The AKG C520 Head-Worn Microphone With Adjustable Headband, Phantom Powered. High quality head-worn condenser microphone with maximum dynamic range for a perfect vocal sound.
The AKG C520 is an ideal choice for frontmen, singing keyboardists, drummers, guitarists, and dancers. The microphone arm mounts either on the left or right side of the headband as desired. Its cardioid polar pattern effectively rejects unwanted ambient noise. The C 520 provides the perfect solution for any performer needing a handsfree microphone. A transducer shock mount reduces handling noise to a minimum. The moisture shield prevents perspiration from penetrating into the transducer element, ensuring a high degree of humidity protection for the microphone. The C 520 is a condenser microphone and therefore needs a power supply. It can be powered with external 9 to 52 V universal phantom power. This version includes a useful switchable bass rolloff (-4 dB at 100 Hz) on the XLR connector body.
The main features of the AKG C520 include:
Head-worn microphone with continuously adjustable behind-the-neck headband
For 9 to 52 V universal phantom power
Includes an AKG W 44 Windscreen and a 10-ft. (3-m) plug-in connecting cable with phantom power adapter with integrated 3-pin XLR connector and switchable bass rolloff (-4 dB at 100 Hz)
External shock mount for high mechanical-noise rejection
Miniature gooseneck for precise positioning near the user's mouth
Microphone arm provides choice of left or right-hand use
Type: Pre-polarized condenser microphone
Polar pattern: Cardioid
Frequency range: 20 Hz to 20 kHz
Sensitivity: 7 mV/Pa (-43 dBV re 1 V/Pa)
Max. SPL: 126 dB/130 dB (for THD = 1 %/3 %)
Equivalent noise level: 33 dB-A
Supply voltage: C 520: 9 to 52 V universal phantom power
Impedance: 200 ohms
Recommended load impedance: >= 2000 ohms
Current consumption: approx. 2 mA
Cable length/Connector: C 520: 3 m (10 ft.) / 3-pin male XLR
Finish: Matte black
Size: 130 mm (5.2 in.) in dia.
Net/shipping weight: C 520: 30 g/540 g (1.1/19.1 oz.)
Sennheiser HSP 2-EW-3 Headmic Microphone 
Shure MX153T O-TQG
Shure WH 20 XLR Headset dynamic Microphone