For this stereo miking technique, you’re going to want to use two mics that are matched or very closely matched in regard to polar and frequency response. Many people use cardioids for this technique but super- and hypercardioids can also be used! (Both our KU5A and KU4 are supercardioids.) To determine the angle at which the mics are positioned, you’re going to want to consider a few factors: distance from the sound source, the width of the sound source, and the polar patterns of the mics you’re using. Typically, super- and hypercardioids are angled 90-135° from each other, however, there’s plenty of room for experimentation! In Wes Dooley and Ron Streicher’s paper “Basic Stereo Microphone Perspectives”, they note that using super- or hypercardioids is a good compromise between using two Figure-8 mics in Blumlein and using two cardioids in XY due to the small reverse polarity lobes found in their polar patterns. This means if you’re recording a live performance, you can still catch some of the audience reaction without it being too overwhelming and battling the actual sound source for space in the mix.