Shure SM33 Technical Data

Model SM33
The Model SM33 is a compact and rugged uni-
directional ribbon microphone combining wide range
response and a Super-Cardioid directional pattern.
This polar pattern is somewhat more directional than
the conventional cardioid, providing excellent control
of unwanted surrounding noise and reverberation. The
performance characteristics are ideal for studio use
in broadcasting and recording and for critical sound
reinforcement applications.
The Model SM33 features:
Unusually effective Super - Cardioid pickup
characteristic minimizes effects of studio acous-
tics and background noise.
Warm, smooth sound from wide frequency re-
sponse range. Well suited to both voice and
music.
Low frequency response characteristic adjust-
able by means of a Response Selector Switch.
Built-in shock mount for quiet operation.
Rugged mechanical design and internal ribbon
protection assure reliable operation under se-
vere conditions of use.
SPECIFICATIONS
Type:
Ribbon.
Frequency Response:
Frequency Response Selector. See Figure A.
Polar Pattern:
Super-Cardioid (Unidirectional)
Response. See Figure D.
Impedance:
Dual. Choice of 30-50 ohms or
150-250 ohms. (Connected for 150-250 ohms when
shipped). See paragraph on impedance changing.
Output Level:
1,000 H
30-50 ohms
Model SM33
Open circuit voltage......
Power level......................
EIA Microphone Rating
Gm (sensitivity)....-150.5 db***
Model SM33 150-250 ohms
Open circuit voltage...- 76.5 db* (0.149 mv)
Power level.....................
EIA Microphone Rating
Gm (sensitivity) ....- 148.0 db***
* 0 db = 1 volt per microbar
** 0 db = 1 milliwatt with 10 microbars
*** 0 db = EIA Standard SE-105, August 1949
Connector:
Equipped with professional three-pin
female audio connector in microphone.†
† Designed to mate with Cannon XL series, Switchcraft A3
(Q.G.) series or equivalent connector.
40 to 15,000 Hz. Low
. response
Z
-
85.0 db* (0.056 mv)
-
57.5 db**
-
58.0 db**
Cable:
20 foot (6.1 m.) 2-conductor shielded
broadcast type equipped on microphone end with
professional three-pin female audio-connector.†
Case:
Die-cast zinc.
Finish:
Textured light and dark gray enamel.
Swivel:
Self adjusting lifetime swivel permits tilting
the head 45º foward and 70º backward.
Shock Mount:
Special live rubber vibration-
isolation unit.
Stand Thread:
5/8" -27 thread.
Stand Couplers:
Adapter for 1/2" pipe thread
or 5/8" -24 thread available upon request at no extra
charge.
Dimensions:
See Figure C.
Net Weight less Cable:
Shipping Weight:
3 1/4 Pounds (1474 grams)
Instructions for changing to 30-50 ohm
impedance:
See Figures B and C.
Remove the set screw (#2-56) at the receptacle
1.
end of the microphone.
2. Pull out the 3-prong insert from the receptacle.
Disconnect the BLACK lead from pin number 3.
3.
Solder the BLUE lead to pin number 3.
4.
Insulate end of the BLACK lead with tape.
5.
Re-assemble insert into receptacle and tighten
6.
set screw.
Guarantee:
Each microphone is guaranteed to be
free from electrical and mechanical defects for a
period of one year from date of shipment from facto-
ry, provided all instructions are complied with fully.
In case of damage, return the microphone to the
factory for repairs. Our guarantee is voided if the
microphone case is opened.
1 pound 10 ounces
(736 grams)