Cardioid Hanging Microphone Data Sheet

Architectural & Engineering
Specications
Earthworks, Inc. • 37 Wilton Rd. • Milford, NH 03055 • Phone: [phone], ext 114 • email: [e-mail] • earthworksaudio.com
The microphone shall be a back-electret condenser
type with a wide-range uniform frequency response
of 20 Hz to 30 kHz ±2 dB. The microphone shall
have an output level of 10 mV/Pa (C30/C) and
20mV/Pa (C30/HC). The microphone shall be of a
single capsule, single membrane design. The mi-
crophone shall have an impulse response with the
rise time no longer than 25 microseconds, and total
settling time, including the rise time, no longer than
120 microseconds. The microphone shall have po-
lar characteristics uniform in all planes to form a
cardioid of revolution for C30/C and a hypercardi-
oid of revolution for C30/HC. The microphone shall
accept sound pressure levels up to 145dB (C30/C)
or 139 dB (C30/HC) producing no more than 3%
THD. Dimensions shall be 9.84 in (250mm) long
by .860 in (22mm) diameter. The maximum head
diameter shall be .540 in (14mm) without the wind-
screen, and .9 in (23mm) with the windscreen. The
microphone shall be terminated with a 30 ft. (10m)
long braid-shielded Canare® StarQuad™ micro-
phone cable. The microphone shall require 24-48V
phantom power. The microphone shall be made of
metal with black or white nish. The Earthworks
C30/C and C30/HC is specied.
High Denition Microphones™ for Choir
The Earthworks ChoirMic™ series of Hanging High De-
nition Microphones™ provides astounding audio quality
for xed installations. The ChoirMics™ uniquely designed
small cardioid head and exible mini-gooseneck allow
it to be easily positioned. Their near perfect polar pat-
terns will not beam or spotlight and will provide more
gain before feedback. The frequency response at 90
degrees off-axis is within 2dB of the on-axis response.
These exceptional polar patterns allow the use of fewer
microphones with placement closer to the choir, obtain-
ing even more gain before feedback. The exceptional
rejection of sounds from the rear of the microphones
will dramatically reduce the sounds from an orchestra
or band in front of the choir. If you prefer stand mounting
for your choir microphones, look at the Earthworks Peri-
scope™ Series, which are identical to the ChoirMic™ se-
ries, except they terminate with XLR connectors instead
of an attached cable. The ChoirMic™ Series offers the
ultimate in sound quality, exibility and installation.
About High Denition Microphones™
During the last decade it has become commonplace for
sound recording and broadcast equipment to accommo-
date extended frequency responses up to 100kHz. With
few exceptions, even the very best of conventional pro-
fessional microphones do not offer frequency responses
above 20kHz. However, making a High Denition Micro-
phone involves far more than extending the frequency
response. Impulse response, diaphragm settling time
and pristine electronics are also key elements. Earth-
works’ founder David Blackmer foresaw the need for
higher quality microphones, and Earthworks has been
offering High Denition microphones, with extended
frequency response beyond 40kHz, since 1996. Earth-
works High Denition Microphones™ have an extremely
clean, natural on-axis pickup, and smooth, uncolored
off-axis response with high front-to-back rejection that
makes them superb for a wide range of applications in-
cluding sound reinforcement, broadcast, and recording
of voice and musical instruments. You will hear excep-
tional sound quality that is extremely accurate, detailed,
open and crystal clear even on analog or digital sound
systems that are limited to a 15kHz or 20kHz bandwidth.
You will notice a remarkable improvement in sound qual-
ity on nearly all audio systems when using Earthworks
High Denition Microphones™.
Polar Response
David Blackmer also invented a totally new approach
to microphone design, resulting in near-perfect polar
patterns. When you look at a polar pattern of an Earth-
works microphone, the mid frequencies, high frequen-
cies and low frequencies all look very close to a “text-
book” polar pattern. In practice this means the polar
response of an Earthworks microphone is extremely
uniform over its operating frequency range; the fre-
quency response at 90 degrees off-axis is very close
to the on-axis response. Such uniform polar response
results in less phase problems on the sides of the
microphone and there are fewer phase cancellations
when using multiple microphones placed close to-
gether. This new microphone technology also provides
more rejection of unwanted sounds from the rear of
the microphone and more gain before feedback in live
sound applications.
The ChoirMic™ Series
ChoirMic™ High Denition Microphones™ have a
30kHz high frequency response that enables them to
pick up high frequency overtones that conventional
microphones miss. In addition, they have an extreme-
ly fast impulse response that allows them to pick up
transients far more accurately. Their exceptionally
short diaphragm settling time will enable you to hear
subtle details that conventional microphones mask.
Specications
C30/C Frequency Response:
Polar Pattern:
C30/C Sensitivity:
C30/HC Sensitivity:
Power requirements:
Max Acoustic Input:
Output:
Output Impedance:
Min Output Load:
C30/C Noise:
C30/HC Noise:
Dimensions L x D:
Weight:
20Hz to 30kHz
Cardioid or Hypercardioid
10mV/Pa (-40dBV/Pa)
20mV/Pa (-34dBV/Pa)
24 - 48V Phantom, 10mA
145dB SPL (C) / 139dB SPL (HC)
Attached 30 ft. (10m) cable
with tinned leads (blue +)
65Ω, balanced (between pin 2 & 3)
600 ohms between pins 2 & 3
16dB SPL equivalent (A weighted)
20dB SPL equivalent (A weighted)
9.84 x .860 in. (250 x 22mm)
100g (0.22 lb.)
• Hear Detail That Other Microphones Miss
• 30kHz Frequency Response
• Uniform Frequency Response at 0°, 45°& 90°
• More Gain Before Feedback
• Exceptional Rejection of Sounds From the Rear
• 5” Mini-gooseneck with Small Microphone Head
• Very Easy to Position via Mini-gooseneck
• 30-foot Canare
®
StarQuad
™
Cable will not
Rotate with Time or Temperature Changes
• Available in Cardioid & Hypercardioid
• Available in Black or White
30kHz Cardioid & Hypercardioid
C30/C & C30/HC
Hanging High Definition Choir Microphones™
C30/C Polar
Response
Impulse Response
C30/HC
Polar
Response