Shure_KSM44_User_Guide 电路图.pdf

2007, Shure Incorporated 27E3122 (Rev. 1) User Guide Printed in U.S.A. RadioFans.CN 收音机爱 好者资料库 1 SHURE INCORPORATED KSM44 MULTIPLE POLAR PATTERN CONDENSER MICROPHONE Thank you for selecting the KSM44 Over 75 years of audio experience has contributed to making the KSM44 one of the finest microphones available. If you have any questions not answered in this booklet, please contact Shure Applications Engineering at 847-600-8440, Monday through Friday, from 8:00am to 4:30 pm, CST. In Europe, call 49-7131-72140. Web address is . RadioFans.CN 收音机爱 好者资料库 2 FIGURE 1. KSM44 FRONT AND BACK GENERAL DESCRIPTION The Shure KSM44 is a side-address condenser microphone with multiple polar patterns (cardioid, omnidirectional, bidirectional). Designed for studio use, the KSM44 has externally biased, dual 1-inch diaphragms, extremely low self-noise and an extended frequency response specially tailored for vocal tracking and instrument recording. FEATURES Multiple polar patternscardioid, omnidirectional and bidirectionalfor maximum flexibility in a wide variety of recording applications. Dual 1 inch, externally biased, ultra-thin, 2.5 m, 24 Karat gold-layered, low mass, Mylar diaphragms provide superior frequency response Class A, discrete, transformerless preamplifier for transparency, extremely fast transient response and no crossover distortion. Minimizes harmonic and inter- modulation distortions. Premium electronic components and gold-plated internal and external connectors. Subsonic filter eliminates rumble from mechanical vibration below 17 Hz. Switchable 15 dB pad for handling extremely high sound pressure levels (SPLs). 3-position switchable low-frequency filter helps reduce unwanted background noise or counteract proximity effect. Integrated three-stage “pop” protection grille reduces plosives and other breath noise. Internal shock mount reduces handling and stand noise. KSM44 FRONT Polar Pattern Switch Low Frequency Response Switch 15 dB Attenuator KSM44 BACK RadioFans.CN 收音机爱 好者资料库 3 PERFORMANCE CHARACTERISTICS Extended frequency response Ultra-low self noise Exceptional low-frequency reproduction High output level High input SPL capability No crossover distortion Extremely uniform polar response Superior common mode rejection and suppression of radio frequency interference APPLICATIONS The KSM44 provides superior results in any application requiring a high quality microphone. Some typical applications are listed below. Voice-solo, background, voice-over or broadcasting Acoustic instruments such as piano, guitar, drums, percussion, strings Wind instruments-brass and woodwind Low-frequency instruments such as double bass, electric bass, kick drum Overhead miking-drums or percussion Ensembles-choral or orchestral Room ambience pick-up-guitar amplifier or drums Both the acoustic environment and microphone placement strongly affect the sound obtained from miking a source, especially with a high-resolution microphone like the KSM44. You may need to experiment with microphone placement, room treatments and polar pattern to achieve the best overall sound for each application. OPERATION Mounting Use either the ShureLock swivel mount or the elastic shock mount to secure the KSM44 to a floor or boom stand. When using the swivel mount, the internal shock mount provides good isolation from vibration. For even greater reduction of noise from external vibrations, use the elastic shock mount. Important: When using the swivel mount or elastic shock mount, be sure that the threaded, knurled locking grip is screwed securely onto the threads at the base of the microphone. Do not overtighten. Power The KSM44 requires phantom power and performs optimally with a 48 Vdc supply (IEC-268-15/DIN 45 596). However, it will operate with slightly decreased head- room and sensitivity