Shure SM33 User Guide
222 HARTREY AVE., EVANSTON, IL., 60204 U.S.A. .
GENERAL
The Model SM33 is a compact and rugged unidirectional ribbon microphone combining wide range response and a supercardioid 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.
AREA CODE
312/666-2200
. CABLE:
SHUREMICRO
Microphone Features:
n Unusually effective supercardioid pickup pattern
minimizes effects of studio acoustics and background , noise.
n Warm, ‘smooth sound from wide frequency re-
sponse range.
n Particularly well suited for both voice and music,
with Response Selector Switch for adjustment of
low-frequency response.
n Built-in shock mount for quiet operation.
n Rugged mechanical design and internal ribbon
protection assure reliable performance under
rigorous operating conditions.
IMPEDANCE SELECTION
Model SM33 is shipped connected for 150 ohm impedance. To change to 38 ohms, proceed as follows
(see Figure
1):
1. Remove the No. 2-56 setscrew at the receptacle
end of the microphone.
2. Carefully pull out the 3-pin male insert from the
receptacle.
3. Disconnect (unsolder) the BLACK lead from pin
3. Insulate the end of the BLACK lead with tape.
4. Solder the BLUE lead to pin 3.
5. Reassemble the male insert in the receptacle
and securely tighten the setscrew.
SPECIFICATIONS
Type
Ribbon
Frequency Response
40 to 15,000 Hz (see Figure 2)
TYPICAL FREQUENCY RESPONSE
FIGURE 2
Polar Pattern
Supercardioid (unidirectional). See Figure 3
INTERNAL CONNECTIONS
FIGURE 1
RESPONSE SELECTION
The slotted Response Selector Switch is below the
nameplate at the front of the microphone. The Music
Position
the Voice Position
“M”
provides a flat low-frequency response;
“V”
provides a rolled-off low-
frequency response. (See Figure 2.)
Copyright 1979,
27A1544 (TA)
Shure
Brothers Inc.
(OVERJ
TYPICAL DIRECTIONAL PATTERN
FIGURE 3
Impedance
Dual. Microphone rating impedance is 38 ohms
(50 ohms actual) or 150 ohms (280 ohms actual) for
connection to microphone inputs rated at 19 to 75
ohms or 75 to 300 ohms. Wired for 150 ohms as
supplied. (See Impedance Selection to change im-
pedance.)
U.S. Patent
Printed in
D178,OiB
U.&A
Output Level (at 1,000 Hz)
38 ohms
150 ohms
Open Circuit Voltage* . . -86.0 dB -78.0 dB
(.050 mV) (.124 mV)
Power Level** . . . . . . . . . . . . -59.0 dB
-58.5 dB
*0 dB = 1 volt per microbar
**0 dB = 1 milliwatt per 10 microbars
Hum Pickup (typical in 60 Hz field)
39.0 dB equivalent SPL/millioersted (Response
Selector Switch in “M” position)
Switch
Slotted, rotary-type, Voice-Music Response Selector
Switch (see Figure 2 for rolled-off and flat lowfrequency response)
Cable
6.1 m (20 ft) rubber-jacketed, two-conductor shielded
cable, with female three-pin professional audio connector* on microphone end
*Designed to mate with Cannon XL series, Switchcraft A3
(Q.G.) series, or equivalent connector
Swivel and Shock Mount Assembly
Positive action, permits tilting head through 55° forward and 70° backward; shock-mounted with internal rubber vibration-isolator; suitable for mounting
on stand with 5/8”-27 thread
Case
Nonreflecting gray enameled die casting with alu-
minum grille
Dimensions
See Figure 4
Packaged Weight
1.48 kg (3¼ lb)
ARCHITECTS’ SPECIFICATIONS
The microphone shall be the Shure Model SM33 or
equivalent. The microphone shall be a moving ribbon
type with a frequency response of 40 to 15,000 Hz.
The unit shall have a supercardioid polar characteristic. The cancellation at the sides shall be approximately
7 dB, and the cancellation at the rear shall be 5 to
13 dB. The microphone shall be a dual-impedance unit
with rated impedances of 38 ohms and 150 ohms for
connection to microphone inputs rated at 19 to 75
ohms and 75 to 300 ohms. The microphone output
shall be:
38 ohms . . . . . . . . . . . -59.0 dB
150 ohms . . . . . . . . . . . . . . . -58.5 dB
(0 dB = 1 milliwatt per 10 microbars)
The microphone shall be equipped with a built-in
two-position Response Selector Switch providing either
flat or rolled-off low-frequency response. The microphone shall be equipped with a swivel and shock
mount assembly with an internal rubber vibrationisolator. The swivel shall be adjustable through 55°
forward and 70° backward, and shall be suitable for
mounting on a stand having a 5/8”-27 thread. The microphone shall be provided with a 6.1m (20 ft) detachable rubber-jacketed, two-conductor shielded cable
with a female three-pin professional audio connector*
at the microphone end.
The overall dimensions of the microphone shall be
202 mm (7-1/32 in.) in length, 34.9 mm (1-3/8 in.) in
width, and 52.4 mm (2-1/16 in.) in depth.
*Designed to mate with Cannon XL series, Switchcraft A3
(Q.G.) series, or equivalent connector
OVERALL DIMENSIONS
FIGURE 4
Net Weight (less cable)
736 grams (1 lb, 10 oz)
OPTIONAL ACCESSORIES
Desk Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .S33P
Quick Disconnect Adapter . . . . . . . . . . . . . . . . . . . . .A45
REPLACEMENT PARTS
Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C50
Cable Connector . . . . . . . . . . . . . . . . . . . . . . . . . . RK120P
GUARANTEE
This Shure product is guaranteed in normal use to
be free from electrical and mechanical defects for a
period of one year from date of purchase. Please
retain proof of purchase date. This guarantee includes
all parts and labor. This guarantee is in lieu of any
and all other guarantees or warranties, express or
implied, and there shall be no recovery for any consequential or incidental damages.
SHIPPING INSTRUCTIONS
Carefully repack the unit and return it prepaid to:
Shure Brothers Incorporated
Attention: Service Department
1501 West Shure Drive
Arlington Heights, Illinois 60004
If outside the United States, return the unit to your
dealer or Authorized Shure Service Center for repair.
The unit will be returned to you prepaid.
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