Dual-Diaphragm 1′′ True Condenser Mic 3 Selectable Polar Patterns -20 dB Pad Low-Cut Filter at 300 Hz Providing you with multiple recording patterns for demanding project studio applications, the Project Studio P420 Multi-Pattern Large-Diaphragm Condenser Microphone from AKG features a 1′′ dual-diaphragm construction optimized for use on a variety of sources including vocals, ensembles, grand piano, woodwind and brass instruments, and drums