Shure WL93 manual Powering the SM93 Preamplifier, SM93 Preamplifier Impedance, Specifications

POWERING THE SM93 PREAMPLIFIER

Power the preamplifier supplied with the SM93 using any phantom supply providing 11 to 52 Vdc, such as the Shure Model PS1A Power Supply.

SM93 PREAMPLIFIER IMPEDANCE

Use a minimum load impedance of 800 Ω or greater for maximum signal handling and minimum distortion. Load as low as 150 Ω can be used, but a reduction in output clipping level will result. Note that the power supply itself may add loading (3300 Ω in the Shure PS1A) to the microphone.

USING OTHER PREAMPLIFIERS OR BODY-PACKS

If connecting the 93 microphone to anything OTHER than a Shure wireless body-pack or the preamplifier supplied with the SM93,

make sure it provides a regulated +5 Vdc source (40 μA minimum) at pin 2 of the microphone connector, as shown in Figure 2.

CONDENSER	IMPEDANCE		1	3
CARTRIDGE	CONVERTER
				4
		D+	RED	2
	G
			BLK
		S
			SHIELD

MICROPHONE WIRING DIAGRAM

FIGURE 2

SPECIFICATIONS	WL93 MICROPHONE (with standard test circuit		SM93 MICROPHONE (with preamplifier)
	shown in Figure 3)
Type	Condenser (electret bias)		Condenser (electret bias)
Frequency Response (Figure 4)	50 to 20,000 Hz		80 to 20,000 Hz, 12 dB/octave rolloff below 100 Hz
Polar Pattern	Omnidirectional, uniform with frequency		Omnidirectional, uniform with frequency
Output Impedance	3000 Ω		Rated at 150 Ω (90 Ω actual)
			Recommended minimum load impedance: 800 Ω (May be
			used with loads as low as 150 Ω with reduced clipping level)
Output Level	Open Circuit Voltage: –38 dBV/Pa		Open Circuit Voltage: –43 dBV/Pa (7.0 mV)
(1 Pascal = 94 dB SPL)	(13 mV)
Output Clipping Level	0.25 V at 120 dB		–18 dBV (0.13 V) minimum
(at 1,000 Hz)
Total Harmonic Distortion	Less than 1% at 120 dB		Less than 1% at 120 dB
Maximum SPL	120 dB		120 dB
Dynamic Range (maximum SPL to	102 dB		98 dB
A-weighted noise level)
Output Noise (equivalent SPL)	18 dB typical, A-weighted		22 dB typical, A-weighted
			26 dB, weighted per DIN 45 405
Hum Pickup (electromagnetic)	N/A		–4 dB equivalent SPL in a 1 mOe field (60 Hz)
Signal-to-Noise Ratio	76 dB at 94 dB SPL (IEC 651)		72 dB at 94 dB SPL (IEC 651)
Polarity	Positive pressure on microphone diaphragm		Positive pressure on microphone diaphragm produces
	produces positive voltage on pins 3 and 4 with respect		positive voltage on pin 2 relative to pin 3 of preamplifier
	to pin 1 (ground)*		output cable connector
Recommended Operating Voltage	2 to 10 V; 5 V nominal (pin 2 to pins 3 and 4)		11 to 52 Vdc phantom. Protected against reverse voltage
			application
Current Drain	40 mA typical		0.33 mA
Environmental Conditions	Operating Temperatures:	–18oto 57o C	Operating Temperatures: –18oto 57o C (0o to 135o F)
		(0o to 135o F)	Storage Temperatures:–29oto 74o C (-20oto 165o F)
	Storage Temperatures:	–29oto 74o C
		(–20oto 165o F)
Cable	Black 1.27 m (4.17 ft), attached, two-conductor,		Black 1.27 m (4.17 ft), attached, two-conductor, shielded,
	shielded, terminated by miniature connector type		terminated by miniature connector type (TA4F)
	TA4F (WL93T: Tan 1.27 m [4.17 ft])
Case	Microphone: Black ABS thermoplastic case with		Microphone: Black ABS thermoplastic case with
	stainless-steel-mesh grille		stainless-steel-mesh grille
			Preamplifier: Steel case with non-reflective black finish,
			black-chrome belt clip
Net Weight	Microphone: 16 g (0.57 oz)
			Microphone:16 g (0.57 oz)
			Preamplifier:118 g (4.17 oz)

*Produces positive voltage at pin 2 of Shure L4/EC4 wireless receiver three-pin connector.

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