with supplies as low as 11 Vdc. 4 Positioning the Microphone The front of the KSM44 is marked by thelogo and the polar-pattern selec- tion switch. See Figure 1. Position this side of the microphone toward the sound source to be recorded. The rear of the microphone is marked by the logo, the low-frequency filter switch and the 15dB attenuation switch. Selecting a Polar Pattern The three position switch on the front of the KSM44 sets the polar response pattern of the microphone. The sensitivity of the microphone to sounds coming from different angles varies according to this switchs setting. Cardioid. Picks up sounds directly in front of the microphone and is least sensi- tive to those in back. Cardioid is the most commonly used pattern in studio recording and live-sound applications. See Figure 5. Omnidirectional. Picks up sound equally from all directions. This pattern is best for picking up room ambience and miking several sources at once, such as a choir or ensemble. Omnidirectional patterns do not exhibit proximity effect. See Figure 7. Bidirectional. Picks up equally from the front and back of the microphone while rejecting sounds from the sides. Bidirectional is often for stereo recording (such as mid-side and Blumlein techniques). See Figure 9. NOTE: As with all bidirectional microphones, sounds picked up from the front will be in polarity with the source and those picked up from the back will be out of polarity with the source. Selecting Low-Frequency Response A three-position switch on the back of the KSM44 allows you to adjust the low-fre- quency response of the microphone, as shown in Figure 2. The low-frequency filter settings can be used to reduce wind noise, room noise or proximity effect. Flat response. Use this setting when you desire the most natural reproduction of the source. Low-frequency cutoff. Provides an 18 dB-per-octave cutoff at 80 Hz. Helps eliminate stage rumble or low-frequency room noise from heating, ventilation, or cooling systems. May also be used to compensate for proximity effect or to reduce low frequencies that make an instrument sound dull or muddy. Low-frequency rolloff. Provides a 6 dB-per-octave rolloff filter at 115Hz. Use this setting with vocals or instruments to compensate for proximity effect or to reduce low frequencies that could make an instrument sound dull or muddy. 20100050100 98765432 +5 0 10 Hz dB Flat Response Low-Frequency Cutoff Low-Frequency Rolloff FIGURE 2. LOW FREQUENCY FILTERS 5 Setting Attenuation The attenuation switch on the back of the KSM44 reduces the signal level from the cartridge by 15 dB without altering the frequency response. This can prevent extremely high SPLs from overloading the microphone. To activate attenuation, move the switch to the “-15 dB” position. Note: In situations where the high out- put of the KSM44 might overload the microphone preamplifier of a console or mixer, use an attenuation pad in the mixer. Load Impedance A load impedance of at least 1000 is recommended. When used with typical modern microphone preamplifiers (rated at about 2500 ), the KSM44 provides higher maximum SPL capability and output clipping level. With the -15 dB pad engaged, the KSM44 can handle up to 156 dB SPL and output +15 dBV into a 5500 ohm or greater load. Integral Pop Filter The KSM44 has an integral pop filter which helps reduce wind and breath noise. An external pop-protection screen or windscreen may be necessary when close-miking vocalists. The low-frequency cutoff filter may also be effective. See Figure 3. FIGURE 3.PS-6 POPPER STOPPER POP FILTER 6 SPECIFICATIONS *20 Hz to 20 kHz;THD < 1%. THD of the microphone preamplifier when applied input signal is equivalent to the cartridge output at specified SPL. *S/N ratio is difference between 94 dB SPL and equivalent SPL of self-noise A-weighted. Cartridge TypeExternally