The Countryman M4HP5RF18E Isomax 4RF Hypercardioid Gooseneck Microphone is a professional installed-sound microphone engineered for maximum gain-before-feedback and superior rejection of ambient noise in challenging acoustical environments. It employs a hypercardioid condenser capsule, which provides an even tighter and more focused pickup pattern than a standard cardioid, offering excellent rejection of sound from the sides and significant attenuation from the rear. This makes it exceptionally effective at isolating a speaker's voice in reverberant rooms or on noisy stages. Furthermore, it incorporates Countryman's proprietary 4RF (4th Order RF Filtered) technology, which provides outstanding immunity to radio frequency interference, ensuring a clean audio signal free from buzzing or crackling caused by nearby wireless devices.

The microphone is mounted on a durable, adjustable gooseneck, allowing for precise positioning to suit individual speakers at a lectern or conference table. The gooseneck is designed to hold its position securely once set. This model comes with an 18-foot permanently attached cable, offering substantial length for flexible installation, and terminates in a standard XLR connector for direct connection to mixers, DSPs, or amplifiers. Its robust construction is built to withstand the demands of daily use in high-traffic installed sound applications such as courtrooms, council chambers, theaters, and houses of worship.

The Isomax 4RF Hypercardioid model is the go-to choice for applications where achieving the highest possible gain before feedback is critical. The combination of its extremely directional polar pattern and advanced RF filtering tackles both acoustic and electronic interference. It delivers exceptionally clear and intelligible speech reproduction, allowing the presenter's voice to be amplified clearly above room noise and potential feedback. This microphone represents a top-tier solution for sound system designers who need a reliable, high-performance gooseneck microphone for the most demanding fixed installation speech reinforcement scenarios.