Earthworks TC20 High SPL Omnidirectional Condenser MicrophoneTC20: Omni Microphone 10HZ TO 20KHZ (Mic clip and case included) The TC Series (Time Coherent) is designed for recording louder sources such as drums, percussion, amplified instruments and loud sound effects. Microphones in this series allow recording of louder acoustic sources without overloading the preamplifier. Models in the TC Series are often the choice for recording drum overheads, close miked or amplified instruments and sound effects.