Reducing energy in a single problem mode lowers seat-to-seat response variance.

Evidence

What is needed is a way to reduce energy in the problem mode, shown in Figure 14.9(a), where there is a 10 dB range between the dotted lines. Let’s assume for a moment we have achieved this. What is the result? In Figure 14.9(b) we see what happens when the mode in question is reduced in level. The response for that mode at all seats is reduced, but the neighboring (unaffected) modes and room pressurization mode will tend to fill in the response for seats with the lowest amplitude. This is what makes modal manipulation work. This is why it helps to be able to control each mode separately to the extent possible. This is the basic mechanism for reducing seat-to-seat variance. — Toole, Floyd E, Sound reproduction- the acoustics and…, 1539

Categorization

• DEFINE: Explains the core mechanism by which modal manipulation reduces seat-to-seat variance.