Shure_KSM27_User_Guide 电路图.pdf

User Guide 2005, Shure Incorporated 27D3138 (Rev. 6) Printed in U.S.A. RadioFans.CN 收音机爱 好者资料库 1 SHURE INCORPORATED KSM27 CARDIOID CONDENSER MICROPHONE Thank you for selecting the KSM27 Over 75 years of audio experience has contributed to making the KSM27 one of the finest microphones available. If you have any questions that are 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. Our web address is . RadioFans.CN 收音机爱 好者资料库 2 FIGURE 1. KSM27 FRONT AND BACK GENERAL DESCRIPTION The Shure KSM27 is a side-address condenser microphone with a cardioid polar pattern. Designed for studio use but rugged enough for live applications, the KSM27 has an externally biased 1-inch diaphragm, extremely low self-noise, and an extend- ed frequency response specially tailored for vocal tracking and instrument recording. FEATURES Cardioid polar pattern - the most commonly used pattern for both studio and live applications 1 inch, externally biased, ultra-thin, 2.5 m, 24 Karat gold-layered, low mass, Mylar diaphragm provides superior transient response Class A, discrete, transformerless preamplifier for transparency, extremely fast transient response and no crossover distortion, while minimizing harmonic and intermodulation 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 KSM27 BACKKSM27 FRONT Low-frequency response switch 15 dB attenuator RadioFans.CN 收音机爱 好者资料库 3 PERFORMANCE CHARACTERISTICS Extended frequency response 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 KSM27 produces superior results in any application requiring a high quality mi- crophone. Typical applications include: Voice and vocals Close-miking of acoustic instruments such as piano, guitar, violins, drums, and percussion Electric guitar amplifiers Brass and woodwind instruments Low-frequency instruments such as double bass and kick drum Overhead miking for drums or percussion Orchestras, choirs, wind ensembles Room ambience pick-up (guitar amplifier or drums) NOTE: Sound quality is strongly affected by microphone location and room acous- tics. To acheive the best overall sound for a particular application, it may be neces- sary to experiment with microphone placement and various room treatments. OPERATING THE KSM27 Mounting Use the shock mount to secure the KSM27 to a floor or boom stand by threading the shock mount onto the microphone stand and inserting/threading the microphone into the shock mount. Power The KSM27 requires phantom power and performs optimally with a 48 Vdc supply (IEC-268-15/DIN 45 596). However, it will operate with slightly decreased headroom and sensitivity with supplies as low as 11 Vdc. Most modern mixers provide phantom power. Phantom power can only be transmitted to the KSM27 through a cable termi- nated with XLR connectors at each end. 4 Positioning the Microphone The front of the KSM27 is marked by the logo. 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. Cardioid. Picks up sounds directly in front of the microphone and is least sen- sitive to those in back. Cardioid is the most commonly used polar pattern in studio recording and live-sound applications. See Figure 5. Selecting Low-Frequency Response A three-position switch on the back of the KSM27 lets you adjust the low-frequency response of the microphone. The low-frequency filter settings can be used to re- duce wind noise, room noise or proximity effect. Since the microphone will repro- duce ultra-low frequencies, the rubber isolated shock mount should be used to reduce low-frequency mechanical vibrations transmitted through the microphone stand. Flat response. Provides the most natural sound in most applications. Low-frequency cutoff. Provides an 18 dB-per-octave cutoff at 80 Hz. Helps eliminate floor rumble and low-frequency room noise from heating and air condition- ing systems. This setting may also be used to compensate for proximity effect or to reduce low frequencies that make an in- strument sound dull or muddy. Low-Frequency Rolloff. Provides a 6 dB-per-octave rolloff filter at 115Hz. Use this to compensate for proximity effect or to reduce low frequencies that could make an instrument sound dull or muddy. Setting Attenuation The attenuation switch on the back of the KSM27 reduces the signal level from the cartridge by 15 dB without altering the frequency response. This can prevent ex- tremely high SPLs (ie. close miked drums and guitar cabinets) from overloading the microphone. To activate attenuation, move the switch to the “-15 dB” position. 