C 451 B
Studio Cardioid Condenser Microphone Description
The C 451 B is the latest model in the C 451 series that dates back to 1969. It is a cardioid only design with a permanently fixed capsule (a departure from the previous modular system). The acoustics of the original cardioid capsule, CK 1, are modeled and matched in the current version, producing the unique overall rising frequency characteristics. The rise is no more than 3 dB and is broadly centered around 12 kHz. Its transformerless preamp uses surface mount technology and, therefore is lighter, yet more rugged than its predecessor. Switchable 10 and 20 dB pads are now integrated. Maximum sound pressure levels in the range of 155 dB (in the 20 dB sensitivity position) can be attained with no greater than 0.5% distortion. A selectable low frequency, or bass roll-off option, provides 12 dB per octave attenuation below 75 or 150 Hz. The C 451 B, like its predecessor, is most commonly used in studio and tour sound applications such as micing choirs, drums, percussion and acoustic guitars. It is available as a single piece or in computer matched stereo pairs, and operates on all phantom voltages between 9 and 52 volts. The SA 40 stand adapter and W 90 windscreen are included as standard accessories.

Specifications

Transducer type: Frequency response: Sensitivity at 1 kHz: Self noise level: Dynamic range: Polar pattern: Impedance: Load impedance: Switchable pad: condenser 20 Hz to 20 kHz 9 mV/Pa (-41 dBV) 18 dB-A 117 dB cardioid 200 ohms >1000 ohms -10 and 20 dB

Features

Ultra-smooth response with slight rising on-axis frequency characteristic High front-to-back rejection ratio Transformerless output for low distortion at high operating levels 10 and 20 dB pad Switchable 12-dB roll-off at 75 or 150 Hz
Sound pressure level for 0.5% THD: 135 dB SPL (unpadded) 145 dB SPL (-10 dB pad) 155 dB SPL (-20 dB pad) LF roll-off: Power requirement: Output connector: Finish: Size: Net/shipping weight: Included accessories: 12 dB/octave at 75 and 150 Hz Phantom powering, 9 to 52 Vdc 3-pin XLR-M Satin nickel.75 inches diameter (19 mm) 6.3 inches length (160 mm) 4.4 oz. (125 g)/1.7 lbs. (760 g) SA 40 stand adapter W 90 foam windscreen padded carrying case H 50 stereo bar (stereo pair only)
Architects and Engineers Specifications
The microphone shall have a cardioid pattern. The microphones sensitivity shall be no less than 9 mV/Pa. At an operating level of 135 dB SPL the microphones total harmonic distortion shall be no greater than 0.5%. The microphones self noise level shall be no higher than 18 dB-A. Output padding switchable at 10 and 20 dB shall be integral to the microphone. Low frequency attenuation at 12 dB/octave commencing at either 150 or 75 Hz shall be integral to the microphone. The microphone shall operate with phantom power over the range from 9 Vdc to 52 Vdc. The diameter of the microphone shall be no greater than.75 inches (19 mm), and the body length shall be no longer than 6.3 inches (160 mm). The net weight of the microphone shall be no greater than 4.4 ounces (125 g). The microphone shall be the AKG Acoustics Model C 451 B.

Graphical Data

AKG is constantly improving and modifying its products, therefore, specifications are subject to change without notice.

0 -10 -20

.75 (19 mm)

lin 75Hz 150Hz

6.3 (160 mm)

Limited Warranty

Valid only in the United States. AKG Acoustics warrants AKG products against defects in material or workmanship for a period of two years from the date of original purchase for use, and agrees to repair or, at our option, replace any defective unit without charge for either parts or labor. Important: This warranty does not cover damage resulting from accident, misuse or abuse, lack of reasonable care, the affixing of any attachment not provided with the product, loss of parts or connecting the product to any but the specified receptacles. This warranty is void unless service or repairs are performed by an authorized service center. No responsibility is assumed for any special, incidental
or consequential damages. However, the limitation of any right or remedy shall not be effective where such is prohibited or restricted by law. Simply take or ship your AKG product prepaid to our service department. Be sure to include your sales slip as proof of purchase date. (We will not repair transit damage under the no-charge terms of this warranty.) Note: No other warranty, written or oral is authorized by AKG Acoustics, Inc. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Some states do not allow the exclusion or limitation of incidental or consequential damages or limitation on how long an implied warranty lasts, so the above exclusions and limitation may not apply to you.

Microphones Headphones Wireless Microphones Wireless Headphones Headsets Electroacoustical Components
AKG Acoustics GmbH Lembckgasse 2125, P.O.B. 158, A-1230 Vienna/AUSTRIA Tel: (43 1) 86 654-0*, Fax: (43 1) 86 654-516 Internet: http://www.akg.com AKG Acoustics; A Division of Harman Pro Germany Bodenseestrae 228, D-81243 Mnchen/GERMANY Tel: (089) 87 16-0, Fax: (089) 87 16-200 Arbiter Pro Audio Wilberforce Road, London NW9 6AX/ENGLAND Tel: (0181) 202 1199, Fax: (0181) Specifications subject to change without notice. AKG ACOUSTICS, U.S. 914 Airpark Center Drive Nashville, TN 37217, U.S.A. Tel: (615) 620-3800, Fax: (615) 620-3875 Studer Japan Ltd. 2-43-7, Uehara, Shibuya-ku, Tokyo 151-0064/JAPAN Tel: (813) 3465-2211, Fax: (813) 3465-2214 Erikson Pro Audio 620 McCaffrey, St-Laurent, Quebec, H4T 1N1, CANADA Tel: (514) 738-3000, Fax: (514) 737-5069 Internet: www.jam-ind.com/eriksonpro

