单项选择题
Which of the following is the recommended placement of the rear surround speakers in a 5.1 surround installation？（）
A.Directly to the left and right and slightly in front of the listener B.Directly to the left and right and slightly behind the listener C.Above and behind the listener D.Directly behind the listener
单项选择题 Ifthespeakersinaninstallationareoutofphase，thismeansthat（）
单项选择题 WhichofthefollowingcablingwouldbeMOSTcommonlyusedwithdigitalvolumecontrols？（）
单项选择题 Whichofthefollowingisthecorrectsignalflowforananalogmulti-roomaudiosystem？（）
