The AKG HC644 MD is a high-performance head-worn microphone, perfect for a wide range of users from corporate speakers to aerobics instructors. From the Manufacturer: Following up on the legendary performance of the C544 and C555, AKG has created the next generation of head-worn microphone, the new HC644 MD. This high-performance head-worn condenser microphone is the perfect tool for presenters in the corporate market but also ideal for sport applications like aerobics. More and more wireless systems in the low to mid-price range are based on 2.4 GHz technology causing nasty interference with microphones. The new HC644 MD is well protected against those problems. The main improvements of the new version are a smaller capsule design with a higher sensitivity, an exceptional RF shielding, a sweat-resistant design and the ability to fit to all major wireless systems on the market. Features: STUDIO-QUALITY SOUND: Flat frequency response for natural sound HIGH RF REJECTION: For safe performance even in RF sensitive environment HIGHLY MOISTURE-RESISTANT DESIGN: Reliable operation even in extensive use UNIFORM POLAR PATTERN: Reduces feedback MICRODOT ADAPTER: Available adapters for most wireless systems Specifications: Type: Back-electret condenser Polar Pattern: Cardioid Sensitivity (1m): 20 mV/Pa (9V/18kOhms) Audio frequency bandwidth: 100 - 15000 Hz (+/-3dB) Electrical impedance: 200 Ohms Recommended load impedance: 2000 Ohms Equivalent noise level: 34 dBA Signal to Noise (1Pa): 60 dBA Max. SPL for 1 % THD: 135 dB Temperature range: -20°C to +60°C (14°F - 140°F) Dimensions Length: 200 mm Width: 130 mm Height: 35 mm Net Weight: 30 g (including cable) Audio Output Connector: 2-pin Microdot Powering Interface Operation voltage: 9V (2V - 10V) Recommended serial impedance: 18kOhms (2kOhms - 18kOhms) Current Consumption: ≤ 500μA RL=2.2Kohms Vs=2.0VDC Application Sports / Fitness Assisted Listening Sound Reinforcement Presentation Retail Device: Headset Microphone
