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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 |
Polar pattern Cardioid
Frequency range 70 to 18,000 Hz
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 IEC 61938 (DPA adapter integrated)
Powering |
Shure MX418D-C Gooseneck Cardioid Condenser Microphone
Microflex? Gooseneck microphones bring a whole new meaning to the word flexible
with their fully adjustable gooseneck. Designed for easy replacement and available in
cardioid, supercardioid and omnidirectional polar patterns, the interchangeable cartridges
offer wide frequency response and accurate sound reproduction for a wide variety of applications
such as houses of worship, courtrooms and conference centers. Plus, the condenser cartridges
fit every model in the Microflex product line for enhanced convenience and consistent sound.
Microflex Gooseneck microphones are available in four models with a variety of heights and mounting
styles to choose from. One model includes a silent mute switch with LED indicator, a Shure Microflex
exclusive. And every Microflex Gooseneck features high sensitivity and balanced, transformerless output
for maximum resistance to electromagnetic hum and RF interference, even over long cable runs.
Desktop Base with 10 foot Cable, Logic Functions, Programmable Switch and LED Indicator, Snap-Fit Foam Windscreen
Features:
Wide dynamic range and frequency response for accurate sound reproduction across the audio spectrum
Interchangeable cartridges provide the right polar pattern for every application
Balanced, transformerless output for increased immunity to noise over long cable runs
Shock mount provides over 20 dB isolation from surface vibration noise
Locking flange mount for permanently securing microphone to lecterns, pulpits, or conference tables
Snap-fit foam windscreen
Programmable on/off switch and LED on/off indicator (M412D/MX418D)
New brighter LED improves visibility under strong ambient lighting M412D/MX418D)
Logic input and output terminals for remote control or use with automatic microphone mixers M412D/MX418D)
Supplied shock mount for more than 20 dB isolation from surface transmitted noise (MX412SW/MX418SE)
Supplied threaded flange mount for permanently securing the microphone to a lectern, pulpit, or conference table (MX412SW/MX418SE)
Microphone Specifications:
Frequency Response
50 to 17,000 Hz
Output Impedance
180 ohms actual (EIA rated at 150 ohms)
Sensitivity (At 1,000 Hz, open circuit voltage*)
Cardioid: -35.0 dBV/Pa (17.8 mV)
Supercardioid: -33.5 dBV/Pa (21.1 mV)
Omnidirectional: -27.5 dBV/Pa (42.2 mV)
All values -12 dB at 0 gain; *1 Pascal = 94 dB SPL
Maximum SPL (1 kHz at 1% THD, 1 k ohm load)
Cardioid: 124.2 dB
Supercardioid: 122.7 dB
Omnidirectional: 116.7 dB
All values +6 dB at 0 gain
Equivalent Output Noise (A-weighted)
Cardioid: 28.0 dB SPL
Supercardioid: 26.5 dB SPL
Omnidirectional: 20.5 dB SPL
Signal to Noise Ratio (referenced at 94 dB SPL)
Cardioid: 66.0 dB
Supercardioid: 67.5 dB
Omnidirectional: 73.5 dB
Dynamic Range at 1 k ohm load
96.2 dB
100 dB at 0 gain
Common Mode Rejection
45.0 dB minimum
Preamplifier Output Clipping Level (1% THD)
-6.0 dBV (0.5 V)
-12 dBV at 0 gain
Polarity
Positive sound pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of output connector.
Power Requirements
11 to 52 Vdc phantom, 2.0 mA
Environmental Requirements
Operating Temperature Range: -18 to 57 degrees C (0 to 135 degrees F)
Relative Humidity: 0 to 95% |
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
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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
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Dimensions : Ø 47 x 193 mm
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- Hypercardioid polar pattern
- 38 cm long
- 95° pickup angle
- For acoustically difficult environments
- Connects easily via XLR connector
The hypercardioid polar pattern with its narrow 95° pickup angle is suited best for situations where noise typically occurs from all sides (particularly in worship centers), where people talk into the microphone from a greater distance, or where several talkers are grouped side by side. Two different lengths are available. The .exible joint ensures optimum alignment of the gooseneck to any talker position. Several options are available for installation, i.e., stand, tabletop installation, and lockable.
Choosing polar patterns
Selecting the correct polar pattern for installed sound is difficult since it depends on a variety of factors. Of course the acoustics of the room play a key role. For highly reverberant rooms such as worship centers, a hypercardioid polar pattern will be the best choice to avoid high levels of unwanted noise. Correct placement of the loudspeakers is also essential. If the speakers project right at the capsule, a hypercardioid will be your best bet. The most difficult task, however, is trying to judge how the talkers will behave. For talkers who are inexperienced or move around a lot, be sure to choose a cardioid polar pattern for reliable pickup; talkers at a greater distance from the mic will be served best by a hypercardioid.
The microphone shall be a hypercardioid gooseneck microphone. Its pickup angle shall be 95 degrees; frequency range 50 Hz to 19 kHz; sensitivity 12 mV/Pa; max. SPL 125 dB; electrical impedance
| Polar pattern |
Hypercardioid |
| Frequency range |
50 to 19,000 Hz |
| Sensitivity |
12 mV/PA = -38 dBV re 1 V/Pa |
| Max. SPL |
125 dB (for 1% THD) |
| Equivalent noise level |
|
| Signal/noise ratio (A-weighted) |
>73 dB |
| Impedance |
=2,000 ohms |
| Supply voltage |
English: 9 to 52 V phantom power to IEC 61938 (DPA adapter integrated) |
| Powering |
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| Connector |
3-pin male XLR |
| Finish |
matte black |
| Dimensions |
CGN 99 H/S: 13.5 x 380 mm (0.5 x 15 in.);
CGN 99 H/L: 13.5 x 580 mm (0.5 x 23 in.) |
| Net weight |
CGN 99 H/S: 480 g (17 oz.);
CGN 99 H/L: 500 g (17.7 oz.) |
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