Loudness isn't too important - timing is. Even with the 4-block-away mic being on a direct line of sight, and the half-block-away mic being around a corner, the

Loudness isn't too important - timing is. Even with the 4-block-away mic being on a direct line of sight, and the half-block-away mic being around a corner, the half-block-away mic will perceive the event .5s or more before the 4-block away mic does.