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
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 |
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| 4 | ||
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| D+ | RED | 2 |
| G |
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| BLK |
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| S |
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| SHIELD |
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MICROPHONE WIRING DIAGRAM
FIGURE 2
SPECIFICATIONS | WL93 MICROPHONE (with standard test circuit | SM93 MICROPHONE (with preamplifier) | |
| shown in Figure 3) |
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Type | Condenser (electret bias) |
| Condenser (electret bias) |
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Frequency Response (Figure 4) | 50 to 20,000 Hz |
| 80 to 20,000 Hz, 12 dB/octave rolloff below 100 Hz |
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Polar Pattern | Omnidirectional, uniform with frequency | Omnidirectional, uniform with frequency | |
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Output Impedance | 3000 Ω |
| Rated at 150 Ω (90 Ω actual) |
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| Recommended minimum load impedance: 800 Ω (May be |
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| used with loads as low as 150 Ω with reduced clipping level) |
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Output Level | Open Circuit Voltage: |
| Open Circuit Voltage: |
(1 Pascal = 94 dB SPL) | (13 mV) |
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Output Clipping Level | 0.25 V at 120 dB |
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(at 1,000 Hz) |
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Total Harmonic Distortion | Less than 1% at 120 dB |
| Less than 1% at 120 dB |
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Maximum SPL | 120 dB |
| 120 dB |
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Dynamic Range (maximum SPL to | 102 dB |
| 98 dB |
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Output Noise (equivalent SPL) | 18 dB typical, |
| 22 dB typical, |
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| 26 dB, weighted per DIN 45 405 |
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Hum Pickup (electromagnetic) | N/A |
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76 dB at 94 dB SPL (IEC 651) |
| 72 dB at 94 dB SPL (IEC 651) | |
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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 |
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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 | |
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| application |
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Current Drain | 40 mA typical |
| 0.33 mA |
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Environmental Conditions | Operating Temperatures: | Operating Temperatures: | |
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| (0o to 135o F) | Storage |
| Storage Temperatures: |
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Cable | Black 1.27 m (4.17 ft), attached, | Black 1.27 m (4.17 ft), attached, | |
| shielded, terminated by miniature connector type | terminated by miniature connector type (TA4F) | |
| TA4F (WL93T: Tan 1.27 m [4.17 ft]) |
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Case | Microphone: Black ABS thermoplastic case with | Microphone: Black ABS thermoplastic case with | |
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| Preamplifier: Steel case with |
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Net Weight | Microphone: 16 g (0.57 oz) |
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| Microphone:16 g (0.57 oz) |
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| Preamplifier:118 g (4.17 oz) |
*Produces positive voltage at pin 2 of Shure L4/EC4 wireless receiver
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