![]() The volume levels of the speakers may not be perfectly adjusted, the speaker-to-listener distances may be inaccurate, and the subwoofer volume may be too loud or too low. Autosetup is a great idea, but there's no guarantee you'll have a perfectly adjusted home theater sound after the test tones have run through all of their beeps, whooshes, and thumps. To accomplish these goals, the systems send test tones through all of the speakers and the subwoofer, and they all use a microphone to capture the sounds of the speakers. Some autosetup systems also employ equalization to balance the frequency response of all the speakers, and they try to minimize room acoustic problems. The systems handle the basics like determining the sizes of all the speakers, setting speaker and subwoofer volume levels and the speaker-subwoofer crossover point, measuring the distances from the speakers to the listener, and checking that all of the speaker cables are correctly hooked up. Just about every home theater receiver comes with an automatic speaker setup and calibration system: Denon, Marantz, and Onkyo feature Audyssey Pioneer has MCACC (multichannel acoustic calibration) Sony's is called DCAC (digital cinema auto calibration) and Yamaha's proprietary system goes by the name YPAO (Yamaha Parametric Room Acoustic Optimizer). ![]()
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