C 562 BL
Boundary Layer Condenser Microphone
Description
The AKG Model C 562 BL condenser microphone is
designed for boundary layer mounting in environments where
a natural sound balance exists at one or more wall or floor
boundaries. Primary applications include front-of-stage floor
mounting, where proscenium and stage shell reflections often
provide an accurate “mix” of all musical details, suitable for
recording. Another primary application is as a table mounted
microphone for picking up conversations from all directions,
with none of the reflections, and consequent comb filtering,
that plague microphones mounted on desk stands. In its role
as a “half space” mounted microphone, its sensitivity is 6 dB
greater than if it were placed in free space. Its balance
between mid-frequency and low-frequency response is
directly related to the boundary perimeter. If it is used on a
temporary boundary, that boundary should have a perimeter
of 20 feet (6 meters) if smooth response is to be ensured
down to the lowest frequencies. The extremely small
diameter of the entrance to the electret transducer ensures
that the difference between on-axis and off-axis frequency
balance will be virtually zero. That is, sounds arriving from all
angles will maintain their spectral integrity.
Since the microphone normally operates in the transition
region between direct and reverberant fields, a random
incidence “correction” has been incorporated into the
microphone's response. This consists of a smoothly rising
response above 3 kHz that reaches an average level of +6 dB
over the range from 5 to 15 kHz. This provides a subjective
improvement in overall musical balance. In the recording
studio, boundary layer microphones provide a handy solution
to problems of micing the piano. They may be positioned in
pairs on the underside of the cover, with the cover up or
down, for surprisingly good stereo pickup.
Features
• Flat profile for accurate boundary
mounting
• Extended low and high frequency
response
• Uniform hemispherical response
• High sensitivity (20 mV/Pa)
• High acoustic level capability
(130 dB-SPL for 1.0% THD)
Specifications
Transducer Principle:
Pre-polarized condenser
Frequency Range:
20–20,000 Hz
Polar Pattern:
Hemispherically omnidirectional
Sensitivity at 1,00 Hz:
20 mV/Pa -34 dBV measured on a
boundary at least 1.5 m by 1.5 m
Equivalent Noise Level:
16 dB-A
Sound Pressure Level for 1% THD:
130 dB
S/N Ratio (A-weighted):
78 dB
Electr. Impedance:
< 600 ohms
Load Impedance:
> 2,000 ohms
Power Requirement:
Phantom powering, 9–52 volts
Connector:
3-pin XLR type
Cable Length:
10 ft. (3 m)
Finish:
Dark gray
Size:
6.3 in. (160 mm) diameter;
thickness of plate 0.35 in. (9 mm)
Net/Shipping Weight:
2.1 lbs. (0.95 kg)/4.2 lbs. (1.9 kg)
Included Accessories:
Foam-type windscreen
