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# Chapter 9Combination

## 9.1 Combined Speaker Variance Progressions

This chapter explores minimum-variance behavior beyond the single-speaker response. The combined response is the sum of its parts. Therefore, our study of the single-speaker shape was time well spent. Let’s begin with a simple question: What is the combined coverage angle of two speakers compared with one? The answer is not so simple. The result can range from double to half of the individual element (Fig. 9.1). The decisive factor is the ratio of two opposing forces: overlap and isolation. These come in two forms: angular and displacement. We reduce overlap by isolating the

combination n. 1. combining; combined state; combined set of things or persons. 2. united action.

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