The benefits of matched microphones are that a pair would perform exactly alike, thus making a stereo pair behave in a way that makes a very accurate stereo recording (that's just one example). ... Most manufacturers do not even offer “matched” pairs of mics anymore because of this.

What does a matched pair of microphones mean?

A "matched pair" is a set of two microphones that sound the same. ... Those specs are just a technical way to express that the two mics sound essentially identical. (Beware of companies that only match for sensitivity, or limit the frequency range matching to a few octaves in the middle of the audible range.)

Why did they tape two microphones together?

Using two mics for noise cancellation. Combining outputs of both at equal gains, but in opposite polarities, will cancel ambient noise from each to a certain degree. ... Both microphones must be able to hear the sound source directly.