因為Marshall MG 15 CDR就只有三個插口
Input/CD IN & EMULATED LINE OUT/EMULATED HEADPHONE
Input不用說了~一般來講是插這個，過音箱的前級調EQ修Tone
CD In就是以前我常拿CD隨身聽或MP3從這裡輸入這樣音箱也有CD歌曲的聲音，練習好用
Headphone就是耳機孔這個不用說了，夜晚練琴時一定得捅的啦。
But......
我真的很好奇和CD In用同一個插口的EMULATED LINE OUT是什麼意思
照字面上來看應該是"模擬輸出"…但是CD In本身就是類似於音箱的Sent功能了吧？？
那等於信號是流入的，那"模擬輸出"應該是信號流是流出的吧？？我搞不懂，翻了一下原文的手冊
用了Google翻譯但是還是看不太懂關於EMULATED LINE OUT的敘述。
以下先貼原文及譯文(我有修編)
CD IN & EMULATED LINE OUT
The MG15s cleverly combine the Line Out and CD input functions.
If you want to Jam to your favourite CD or tape, merely connect the headphone output of your CD or tape player here, adjust the CD/TAPE player's volume to match that of your guitar and 'hey-presto' - you've got the perfect 'Play-Along' practice system. Alternatively, you can use this socket to connect the MG15 to your multi-track recording machine and you'll get a great speaker emulated guitar sound direct to disk or tape.
HELPFUL HINT:for 'silent' recording merely plug an unconnected jack plug into the headphone socket and you'll disconnect the MG15's internal speaker.
當然不會搞壞 Input 1M歐姆很正常 吉他是高輸入阻抗的東西