which incorporated a built-in bass roll-off switch on the body), the C451 E features a straight, uninterrupted preamplifier path. This design relies on inline modular accessories (such as the A51 pad or H51 filter) inserted between the body and capsule. When paired with the iconic CK1 cardioid capsule, the C451 E offers an exceptionally fast, articulate sound that defines classic acoustic guitar, piano, and drum overhead recordings.
From AKG Microphones
The AKG C451 E is a professional modular small-diaphragm FET condenser microphone system engineered for high-precision studio recording and critical broadcast applications. Introduced as a foundational element of AKG’s pioneering Condenser Modular System (CMS), the C451 E preamplifier body provides a pristine, transformer-coupled output stage designed to mate seamlessly with AKG's interchangeable "CK" series capsules.
Built to deliver ultra-fast transient response, wide dynamic range, and extremely low self-noise, the C451 E system captures acoustic instruments, percussion, and delicate ambient sources with exceptional clarity and high-frequency extension. Its modular architecture allows engineers to swap capsule polar patterns in seconds or insert inline attenuator pads and high-pass filters directly into the signal path. Encased in a heavy-duty nickel-plated brass body, the C451 E remains a legendary reference tool for transient accuracy and transparency.
Key Features
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Modular CMS System Architecture: Standardized screw-thread design enables instant pairing with various interchangeable AKG CK capsules (including the CK1 cardioid, CK2 omni, CK3 hypercardioid, and CK8/9 shotguns).
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Discrete Transformer-Coupled Output: Custom transformer-balanced output circuitry provides rich analog body, excellent rejection of RF interference, and massive dynamic headroom.
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Ultra-Fast Transient Capture: Engineered to react instantaneously to rapid attacks, making it ideal for drum overheads, hi-hats, acoustic guitars, and grand pianos.
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Inline Modular Expansion: Compatible with AKG inline accessories, including switchable attenuation pads (A51) and low-cut filters (H51), inserted directly between the preamp body and the capsule.
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Rugged All-Metal Construction: Heavy-duty nickel-plated brass body designed for long-term reliability under grueling studio and touring environments.
- Type
- Modular Small-Diaphragm FET Condenser Preamplifier Body
- Capsule System
- AKG CMS Series (CK1, CK2, CK3, CK5, CK8, CK9 compatible)
- Frequency Response
- $20\text{ Hz to } 20,000\text{ Hz}$ (capsule dependent)
- Output Impedance
- $\le 200\ \Omega$ (balanced)
- Recommended Load Impedance
- $\ge 500\ \Omega$
- Maximum SPL
- $138\text{ dB SPL}$ at $0.5\%$ THD (with CK1 capsule)
- Equivalent Noise Level
- $18\text{ dB-A}$ (with CK1 capsule)
- Power Requirements
- $48\text{V}$ Phantom Power (DIN 45596) or dedicated power supply
- Connector
- 3-pin XLR male
- Finish
- Satin Nickel-Plated Brass
- Dimensions
- $145\text{ mm}$ length $\times 19\text{ mm}$ diameter ($5.7" \times 0.75"$)
- Weight
- $115\text{ g}$ ($4.05\text{ oz}$)
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