DS-C 451 B

AKG.STUDIO.PRECISION
PRECISE ARTISTIC WORK DESERVES PRECISE ARTISTIC CRAFTSMANSHIP.
C 451B It was Worth Waiting for.
Identical acoustics of the legendary CK 1. Rugged construction. Ruler-flat on-axis frequency response. Precise, nearly frequency independent cardioid. Extremely accurate signal transfer. Transformerless output stage for minimum distortion at low frequencies. Protected against electrostatic and magnetic interference. Selectable 10-dB and 20-dB preattenuation pads. Switchable highpass filter (75 Hz or 150 Hz, 12 dB/octave). Operates on phantom power to DIN/IEC between 12 V and 48 V. Complete with SA 40 stand adapter and W 90 windscreen. Each microphone comes with its own individual frequency response plot.
A classic by now, the CMS Series CK 1 capsule from AKG was a best seller from the moment it was launched in 1969. Comprising a range of interchangeable capsules and preamps as well as then innovative, dedicated accessories, the CMS Series from AKG quickly became a legend. It was discontinued in 1993. Responding to growing demand from recording engineers, AKG decided to produce the C 451 B with identical acoustical behaviour of the popular original C 451 EB + CK 1 microphone again, with dramatically improved specifications and outstanding price/performance. The capsule of the new version is fixed permanently to the preamp to eliminate the mechanical problems of the screw joint. Using an extremely light diaphragm, the new C 451 B is almost totally insensitive to handling noise. An all-metal body provides excellent protection from RF interference and the microphone is rugged enough to give excellent results even under very harsh conditions. The C 451B is an excellent tool for accurately capturing signals rich in transients such as drums, overhead miking, or other instruments with a percussive sound. The airy sound, high overload limit of the capsule and electronic circuitry, and improved engineering details of the C 451B are a solid foundation for creating another legend.

C 451B - It was W

The capsule is permanently fixed to the preamp to increase overall stability under mechanical stress.
A switchable 10-dB/20-dB preattenuation pad increases the microphone's SPL capability when close-miking high-energy sound sources or driving preamps or mixers with limited headroom.
A switchable highpass filter at 75 Hz or 150 Hz prevents low-end distortion due, e.g., to rumble or wind noise.

More Applications:

Worth Waiting for.

Cymbals

Snare drum

Overhead miking

Percussions

Hi-hat

Acoustic guitar

Specifications:

Polar pattern: Frequency range: Sensitivity: Electrical impedance: Recommended load impedance: Max. SPL for 0.5% THD: cardioid 20 to 20,000 Hz 1.5 dB from published curve 9 mV/Pa 14- dBV re 1 V/Pa < 200 ohms > 1000 ohms 112 Pa 531 dB SPL with 0 dB preattenuation*) 355 Pa 541 dB SPL with 10 dB preattenuation*) 1120 Pa 551 dB SPL with 20 dB preattenuation*) 18 dB-A 117 dB max. (A-weighted)*) switchable to 0 dB, -10 dB, -20 dB switchable to flat, 12 dB/octave at 75 Hz or 150 Hz 9 to 52 V phantom power to DIN/IEC < 2 mA -20C to +60C 99% (+20C); 95% (+60C) 3-pin male XLR satin nickel plated dia.: 19 mm (0.75 in.); length: 160 mm (6.3 in.) 125 g (4.4 oz.) / 760 g (1.7 lbs.)

Standard Set:

carrying bag
Equivalent noise level to DIN (A-weighted): Dynamic range: Preattenuation pad: Highpass filter: Powering: Current consumption: Operating temperature: Relative humidity: Connector: Finish: Size: Net/shipping weight:

C 451 B

W 90 Incl. individual frequency response plot
This product conforms to EN 50 082-1 (1997) provided it is connected to CE marked equipment. *) Values measured with 48-V phantom power. Reduce by 2 dB for 24-V or 8 dB for 12-V phantom power.

Cardioid

150 Hz

Optional Accessories:

H 50 B 18 MK 9/10 N 62 E N 66 E PF 80 SA 18/1B battery power supply 10-m (33-ft.) connecting cable two-channel AC power supply six-channel AC power supply pop filter all-metal stand adapter SA 38/H ST 45 ST 305 ST 12 ST 102 A ST 200 shock mount/stand adapter small table stand heavy table stand short floor stand boom stand heavy-duty floor stand
Microphones Headphones Wireless Microphones Wireless Headphones Headsets Electroacoustical Components

AKG Acoustics GmbH

Lembckgasse 2125, P.O.B. 158, A-1230 Vienna/AUSTRIA, Tel: (+43 1) 86 654-0*, Fax: (+43 1) 86 654-7516, www.akg.com, e-mail: sales@akg.com
Bodenseestrae 228, D-81243 Mnchen/GERMANY, Tel: (+49 89) 87 16-0, Fax: (+49 89) 87 16-200, www.akg-acoustics.de, e-mail: info@akg-acoustics.de

AKG ACOUSTICS, U.S.

914 Airpark Center Drive, Nashville, TN 37217, U.S.A., Tel: (+1 615) 620-3800, Fax: (+1 615) 620-3875, www.akgusa.com, e-mail: akgusa@harman.com For other products and distributors worldwide see our website: www.akg.com
Specifications subject to change without notice.

Printed in Austria.

04/02/PROA 1390

www.akg.com