The Sennheiser EW 100 G4-945-S-A is a professional wireless vocal system configured as a complete handheld set, designed to deliver reliable, high-quality audio for vocalists and presenters in live sound and installed applications. Operating within the 516 to 558 MHz UHF frequency band (Band A), this system offers stable performance with strong resistance to interference, making it suitable for environments such as houses of worship, corporate events, and medium-sized performance venues. The set is centered on a durable handheld transmitter that integrates the Sennheiser MM 945 dynamic supercardioid microphone capsule, paired with a true-diversity receiver, offering an all-in-one, ready-to-deploy solution for critical vocal reinforcement where superior feedback rejection and focused pickup are required.

The handheld transmitter features a rugged metal body built to withstand frequent use and houses the interchangeable MM 945 supercardioid capsule. This microphone is specifically engineered for demanding vocal applications, delivering a detailed frequency response with a very tight pickup pattern that provides exceptional rejection of unwanted ambient noise and monitor feedback from the sides and rear. The receiver, available in either rackmount or compact portable formats, incorporates a user-friendly interface with a clear display for monitoring RF and audio levels. Essential features like automatic frequency scanning to locate an open channel and pilot tone-based squelch ensure straightforward setup and stable operation, protecting against interference from other wireless devices.

Engineered for seamless integration and professional audio results, the system utilizes Sennheiser's advanced companding technology to deliver transparent sound with a wide dynamic range and low noise. The receiver provides both balanced XLR and unbalanced 6.3 mm jack outputs for flexible connection to mixing consoles, powered speakers, or recording interfaces. Sold as a complete package with necessary accessories—including antennae, a power supply, and often a protective case—the EW 100 G4-945-S-A provides a dependable, out-of-the-box wireless solution. It is an ideal choice for performers and presenters in acoustically challenging or feedback-prone environments who seek the focused performance and superior rejection of a supercardioid pattern within the accessible and reliable Evolution Wireless 100 series.