Shure_Beta_SM7A_User_Guide 电路图.pdf
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1、GENERAL The Model SM7A is a dynamic microphone with a very smooth, flat, wide-range frequency response. It is meticulously designed for the most exacting music and speech requirements in profes- sional audio applications. The cartridge has been updated from the original SM7 with improved shielding a
2、gainst electromagnetic hum generated by computer monitors, neon lights, and other electrical devices. Features Flat, wide-range frequency response for exceptionally clean and natural reproduction of both music and speech Bass rolloff and mid-range emphasis (presence boost) controls with graphic disp
3、lay of response setting (see figure 3) Improved rejection of electromagnetic hum, optimized for shielding against broadband interference emitted by com- puter monitors Internal “air suspension” shock isolation virtually eliminates mechanical noise transmission Highly effective pop filter eliminates
4、need for any add-on protection against explosive breath sounds, even for close-up vocals or narration Yoke mounting with captive stand nut for easy mounting and dismounting provides precise control of microphone position Cardioid polar pattern, uniform with frequency and symmet- rical about axis, to
5、 provide maximum rejection and mini- mum coloration of off-axis sound Rugged construction and excellent cartridge protection for outstanding reliability APPLICATIONS The Model SM7A was field-designed in major recording stu- dios and scoring stages to be the finest dynamic microphone available for mu
6、sic recording and reproduction. Exacting labora- tory development programs augmented the field-derived specifi- cations and features to extend the advantages of the SM7A to a wide variety of critical professional audio applications. The exceptional performance and unique features of the SM7A make it
7、 the outstanding choice for such applications as: Recording StudioInstrumental and Vocal Location Recording Motion Picture and Television Scoring Television Talk Shows and News Desks Radio Announcing and Production Narration MOUNTING INSTRUCTIONS The SM7A can be mounted on a microphone stand or hung
8、 from a boom. It is shipped in the boom mounting configuration (see figure 1). To set up the SM7A in the microphone stand mounting configuration (see figure 2), proceed as follows: 1. Remove tightening nuts on the sides (see figure 7). 2. Remove the fitted washers, the lock washers, the outer brass
9、washers, and the brass sleeves. 3. Slide the bracket off the microphone. Be careful not to lose the washers still on the microphone. 4. Invert and rotate the bracket. Slide it back onto the bolts over the brass and plastic washers still on the microphone. The bracket should fit so the XLR connector
10、faces the rear of the microphone, and the Shure logo on the back of the microphone is right-side up. 5. Replace the brass sleeves. Be sure they are seated proper- ly within the inner washers. 6. Replace the outer brass washers, the lock washers and the fitted washers. 7. Replace the tightening nuts
11、and tighten the microphone at the desired angle. NOTE: If the tightening nuts do not hold the microphone in position, one or both of the brass sleeves may not be properly seated within all the washers. RIGHT SIDE VIEW REAR VIEW BOOM MOUNTING CONFIGURATION FIGURE 1 Model SM7A User Guide 27B3076 (TF)
12、2000, Shure Incorporated Printed in U.S.A. RadioFans.CN 收音机爱 好者资料库 2 RIGHT SIDE VIEWREAR VIEW XLR CONNECTOR MICROPHONE STAND MOUNTING CONFIGURATION FIGURE 2 SPECIFICATIONS Type Dynamic Frequency Response 50 to 20,000 Hz (see Figure 3) FLAT RESPONSE BASS ROLLOFF PRESENCE BOOST TYPICAL FREQUENCY RESPO
13、NSE FIGURE 3 Polar Pattern Cardioid (unidirectional)uniform with frequency, sym- metrical about axis (see Figure 4) TYPICAL POLAR PATTERNS FIGURE 4 Impedance Microphone impedance rating is 150 (150 actual) for connection to microphone inputs rated at 19 to 300 ohms. Phasing Positive pressure on diap
14、hragm produces positive volt- age on pin 2 relative to pin 3. Output Level (at 1,000 Hz) Open Circuit Voltage* 59.0 dB (1.12 mV). . . . . . . . . . *0 dB = 1 volt per Pascal Electromagnetic Hum Sensitivity (Typical, Equivalent SPL/milliOersted) 60 Hz: 11 dB 500 Hz: 24 dB 1 kHz: 33 dB Switches Bass r
15、olloff and mid-range emphasis: Slotted response selector switches. See Figure 3 for bass rolloff and mid-range emphasis (presence boost) response. See Figure 3 for location of switches. Response Selector Switch Cover Cover plate (supplied) can be used to prevent accidental change of response setting
16、. Cartridge Shock Mount Internal air-suspension shock and vibration isolator. Microphone Connector Three-pin professional audio connector designed to mate with Cannon XL series, Switchcraft A3 (Q-G) series or equivalent connector. Swivel Assembly Integral part of microphone with captive nut for ease
17、 of attachment to stand, suitable for mounting on stand with 5/8 in.27 thread. Case Dark gray enamel aluminum and steel case with dark gray foam windscreen. Dimensions See Figure 5. 95 mm (3.75 in.) 189.7 mm (7.469 in.) 25.4 mm (1.0 in.) 48 mm (1.890 in.) 117 mm (4.594 in.) 96 mm (3.775 in.) 63.5 mm
18、 (2.500 in.) OVERALL DIMENSIONS FIGURE 5 Net Weight 765.4 grams (1 lb, 11 oz) VOICE COIL CODED TERMINAL BLACK 240 mH 11 mH HUM BUCKING COIL .22 F x 35 V YELLOW GREEN WHITE BLACK CLEAR CASE GROUND GREEN SHIELD SWITCH PLATE (VIEWED FROM TERMINAL SIDE) BASS ROLLOFF SWITCHPRESENCE BOOST SWITCH 12 3 INTE
19、RNAL CONNECTIONS FIGURE 6 Certification Eligible to bear CE marking. Conforms to European EMC Directive 89/336/EEC. Meets applicable tests and perfor- mance criteria in European Standard EN 55103 (1996) parts 1 and 2, for residential (E1) and light industrial (E2) environments. FURNISHED ACCESSORY S
20、witch Cover PlateRPM602. . . . . . . . . . . . . . . . . . . . . . . . . . OPTIONAL ACCESSORIES Desk StandS37A, S39A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cable and Plug Assembly (7.6m 25 ft)C25F. . . . . . . . . . . . RadioFans.CN 收音机爱 好者资料库 3 REPLACEMENT PART CartridgeRPM106. .
21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . WindscreenRK345. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Nut/WashersRPM604. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ARCHITECTS SPECIFICATIONS The microphone shall be a moving coil (d
22、ynamic) type with a frequency response of 50 to 20,000 Hz. The unit shall have a cardioid polar characteristic. The cancellation at the sides shall be approximately 6 dB and the cancellation at the rear shall be 15 to 20 dB. The microphone shall be low impedance with a rated impedance of 150 ohms fo
23、r connection to microphone inputs rated at 19 to 300 ohms. The microphone output shall be 57.0 dB where 0 dB = 1 milliwatt per Pascal. The microphone shall have two switches for controlling the frequency response. The first switch is a Bass Rolloff selector switch. One position of this switch provid
24、es a flat low frequency response and the second position provides a gradual low frequency rolloff. The second switch is the Mid-Range Emphasis (presence boost) switch. One position of this switch provides a flat mid-range frequency response and the second position raises the level of the mid-range f
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