AKG Acoustics C 451B - Manual

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.
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
Specifications
Transducer type: condenser
Frequency response: 20 Hz to 20 kHz
Sensitivity at 1 kHz: 9 mV/Pa (-41 dBV)
Self noise level: 18 dB-A
Dynamic range: 117 dB
Polar pattern: cardioid
Impedance: 200 ohms
Load impedance: >1000 ohms
Switchable pad: -10 and –20 dB
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: 12 dB/octave at 75 and 150 Hz
Power requirement: Phantom powering, 9 to 52 Vdc
Output connector: 3-pin XLR-M
Finish: Satin nickel
Size: .75 inches diameter (19 mm)
6.3 inches length (160 mm)
Net/shipping weight: 4.4 oz. (125 g)/1.7 lbs. (760 g)
Included accessories: SA 40 stand adapter
W 90 foam windscreen
padded carrying case
H 50 stereo bar (stereo pair only)