0 dB - Use this switch for “quiet” to “normal” sound levels. -15 dB - Use this switch position when in close proximity with extremely loud sound sources such as kick drum, snare drum, or loud guitar cabinets. 20100050100 98765432 +5 0 10 Hz dB Flat Response Low Frequency Cutoff Low Frequency Rolloff FIGURE 2. LOW FREQUENCY RESPONSES 5 Integral Pop Filter The KSM27 grille consists of 3 separate mesh layers that act as an integral pop filter which helps reduce wind and breath noise. Depending on the performer, an external pop-protection screen or windscreen (See Figure 3) may be necessary when close-miking vocalists. FIGURE 3. PS-6 POPPER STOPPER POP FILTER Load Impedance Shure recommends a load impedance of at least 1000 . When used with modern microphone preamplifiers (rated at 2500 ), the KSM27 provides higher maximum SPL capability and output clipping level. When the attenuation switch is set to the - 15 dB position, the KSM27 can handle sound pressure levels of up to 152 dB and output +15 dBV into a load of 2500 or greater. 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 Figure 4) Directional Polar PatternCardioid (see Figure 5) Output ImpedanceEIA Rated at 150 (140 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 Power 48 Vdc 4 Vdc (IEC-268-15/DIN 45 596), posi- tive pins 2 and 3 Current Drain5.4 mA typical at 48 Vdc Common Mode Rejection 50 dB, 20 Hz to 20 kHz Polarity Positive pressure on diaphragm produces posi- tive voltage on output pin 2 relative to pin 3 Dimensions and Weight 53.0 mm (2.08 in.) maximum body diameter, 156.2 mm (6.15 in.) long; 642 grams (22.6 oz.) (see Figure 6) Sensitivity (typical, at 1000 Hz; 1Pa = 94 dB SPL) -37 dBV/Pa Self-noise (typical, equivalent SPL; A-weighted, IEC 651) 14 dB Maximum SPL at 1000 Hz 2500 load (Attenuator on) 1000 load (Attenuator on) 137 (152) dB 132 (147) dB Output Clipping Level* 2500 load 1000 load 7 dBV 1 dBV Dynamic Range 2500 load 1000 load 123 dB 118 dB Signal to Noise ratio*80 dB 7 FIGURE 4. TYPICAL FREQUENCY RESPONSE FIGURE 5. TYPICAL POLAR PATTERNS FIGURE 6. DIMENSIONS 60 cm 202000010001000050100 98765432876543 +10 0 10 Hz dB 29 180 150 120 90 60 30 150 120 90 60 30 20 dB 15 dB 10 dB 5 dB +5 dB 180 150 120 90 60 30 150 120 90 60 30 20 dB 15 dB 10 dB 5 dB +5 dB 250 Hz 500 Hz 1000 Hz10000 Hz 6400 Hz 2500 Hz 156,2 mm (6.15 IN.) 150,1 mm (5.90 IN.) 50,8 mm (2.00 IN.) 53,0 mm (2.08 IN.) 8 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 KSM27 is intended for use in environments E1 (residential) and E2 (Light Industrial) as defined in European standard EN 55103. EMC conformance is based on the use of shielded interconnecting cable. FURNISHED ACCESSORIES ShureLock Rubber Isolated Shock Mount . . . . . . . . . . . . . . . . . . . . . .A27SM Protective Velveteen Pouch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A27VB OPTIONAL ACCESSORIES ShureLock Black Swive Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A32M Aluminum Carrying Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A32SC Windscreen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A32WS Popper Stopper Pop Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .PS-6 Padded, Zippered Carrying Bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A32ZB REPLACEMENT PARTS Rubber Rings for Shock Mount (contains four). . . . . . . . . . . . . . . . . . .RPM642 Replacement Foam for Carrying Case . . . . . . . . . . . . . . . . . . . . . . . . 29A2284 SERVICE For additional microphone service or parts information, please contact Shures Ser- vice department at 1-800-516-2525. Outside the United States, please contact your Authorized Shure Service Center. N 108 SHURE Incorporated Web Address: 5800 W. Touhy Avenue, Niles, IL 60714-4608, U.S.A. In U.S.A., Phone: 1-847-600-2000 Fax: 1-847-600-1212 In Europe, Phone: 49-7131-72140 Fax: 49-7131-721414 In Asia, Phone: 1-852-2893-4290 Fax: 1-852-2893-4055 International Fax: 1-847-600-6446 Trademark Notices: The circular S logo, the stylized Shure logo, and the word “Shure” are registered trademarks of Shure Incorporated in the United States. “ShureLock” 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. 400,540 Des. 447,131