Рет қаралды 3,553
Comb filtering, an imbalance in a tonal balance or "frequency response", is clearly audible when two speakers reproducing the same signal differ in distance, sometimes by as little as 1 inch. Therefore pros and commercial cinemas use only ONE center ch. speaker even though using two can potentially place the center phantom image in the middle of a non-AT [acoustically transparent] screen. Instead the principle called the" image proximity illusion", aka "the ventriloquism effect", should cover most situations when mounting one speaker below or above the screen: listeners usually perceptually fuse the acoustic image to the visual image their eyes see even if they are separated by up to about 10-15 degrees, or so. [It can vary by listener and of course the smaller the better.]