AKG Acoustics C562BL specifications Boundary Layer Condenser Microphone Description, Features

C 562BL

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.

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

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)