![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgSY80lbu30mr_-_xtMF8R7FThscjvnfw7Ud4sutguRdU0H03drneaVW2iIZprQX0hi2QHcSUVavWblT57K_6zfk3OsOUDyW_8EcPjAt6Y3BslLxdE1GYzvSBWz675D_DAmIK4B8jYJb7A2/s400/Tape+dubber.jpg)
Over time this was replaced with a CD based system. The IMAX sound systems (by Sonics which IMAX purchased long ago) feature a full 10 octave dynamic range while even modern conventional systems are limited to 6 octaves.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBz3uHNPZ_yWNSFhXZFg7aW4uKG-PSmSlPX3HQYaWyNk50emXLuABgMMj0AtTByVriUSpKvEf8MtzJ0p6zwhc8CQnfcApKCDEsDje7I8yVwqAo_0KkdL4PSl6HaXUl1QDr7HgNgQ6YiAH0/s400/IMAX+Digital+Sound.jpg)
A classic IMAX theater uses 44 speakers and up to 36,000 watts to power the speakers. MPX theaters may be anywhere from minimally better than other theaters to a full blown IMAX system depending on the contracts and costs.
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