User manual SHURE KSM27 REV 6

[. . . ] 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 extended 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 µm, 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 2 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 microphone. 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 acoustics. [. . . ] 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 conditioning systems. This setting may also be used to compensate for proximity effect or to reduce low frequencies that make an instrument sound dull or muddy. 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 +5 dB 0 ­10 20 50 100 2 Hz 3 4 5 6 7 89 1000 Flat Response Low Frequency Cutoff Low Frequency Rolloff FIGURE 2. LOW FREQUENCY RESPONSES 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 extremely 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. 4 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 STOPPERTM 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. 5 SPECIFICATIONS Cartridge Type Frequency Response Directional Polar Pattern Output Impedance Attenuation Switch Low Frequency response switch Phantom Power Current Drain Common Mode Rejection Polarity Dimensions and Weight Sensitivity (typical, at 1000 Hz; 1Pa = 94 dB SPL) Self-noise (typical, equivalent SPL; A-weighted, IEC 651) Maximum SPL at 1000 Hz 2500 load (Attenuator on) 1000 load (Attenuator on) Output Clipping Level* 2500 load 1000 load Dynamic Range 2500 load 1000 load Signal to Noise ratio** Externally Biased Condenser 20 to 20, 000 Hz (see Figure 4) Cardioid (see Figure 5) EIA Rated at 150 (140 actual) 0 or 15 dB attenuation flat; -6 db/octave below 115 Hz; -18 dB/octave below 80 Hz 48 Vdc ±4 Vdc (IEC-268-15/DIN 45 596), positive pins 2 and 3 5. 4 mA typical at 48 Vdc 50 dB, 20 Hz to 20 kHz Positive pressure on diaphragm produces positive voltage on output pin 2 relative to pin 3 53. 0 mm (2. 08 in. ) maximum body diameter, 156. 2 mm (6. 15 in. ) long; 642 grams (22. 6 oz. ) (see Figure 6) -37 dBV/Pa 14 dB 137 (152) dB 132 (147) dB 7 dBV 1 dBV 123 dB 118 dB 80 dB *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. 6 +10 dB 0 60 cm ­10 2 20 50 100 3 4 5 6 7 89 1000 2 Hz 3 4 5 6 78 9 10000 20000 FIGURE 4. TYPICAL FREQUENCY RESPONSE 150° 120° 180° 150° 120° 120° 150° 180° 150° 120° 90° ­20 dB ­15 dB ­10 dB ­5 dB 90° 90° ­20 dB ­15 dB ­10 dB ­5 dB 90° 60° 30° 60° 30° 60° 30° 60° 30° +5 dB +5 dB 250 Hz 500 Hz 1000 Hz 2500 Hz 6400 Hz 10000 Hz FIGURE 5. [. . . ] "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. 447, 131 SHURE Incorporated Web Address: http://www. shure. com 5800 W. [. . . ]