The context behind the term ‘71 speakers’ is very unclear. It may constitute an advanced surround sound system placed in a highbrow concert hall, a home theater, or even a high-grade audio system in a stadium. Such arrangements would be engineered to providing the complete experience which in turn requires meticulous placement to guarantee that every frequency and every special zone would be properly covered. In this case, each individual speaker would require meticulous calibration. With effective audio signal processing technology, flawless sound at every frequency would be possible. Even then, very small context elements remain vague.