問題是出在空間？還是喇叭？

http://www.linkwitzlab.com/rooms.htm
這篇很妙...以另一個觀點看空間vs喇叭，這也是他搞LX521的原因，

一開始提到最好的空間至少該有15英呎寬，20英呎長，8英呎高；
喇叭離牆至少3英呎，聆聽位置離背牆至少9英呎；
以我去過的上百個空間，符合這條件的，大概不到十家吧...

When a loudspeaker is placed in a room we hear both its direct sound, i.e. the sound which arrives via the shortest path, and the room sound due to the resonances, reverberation and reflections caused by the boundaries of the room and the objects in it. The two sounds superimpose and influence our perception of timbre, timing and spatial location of the virtual sound source. Thus, the off-axis radiation of the speaker has great influence on the naturalness of sound reproduction even when you listen on-axis and the more so, the further you sit away from the speaker.

這段提到喇叭擺在空間讓我們聽到的是直接音+間接音，因此喇叭離軸響應（非直接音）就很重要，這就是這篇的立論基礎，
也就是說，你的喇叭就擺在你家，一定會受到空間影響，那，有啥方法減少影響？
其一，在空間動手腳，
其二，在喇叭動手腳。

空間我們知道不容易搞，尤其是低頻；
那，喇叭呢？這篇就是在討論這件事。