|  | BETA
53/WBH53 | BETA
54/WBH54 | 
| Specification | Wired | Wireless | Wired | Wireless | 
| Type | Condenser (electret
bias) | Condenser (electret
bias) | 
| Frequency
Response | 20Hz to
20KHz | 50Hz to
20KHz | 
|  | 
| Polar Pattern | Omnidirectional | Supercardioid | 
| Output Noise (equivalent dBSPL, A-weighted)
 | 39.0 dB typical;
42.0 dB maximum | 39.0 dB typical;
42.0 dB maximum | 
| Signal-to-Noise
Ratio | 55 dB at 94 dB
SPL | 55.0 dB at 94
dBSPL | 
| Recommended Minimum Input Impedance
 | >1 kilohm | 20 kilohms | >1 kilohm | 20 kilohms | 
| Preamp Output
Impedance | 136 ohms |  | 136 ohms |  | 
| Output Level, open circuit,
ref. 1v/Pa at 1 kHz
 | -50.0 +/- 3.0dB 3.16mV
 | -54.0 +/- 3.0dB 2.0mV
 | -52.0 +/- 3.0dB 2.51mV
 | -56.0 +/- 3.0dB 1.58mV
 | 
| Maximum Sound Pressure
Level | 147 dBSPL at 1% THD/1 kilohm
load | 142 dBSPL at 1% THD/20 kilohm
load | 149 dBSPL at 1% THD/1 kilohm
load | 144 dBSPL at 1% THD/20 kilohm
load | 
| Dynamic Range | 108 dB (max. SPL with 1k load,
minus typical A-wt. noise)
 | 103 dB (max. SPL with 20k
load, minus typical A-wt. noise)
 | 110 dB (max. SPL with 1k load,
minus typical A-wt. noise)
 | 105 dB (max. SPL with 20k
load, minus typical A-wt. noise)
 | 
| Current Drain | 4.6 mA (preamp and
microphone) | 60-130 microA (microphone
only) | 4.6 mA (preamp and
microphone) | 60-130 microA (microphone
only) | 
| Output Polarity Positive pressure on the
 diaphragm produces a positive
 voltage at:
 | Pin 2 relative to pin 3 at the
output connector of the preamp
 | Pin 3 (black lead) relative to
pin 1 (shield lead) at the output connector
 of the microphone
 | Pin 2 relative to pin 3 at the
output connector of the preamp
 | Pin 3 (black lead) relative to
pin 1 (shield lead) at the output connector
 of the microphone
 | 
| Power
Requirements | Phantom power; 11 to 52 Vdc
positive on pins 2 and 3, return on pin 1 (ground)
 | +5 Vdc on pin 2, return on pin 1
(ground) | Phantom power; 11 to 52 Vdc
positive on pins 2 and 3, return on pin 1 (ground)
 | +5 Vdc on pin 2, return on pin 1
(ground) | 
| Net Weight | 135.35 g (4.75 oz.) microphone and in-line preamp
 | 35.35 g (1.25 oz.) microphone only
 | 135.35 g (4.75 oz.) microphone and in-line preamp
 | 35.35 g (1.25 oz.) microphone only
 | 
| Cable | 1.5 m (5 ft.),
small-diameter, shielded, with mini 4-pin connector
(TA4F) |