我參考手邊的ROTEL RSP960AX,其背後超低音輸出是80/120/FLAT(全頻段),所以我猜LFE是指超低音由一個類似前項可選的低频輸出(LFE,Low Frequency Effects)接受信號,供參。
補充: 5.1-channel audio consists of five discrete, full range main channels (Left, Center,Right, Left Surround, and Right Surround) plus an optional band-limited LowFrequency Effects (LFE) channel. In contrast to the main channels, the LFE channel delivers bass-only information(<120 Hz) and has no direct effect on the perceived directionality of the reproduced soundtrack. 5.1声道音频由五个离散的全音域主声道(左,中,右,左,右环绕声)和一个可选的带限低频效应(LFE)声道组成。与主要的声道相比,LFE声道只传送低音信息<120hz),对复制原声的方向性没有直接影响。(用「有道」翻的)
再補充: The difference between the LFE channel and the subwoofer output is that the LFE channel is used to carry additional bass information in the Dolby Digital program while the subwoofer output represents how some or all of the bass information will be reproduced. 所以LFE是杜比餵給超低音的訊號,而主系統可選擇保留或切割LFE的發音範圍(即主系統要不要重疊發音 )