Shure Beta 181 Load Impedance, Power Requirements, Accessories and Parts, Furnished Accessories

Load Impedance

Maximum SPL capability, output clipping level, and dynamic range vary with the input load impedance of the preamplifier to which you connect the microphone. Shure recommends a minimum input load impedance of

1000 Ω. Most modern microphone preamplifiers meet this requirement.

Higher impedance results in better performance for these specifications.

Power Requirements

This microphone requires phantom power and performs best with a 48 Vdc supply (IEC-61938). However, it will operate with slightly decreased head- room and sensitivity with supplies as low as 11 Vdc.

Most modern mixers provide phantom power. You must use a balanced mi- crophone cable: XLR-to-XLR or XLR-to-TRS.

SPECIFICATIONS

Cartridge Type	Electret Condenser
Polar Pattern	181/C:	Cardioid
	181/S:	Supercardioid
	181/O:	Omnidirectional
	181/BI:	Bidirectional
Frequency	20 to 20,000 Hz
Response
Output	110 Ω
Impedance
Sensitivity	Cardioid:	–46.5 dBV/Pa[1] (2.4 mV)
open circuit volt-	Supercardioid:	–49.5 dBV/Pa[1] (2.5 mV)
age, @ 1 kHz,	Omnidirectional:	–52.0 dBV/Pa[1] (2.6 mV)
typical	Bidirectional:	–51.0 dBV/Pa[1] (2.6 mV)
Maximum SPL	2500 Ω load:	Cardioid:	151.5 dB SPL
1 kHz at 1%		Supercardioid:	154.5 dB SPL
THD[2]		Omnidirectional:	157.0 dB SPL
		Bidirectional:	156.0 dB SPL
	1000 Ω load:	Cardioid:	149.0 dB SPL
		Supercardioid:	152.0 dB SPL
		Omnidirectional:	154.0 dB SPL
		Bidirectional:	153.5 dB SPL
Signal-to-Noise	Cardioid:	73.5 dB
Ratio[3]	Supercardioid:	71.5 dB
	Omnidirectional:	70.5 dB
	Bidirectional:	71.0 dB
Dynamic Range	2500 Ω load:	Cardioid:	131.0 dB
		Supercardioid:	132.0 dB
		Omnidirectional:	133.5 dB
		Bidirectional:	133.0 dB
	1000 Ω load:	Cardioid:	128.5 dB
		Supercardioid:	129.5 dB
		Omnidirectional:	130.5 dB
		Bidirectional:	130.5 dB
Clipping Level	2500 Ω load:	10.5 dBV
@ 1 kHz, 1%	1000 Ω load:	7.5 dBV
THD
Self Noise	Cardioid:	20.5 dB SPL-A
equivalent SPL,	Supercardioid:	22.5 dB SPL-A
A-weighted,	Omnidirectional:	23.5 dB SPL-A
typical	Bidirectional:	23.0 dB SPL-A
Common Mode	≥55 dB
Rejection
20 to 20,000 kHz
Polarity	Positive pressure on diaphragm produces positive
	voltage on pin 2 with respect to pin 3
Power	11–52 V DC[4] phantom power (IEC-61938)
Requirements	2.4 mA, maximum
Net Weight	145 g (5.1 oz.)

[1]1 Pa=94 dB SPL

[2]THD of microphone preamplifier when applied input signal level is equivalent to cartridge output at specified SPL

[3]S/N ratio is the difference between 94 dB SPL and equivalent SPL of self noise, A-weighted

[4]All specifications measured with a 48 Vdc phantom power supply. The microphone operates at lower voltages, but with slightly decreased headroom and sensitivity.

Accessories and Parts

Furnished Accessories

Mic Clip	A57F
Zippered Carrying Case	A181C
Windscreen	A181WS

Optional Accessories

Cardioid Capsule	RPM181/C
Supercardioid Capsule	RPM181/S
Bidirectional Capsule	RPM181/BI
Omnidirectional Capsule	RPM181/O
Beta 181 Preamp	RPM181/PRE
Universal Microphone Mount	A75M
7.6 m (25 ft.) Cable	C25E

CERTIFICATION

Eligible to bear CE Marking. Conforms to European EMC Directive 2004/108/ EC. Meets Harmonized Standards EN55103-1:1996 and EN55103-2:1996, for residential (E1) and light industrial (E2) environments.

The Declaration of Conformity can be obtained from:

Authorized European representative: Shure Europe GmbH

Headquarters Europe, Middle East & Africa Department: EMEA Approval Wannenacker Str. 28

D-74078 Heilbronn, Germany Phone: +49 7131 72 14 0 Fax: +49 7131 72 14 14 Email: EMEAsupport@shure.de

Note: Information in this guide is subject to change without notice. For the additional information about this product, please visit www.shure.com.

124,46 mm

(4.90 in.)

20,32 mm	34,54 mm
(0.80 in.)	(1.36 in.)