QTC40
Pin 1
“Shield”
Pin 2
“+”
Pin 3
“
-
”
Description
The Earthworks QTC40 is an omnidirectional (pressure)
pre-polarized condenser microphone directly coupled to
a dedicated wideband, low output impedance preampli-
fier. The QTC40 requires a standard 48V phantom power
supply. It features an extended linear free-field frequency
response from 4Hz to 40kHz, extremely fast impulse re-
sponse, low self-noise, very low handling noise, uniform
polar pattern, and high SPL handling capabilities. It exhib-
its no proximity effect.
Each microphone is delivered with its own calibration chart
providing the individually measured frequency response
curve. A mounting clip is included with the microphone.
Applications
The Earthworks QTC40 is easy to operate. Connect the
microphone to a microphone preamplifier supplying 48V
phantom power using a standard XLR microphone cable.
Please allow up to one minute for the microphone to settle.
Plugging in the microphone “hot” (phantom power already
present at the input) will not damage the microphone, and
is actually preferred for faster settling. It is normal for any
phantom powered mic to “pop” when plugged in or pow-
ered up. Make sure to mute the signal to speakers or head-
phones when phantom power is first applied.
The QTC40 is designed for recording quieter sources such
as vocals, strings, woodwinds, and distant-miked orches-
tras or choirs. For classical location recording a matched
pair will provide spectacular results. The QTC40 will faith-
fully reproduce sound with impeccable detail and does not
exhibit the typical problems and limitation exhibited with
conventional microphones. Its impulse response and dia-
phragm settling time is exceptional, resulting in very natu-
ral and uncolored sound.
This microphone has no removable parts.
Care of Microphone
The Earthworks QTC40 High Definition Microphone
™
is a
precision instrument designed and built to provide years
of top performance. Following these simple rules will help
to protect your investment in the QTC40:
Specifications
Frequency response: 4Hz to 40kHz +1/-3dB
Polar Pattern: Omnidirectional
Sensitivity: 30mV/Pa (Typical)
Power Requirements: 48V Phantom, 10mA
Peak Acoustic Input: 142dB SPL
Output: XLR-3
Output Impedance: 100Ω, balanced; (50Ω ea. pin 2 & 3)
Minimum Load: 600Ω btw. pins 2 & 3
Noise: 22dB, A equivalent
Dimensions L x D: 229 x 22 mm (9 x .860 in.)
Weight: 225g (.5lb)
Specifications are subject to change without notice.
Avoid touching the front protective screen.
Never attempt to disassemble the microphone –
it cannot be opened.
Avoid extreme heat and condensing humidity.
Allow the microphone to warm up in the case when
bringing it in from the cold weather.
Rough handling may damage the microphone even
if no visible marks are left.
When not in use keep the QTC40 in its case.
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XLR Output Connector Assignment of QTC40
Impulse Response of QTC40 (typical)
Polar Response of QTC40 (typical)
Frequency Response of QTC40 (typical)