biased condenser Frequency Response20 to 20,000 Hz (See Figures 4, 6, 8) Output Impedance150 (actual) Attenuation Switch0 or 15 dB attenuation Low Frequency Response Switch Flat; -6 dB/octave below 115 Hz; -18 dB/octave below 80 Hz Phantom Power48 Vdc 4 Vdc (IEC-268-15/DIN 45 596), positive pins 2 and 3 Current Drain5.4 mA typical at 48 Vdc Common Mode Rejection50 dB, 20 Hz to 20 kHz PolarityPositive pressure on front diaphragm produces positive voltage on output pin 2 relative to pin 3 Directional Polar PatternsCardioid (See Figure 5) Omnidirectional (See Figure 7) Bidirectional (See Figure 9) Sensitivity (typical; at 1000 Hz; 1 Pa = 94 dB SPL) -31 dBV/Pa-37 dBV/Pa-36 dBV/Pa Self-noise (typical, equivalent SPL; A-weighted, IEC 651) 7 dB10 dB10 dB Maximum SPL 1000 Hz 2500 load (Attenuator on) 1000 load (Attenuator on) 132 (149) dB 127 (144) dB 138 (151) dB 132 (145) dB 137 (150) dB 131 (144) dB Output Clipping Level* 2500 load 1000 load 7 dBV 1 dBV 7 dBV 1 dBV 7 dBV 1 dBV Dynamic Range 2500 load 1000 load 125 dB 120 dB 128 dB 122 dB 127 dB 121 dB Signal to Noise ratio*87 dB84 dB84 dB Dimensions and Weight55.9 mm (2.20 in.) maximum body diameter, 187 mm (7.37 in.) long; 490.5 grams (17.30 oz). See Figure 10. 7 CARDIOID RESPONSE GRAPHS FIGURE 4. TYPICAL CARDIOID FREQUENCY RESPONSE FIGURE 5. TYPICAL CARDIOID POLAR PATTERN OMNIDIRECTIONAL RESPONSE GRAPHS FIGURE 6. TYPICAL OMNIDIRECTIONAL FREQUENCY RESPONSE FIGURE 7. TYPICAL OMNIDIRECTIONAL POLAR PATTERN 15 cm. 60 cm. 8 OMNIDIRECTIONAL RESPONSE GRAPHS FIGURE 8. TYPICAL BIDIRECTIONAL FREQUENCY RESPONSE FIGURE 9.TYPICAL BIDIRECTIONAL POLAR PATTERNS FIGURE 10. DIMENSIONS 55.9 mm (2.20 IN.) 187 mm (7.37 IN.) 9 CERTIFICATION Eligible to bear CE Marking; Conforms to European EMC directive 89/336/EEC. Meets applicable tests and performance criteria found in European Professional Audio Products EMC Standard EN 55103 (1996); Part 1 (emissions) and part 2 (immunity). The KSM44 is intended for use in environments E1 (residential) and E2 (Light Industrial) as defined in European standard EN 55103. EMC conform- ance is based on the use of shielded interconnecting cable. FURNISHED ACCESSORIES ShureLock Champagne Elastic Shock Mount . . . . . . . . . . . . . . . . . A44SM ShureLock Champagne Swivel Adapter. . . . . . . . . . . . . . . . . . . . . . . .A44M Aluminum Carrying Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A44SC Protective Velveteen Pouch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A44VB OPTIONAL ACCESSORIES Windscreen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A32WS Padded, Zippered Carrying Bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A32ZB Popper Stopper Pop Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PS-6 REPLACEMENT PARTS Suspension Shock Mount Elastic Cord, Champagne (contains one). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95B2125 SERVICE For additional microphone service or parts information, contact Shures Service department at 1-800-516-2525. Outside the United States, contact your Authorized Shure Service Center. N 108 Trademark Notices: The circular S logo, the stylized Shure logo, and the word “Shure” are registered trademarks of Shure Incorporated in the United States. “Shure Lock” is a trademark of Shure Incorporated in the United States. “Mylar” is a registered trademark of E.I. duPont de Nemours and Company in the United States. These marks may be registered in other jurisdictions. Patent Notice: Patent Des 447,131 SHURE Incorporated United States, Canada, Latin America, Caribbean: 5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A. Phone: 847-600-2000 U.S. Fax: 847-600-1212 Intl Fax: 847-600-6446 Europe, Middle East, Africa: Shure Europe GmbH, Phone: 49-7131-72140 Fax: 49-7131-721414 Asia, Pacific: Shure Asia Limited, Phone: 852-2893-4290 Fax: 852-2893-4055