The FC 4 ST is a matched (within 1 dB!) stereo pair of two FC 4 microphones. Specs below. The FC 4 is a low cost, small capsule, true condenser microphone with transformerless discrete low noise class-A electronics. The 20 mm, 3 um gold-sputtered diaphragm has a cardioid shaped polar pattern and a great sensitivity. The characteristics of the FC 4 are ideal for many recording and live situations. It will catch the crispness of your favourite guitar, every detail of your acoustic piano, the complexity of a clean electric guitar, the raw power of distorted amps, etc. The Golden Age has equipped the FC 4 with high-pass filter and pad switches. This also makes it suitable for loud sounds and even vocal recording. Every musican and studio have use for a couple of FC 4´s. The small capsule cardioid condenser mic is one of the most basic mics for recording. The FC 4 is truly a great sounding and very versatile microphone at a very low price!