Cardioid vs Condenser - What's the Difference? - Produce Like A Pro
Guideline to buy cardioid microphone – SYNCO
Difference between Cardioid and Supercardioid
MX Dynamic Mic Cardioid Vocal Multi-Purpose Microphone with XLR to 1/4″ Cable Ideal for Spoken-Word Presentations, Karaoke, Multimedia, Instrument, Home Or Portable Recording (HT-1012) – MX MDR TECHNOLOGIES LIMITED