Modal frequency resonance is position-independent while coupling is position-dependent

Evidence

Now let us look at the denominator of Equation 14.2, which represents the modal resonance in frequency. For any given mode, as the frequency of a source approaches the modal frequency fn, the denominator gets smaller and thus the output reaches a peak. This will look something like what is shown in Figure 14.5. This resonance in frequency applies equally for all source and receiver positions. This is the beauty of our equation, it allows us to separately consider the spatial and frequency effects of real modes in real rooms. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1530

Categorization

• DEFINE: Clarifies the key separation in modal analysis: frequency resonance is universal to a mode, while source/receiver coupling varies with position.