Oppositely phased paired resonators short-circuit radiation and raise Q to 70

Evidence

For oppositely phased resonators, acoustic short-circuiting takes place. Sound is radiated much more slowly, and as a consequence the decay of the sound takes longer. The out-of-phase case, with one resonator almost canceling the amplitude of the other far away (dipole source), has a much lower rate of energy loss and a measured Q of 70. Theory more detailed than we can go into here shows that Q increases as one over the distance squared between the resonators in the oppositely phased case. — Eric J. Heller, Why You Hear What You Hear- An…, 1235

Categorization

• XREF: Same logic as phased-array / dipole canceling used in loudspeakers and noise cancellation; also why two in-phase subwoofers couple differently than out-of-phase ones.
• QUESTION: Worth chasing: how acoustic short-circuiting relates to the near-field/virtual-size constraints on bass speakers, and which real room layouts inadvertently exploit or suffer it.