Description
The Model RE45N/D is a highly directional
microphone utilizing a combination of char-
acteristics of cardioid and distributed front
opening designs. The microphone incorpo-
rates a revolutionary neodymium alloy mag-
net to provide high sensitivity and low
weight. The exceptional sensitivity of the
RE45N/D combined with the inherent low
noise of a dynamic transducer insures a high
signal-to-noise ratio necessary for those long
reach applications. The transducer and inte-
gral high pass filtering have been designed
to reduce most low frequency handling
noises found in handheld applications.
The cardioid action gives the microphone
uniform characteristics for frequencies up to
1,500 Hz. For frequencies above 1,500 Hz
the distributed front openings take effect pro-
viding narrower directional characteristics as
illustrated in the polar pattern, Figure 3. Ex-
tra care has been taken in adjusting the di-
rectional pattern of this microphone to pro-
vide smooth off-axis frequency response.
Older design wave-interference microphones
often have large peaks and dips in the off-
axis response. The irregular off-axis response
of the older designs can create problems as
the rejection varies widely as the microphone
is moved only slightly due to the lobing of the
polar pattern. The smooth RE45N/D polar
pattern makes the aiming of the microphone
at the desired sound source less critical than
those older design shotgun microphones while
still providing better directivity than that of
conventional unidirectional microphones.
Benefits derived from this new design in-
clude wide range response, smooth polar
response, high sensitivity and high directiv-
ity. These features make possible a working
distance which is two to three times that of
conventional directional microphones. The
RE45N/D has been especially designed
for handheld use and includes a switch-
able 250-Hz high-pass filter to further re-
duce wind and handling noise. The remov-
able Warm-Grip
TM
handle is designed to fit
over the microphone connector and the short
handle of the rnicrophone.
Applications Notes
The RE45N/D is shipped with a windscreen.
If the microphone is to be used outdoors it is
recommended that the supplied windscreen
be used. This windscreen comes with a self-
adhesive ring for attaching to the RE45N/D
microphone for better shielding. The wind-
screen will only have to be removed for oc-
casional cleaning or special mounting appli-
cations.
The RE45N/D may also be used with the
supplied model 323 stand clamp for fixed
applications such as podiums. Here the
higher directivity will reduce the chance of
feedback and the shape of the low frequency
response prevents boominess. The tube and
handle, less the Warm-Grip
TM
fit in most
standard 3/4-inch stand clamps such as
Electro-Voice model 312. Without the
windscreen, the RE45N/D can be used with
the model 307 shock mount. For more se-
cure permanent mounting the 310 clamp fits
over the handle portion of the RE45N/D.
Architects’ and Engineers’ Specifications
The microphone shall be a highly directional
dynamic type with a combination cardioid
and distributed front opening principles and
with a frequency response from 150 to
15,000 Hz. From the sides, above 2,000 Hz,
the microphone shall exceed cancellation of
10 dB.
Sensitivity shall be 5 mV/Pascal or greater.
The transducer shall employ a hum-buck coil
with a resulting – 130 dBm at 60 Hz in a 1 m
Oe field.
The diaphragm shall be nonmetallic
Acoustalloy and shall have a shield to pre-
RE45N/D
Cardiline N/DYM
®
Dynamic Shotgun
Microphone
• Highly directional above 1500 Hz
• High sensitivity–5mV/Pn
• 250 Hz high pass filter
• Cardoid polar pattern below 1500 Hz
• Complete with windscreen and
warm-grip™
