Countryman ISOMAX 4RF Lectern Mic

Questions? Our experts can help!

The ISOMAX 4RF’s unique Active Vibration Isolation detects and subtracts vibration

from the signal while its tightly-controlled pickup pattern ensures voice quality

and reduces feedback.



Output Impedance:

270 Ohms balanced, transformerless.

Will drive any load impedance

without distortion at full rated SPL.

Overload Sound Level: 124 dB SPL at 1% THD
Power Requirements: 9 V to 50 V at 10 mA
Sensitivity: 5.0 mV/Pascal
Equivalent Acoustic Noise: 39 dBA SPL



What We Do

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What We Do - Service


We are determined to provide you with the absolute best customer service in our industry. You can reach us any hour of the day, any day of the year. We offer freight-free shipping in the continental U.S. and we bend over backwards to provide you with non-stop customer support. That’s how we roll.



We carry an extensive lineup of Pro AV subrental gear to power your entire event including audio, video, LED, lighting, computers, monitors, cameras, switchers… and all of the optional accessories that you need.



Looking to get technically trained on current technology? Come to one of our Technician Training Courses. Taught by industry experts, these hands-on training courses currently cover LED Walls, Advanced Projection, and Camera & Switching Fundamentals.

Quality Control

Quality Control

We are relentless about QC, and have set the standard in the industry. Every piece of gear is quality tested after every single rental, and no piece of gear is shipped from show to show. Ever.


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