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Sound Image Costs and Benefits, Part 2

Apr 4, 2013 1:38 PM, By Bob McCarthy

Practical sound system design for the best preservation of imaging.


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Figure 4: Section view of same theater system with L/R mains and centerfill. Colors same as Figure 1. (A) Frontfills delayed to fictitious stage source. (B) Lower main delayed to fictitious source. Upper main is then delayed to lower main at the balcony front. (C) Center can be delayed to meet L/R system. If center is late, then delay can be added to L/R mains to sync them to centerfill. (D) Underbalcony delays with favorable orientation to mains. See larger image.

Setting the Range

The final aspect of the image control scenarios is the range setting. This is done by equalizing the mains and subsystems to have a similar frequency response throughout the room, thereby minimizing the perceived range disparities. As we move to the most distant parts of the hall we can allow the response to tilt somewhat in favor of the lows, thereby letting the far seats move back enough to keep their range plausible.

Out of Time

In this two-part article we covered how we perceive sound image and how we can design sound systems to take practical advantage of speaker placement and timing for the best preservation of imaging. I hope this will be helpful to your designs and tunings.



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