AKG CHM 21 CARDIOID CONDENSER HANGING MICROPHONE

CHM 21 
 
Cardioid polar pattern
10 m (33 ft.) cable
125° pickup angle
Especially suited for choir recordings
Integrated spring steel clamp for optimum alignment

The new Discreet Acoustics Compact Series Condenser Hanging Microphone provides both
ease of use and a high level of functionality. There is hardly any more affordable and simpler
solution for recording choirs at worship centers. Suspended from the ceiling or a beam, the
hanging microphone is aligned and then fixed in the correct position. Now use the spring steel
clamp to adjust the correct angle, and off you go!
XY stereo recording
Using two CHM 21 hanging microphones in an XY configuration (coincident pair) is a good way
to make stereo recordings, particularly of choirs. However, sound source locations are defined
only by intensity differences. Adjusting the angle between the microphones determines the width
and depth of the stereo image.
ORTF stereo recording
Developed by the French Broadcasting Authority, this technique differs from the XY technique by
recording not only intensity differences, but also delay differences. The capsules are aligned at an
angle of precisely 110° and 170 mm / 6.7 in. apart.
 
SPECIFICATIONS:
Polar pattern Cardioid
Pickup angle 125°
Frequency range 70 to 18,000 Hz
Sensitivity 18 mV/PA = -35 dBV re 1 V/Pa
Max. SPL 125 dB (for 1% THD)
Equivalent noise level 73 dB
Impedance =2,000 ohms
Supply voltage 9 to 52 V phantom power to DIN 45596 (DPA adapter integrated)
Current consumption

AKG GN 30 OC., 12 inch gooseneck for D.A.M.-microphone capsules, 3/8“-connector, programmable indicator LED, incl. 10ft. cable to open-end, black, for installations

• Immune to RF interference
• Speech optimized frequency range
• Enhanced hypercardioid polar pattern
• High SPL capability
• Premium microphone for ubiquitous application

A History of Sound: The C 747, the so called „pencil microphone“, was first built in 1987. Due to its excellent technical specifications, especially the wide and flat frequency range, it was used for the recording of all kinds of musical instruments, even those with very low frequencies. Because of its brilliant sound reproduction and its inconspicuous optical appearance, it was quickly known as an ideal overhead microphone.
Thank to the narrow polar pattern it solved the crosstalk problem (when recording multiple instruments at once) and the problem of picking up sounds from distant spots in a room. But for all that, due to the help of the acoustically well balanced, short interference tube, it didnʼt face one of the biggest problems of most shotgun microphones – the change of the polar pattern over the frequency. This is one of many reasons why this microphone found its way into a great number of Broadcast Stations, Recording Studios, Theatres, Opera Houses, Churches, Conference Rooms and Lecture Halls.

Another big advantage of the C 747 is that the microphone will not change the sound or level too much even when the person speaking is moving a lot. So it came that the C 747 finally found its way into installed sound systems as a perfect speech and lectern microphone. The C 747 is now one of the most versatile microphones in the AKG product range and over the years it has been available in various versions and model types such as hanging module, capsule for modular gooseneck microphones and in a boundary layer microphone.

Whatʼs New in V11: As it is more and more used in conference applications, we carefully redesigned the C 747 to better cope with some specific installed sound issues.
The new C 747 V11 will have an integrated RFi shield to block out unwanted interference by mobile phones, wireless mics and the like. Also we have fine tuned the frequency response to give especially the spoken word an outstanding presence, without changing the flavour of the classic C 747 sound.

An enhanced polar pattern provides consistent off-axis rejection to control ambient noise and feedback in acoustically difficult environments. This makes the C 747 V11 an excellent choice for noisy discussion groups or reverberant pulpits while it is forgiving enough to clearly pick up talkers moving around in front of the microphone. A switchable LF roll-off filter suppresses mechanical noise. The low-impedance transformerless preamp operates on 9 to 52 V phantom power.
The C 747 V11 ships with an extensive accessory set including a shock mount/adapter, mini gooseneck, stand adapter, mounting clamp, thread link, and windscreen.

SPECIFICATIONS:

• Mini condenser microphone with clip-on mount and flexible gooseneck
  
• Polar pattern: cardioid
  
• Frequency range: 60 Hz to 20 kHz
  
• Sensitivity: 5 mV/Pa (-46 dBV)
  
• Max. SPL: 130/132 dB SPL (for 1 %/3 % THD)
  
• Equivalent noise level: 31 dB(A)
  
• Power requirement: B 29 L battery power supply, MPA V L phantom adapter, AKG WMS bodypack transmitters
  
• Connector: 3-pin XLR
  
• Cable: 1.5 m (5 ft.)
  
• Finish: Matte black
  
• Adapter plate included for easy attachment to PT 400 and PT 40.

The evolution e 908 instrument microphone is available in four variants:
as e 908 D for drums and percussion
as e 908 B for wind instruments, congas, and drums with free-floating suspension system
as e 908 B ew for the wireless miking of saxophones using an evolution wireless instrument transmitter
as e 908 T ew for the wireless miking of trumpets using an evolution wireless instrument transmitter

• Pick-up pattern : cardioid
• Frequency response : 40 ... 20 000 Hz
• Sensitivity in free field, no load : (1kHz) 4 mV/Pa, 0,56mV/Pa (e 908T-ew)
• Equivalent noise level : e908B-ew = 30 dB(A); e908B & e908D = 35 dB(A), e908T-ew = 39 dB (A)
• Max. Sound pressure level (aktiv) : 147 dB
• Nominal impedance : 100 Ohm (e908B & e908D)
• Min. terminating impedance : 2000 Ohm (e908B & e908D)
• Phantom powering : 12 - 48 V / 3 mA (e908B & e908D)
• Weight : ca. 140 g
• Dimensions : Ø 47 x 193 mm