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What is a Cardioid Microphone? | Chris's Sound Lab
Cardioid mic: Guide to definition, characteristics, placement, and use – SYNCO
What are Cardioid Microphones?
Manley Reference Cardioid Tube Microphone — Manley Laboratories, Inc.
How to read a polar pattern chart - SoundGuys
What is the axis of the cardioid pattern of a condenser microphone? - Sound Design Stack Exchange
Guideline to buy cardioid microphone – SYNCO
Amazon.com: Amcrest USB Microphone for Voice Recordings, Podcasts, Gaming, Online Conferences, Live Streaming, Cardioid Microphone with Pop-Filter, Shock Mount, Adjustable Heavy Metal Stand, AM430-PS : Electronics