Speaker Phase    When you have more than one speaker, the speakers interact with each other to create a sound field. Sound designers/mixers have the ability to place sounds in various locations within the sound field since they understand the relationship between each speaker. In order for your speakers to faithfully reproduce the sound field, your speakers must all be wired the same way (or in-phase). All negative (-) outputs from the receiver should be connected to the same color (-) input post on each speaker and all positive (+) outputs should be connected to the same color (+) input post on each speaker. If your speakers are out-of-phase with each other, the overall sound will lack the fullness that in-phase speakers reproduce, and you will not hear what the sound designer/mixer intended. Even if only one speaker is wired the opposite way, the sound image will not be correct. Sounds can be mixed between channels so that they appear centered between the channels or dispersed in nature. If an effect is to sound centered between two channels, an identical level of sound will be directed to each of the two channels desired "in-phase" with each other. The same signal but "out-of-phase" with each other will produce a wide and dispersed sound image. Improper speaker wiring can produce an out-of-phase image by reversing the two wires that feed the speaker. Proper speaker phase is not only important for the front left and right channels, but the center and surround channels as well. During each Phase Test, the two speakers indicated on the still graphic will emit test tones that alternate being in-phase and out-of-phase. By observing the sound image that is produced by each speaker test sequence, you will be able to determine if your speakers are correctly wired. Listen to these tests by positioning yourself centered between the speakers under test. "In-Phase" will produce a sound image centered between the channels under test while "Out-of-Phase" will produce a sound image that is wide and dispersed and difficult to localize. If you hear an out-of-phase sound image when the image is supposed to be in-phase, and vice versa, turn off your audio amplifier. Next, reverse the wires that feed the speaker highlighted with a red box in the still graphic. Once this correction is made, verify that the correct sound images are now being reproduced, and then proceed to the next test. Note: This test is most effective for 5.1-channel systems only. If your audio system has only two channels, you may reference the left and right front test only.		音箱相位       一只以上的音箱创建音场的时候，每个音箱之间都相互影响。混音师理解每个音箱之间的关系，所以可以把声音放置在音场中的不同位置。为了正确回放声场，每个音箱接线要一致，也就接线相位相同。功放的每个正极输出端(+)都应按颜色接到相应音箱的正极(+)接线柱上，每个负极输出端(-)都应按颜色接到相应音箱的负极(-)接线柱上。如果相位接错，整个声场的完整性就被破坏了。甚至一个音箱接错，声像就不对了，你听到的就不在是混音师要表现的效果了。 两个声道之间的相同信号不同相位的混音，可以有不同的效果。如果两个声道的相位相同，声音会集中在两个声道中间；如果相位相反，声音会变的十分宽广并扩散到周围环境中。如果音箱的两个接线接反了就会这样。适当的不仅对前左和前右音箱很重要，对中置和环绕音箱也同样重要。 测试时，两只音箱对应屏幕上的提示交替发出同相和反相的信号。在被测的一对音箱中间的聆听可以判断连线是否正确。同相（In-Phase）的声像集中在两只音箱中间，而在反相（Out-of-Phase）的声像宽广扩散并难于定位。如果屏幕上提示反相（Out-of-Phase）时出现同相（In-Phase）的声像，或屏幕上提示同相（In-Phase）时出现反相（Out-of-Phase）的声像，那就接错了。把屏幕上显红色的音箱的两根连线对调连接，再次试听，以确认相位是否正确并继续进行另外两对音箱的测试。 注意：这个测试主要针对5.1声道系统。双声道测试时只要参考左右声道的测试就可以了。     m17design.myetang.com m17译自www.thx.com 2002/01
	Next | Previous | Selections Back to THX Consumer Products

Privacy Policy | Terms of Use    © 2002 Lucasfilm Ltd.