Model BG2.1 Unidirectional Dynamic Microphone

MODEL BG2.1

UNIDIRECTIONAL DYNAMIC MICROPHONE

The BG2.1 is a dynamic vocal microphone designed for quality sound reinforcement and project studio record- ing applications. Its dynamic cartridge features a smooth frequency response tailored for close-up vocals, and a neodymium magnet for high output level and high signal- to-noise ratio. The BG2.1 also maintains a uniform cardi- oid pattern throughout its frequency range, which ensures high gain-before-feedback, maximum isolation from unde- sired sound sources, and minimum off-axis sound color- ation. Its rugged construction, dent-resistant tapered grille, sturdy die-cast handle, and proven shock-mounting system allow the BG2.1 to maintain its excellent perfor- mance through even the roughest environments. Typical applications for the BG2.1 include close-up vocals, instru- ment pickup, public address, and high-profile karaoke.

GENERAL RULES FOR MICROPHONE USE

1.For optimal signal-to-noise ratio, place the microphone as close as practical to the desired sound source.

2.For the best gain-before-feedback and isolation from undesired background noise, aim the microphone to- ward the sound source and away from undesired sound sources (see Figure 1). The BG2.1 features a cardioid polar pattern which is most sensitive to sound directly in front of the microphone, and least sensitive to sound directly at 180 .

3.For the purest reproduction of sound, use no more than one microphone per sound source and use the fewest number of microphones necessary for the application.

4.For maximum isolation, keep the distance between mi- crophones at least three times the distance from each source to its microphone.

5.Work close to the microphone for extra bass response (see Figure 2). This phenomenon is known as proximity effect and can be used to achieve a fuller sound, espe- cially for vocals during soft passages where extra em- phasis is needed. For instruments, proximity effect can be used to change bass output without using tone con- trols.

6.Placing the microphone too close to acoustically reflec- tive (smooth, hard) surfaces will result in a poor frequen- cy response and will increase the chances for feed back. To minimize this effect, place microphones as far as possible from acoustically reflective surfaces.

7.Add an external windscreen when using the micro- phone outdoors to reduce wind noise. The A58WS windscreen is available in 7 different colors.

8.Do not cover any part of the grille with your hand (see Figure 3). Covering the grille alters the sound and dis- torts the polar pattern, increasing the chances for feed- back.

9.It is important to keep foreign particles out of the grille and the windscreen because they may alter the fre- quency response of the microphone. The grille may be periodically cleaned using warm, soapy water. Rinse with plain water and let it dry before replacing.

SPECIFICATIONS

Type

Dynamic

Frequency Response

80 to 15,000 Hz (see Figure 2)

Polar Pattern

Cardioid (unidirectional), symmetrical about axis (see Figure 4)

Output Impedance

Microphone Rated impedance is 150 Ω (290 Ω actual) for microphone inputs rated 75 to 300 Ω

Output Level (at 1,000 Hz)

Open Circuit Voltage* . . . . . . ± 54.0 dBV ( .200 mV) *1 Pascal = 94 db SPL

Polarity

Positive pressure on diaphragm produces positive voltage on pin 2 relative to pin 3 of the microphone out- put connector.

Environmental Conditions

This microphone will operate over a temperature range of ±29 to 57o C (±20 to 135o F), and at relative humidity of 0 to 95%.

Switch

Built in On/Off switch

Connector

3-pin male XLR connector designed to mate with Can- non XL series, Switchcraft A3 (Q.G.) series, or equiva- lent.

Case

Die cast zinc handle, black matte finish, dent-resist- ant tapered grille

Dimensions

See Figure 5

Net Weight

296 g (10.5 oz)

Certification

Eligible to bear CE Marking. Conforms to European EMC Directive 89/336/EEC. Meets applicable tests and performance criteria in European Standard EN55103 (1996) parts 1 and 2, for residential (E1) and light industrial (E2) environments.

FURNISHED ACCESSORIES

Storage Bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26A13 Break-Resistant Swivel Adapter . . . . . . . . . . . . . . . A25D 4.57 m (15 ft.) XLR-to-XLR cable . . . . . . . . . . . . 90J3860

OPTIONAL ACCESSORIES

Shock StopperTM Isolation Mount . . . . . . . . . . . . . . A55M Windscreen (7 colors available) . . . . . . . . A58WS Series 7.6 m (25 ft) Cable (XLR to XLR) . . . . . . . . . . . . . . . C25J

REPLACEMENT PARTS

Dent-Resistant Grille Assembly . . . . . . . . . . . . . RK350G Cartridge Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . R194

The BG2.1 is backed by the Shure 2-year warranty. For service or parts information, please contact the Shure Service department. Outside the United States, please contact your authorized Shure Service Center.