Thermoacoustics

https://en.wikipedia.org/wiki/Thermoacoustics

Thermoacoustic effects can be observed when partly molten glass tubes are connected to glass vessels. Sometimes spontaneously a loud and monotone sound is produced. A similar effect is observed if a stainless steel tube is with one side at room temperature (293 K) and with the other side in contact with liquid helium at 4.2 K

Dub

https://youtu.be/7iCxjXZOYsU

The Wall -- Alok & Sevenn

https://youtu.be/Qs1IQAdp-60

雷射傳耳

https://futurism.com/the-byte/laser-beam-speech-mit?fbclid=IwAR145doPmLmPPAs2lFKqU3kpEUZenUG6ESmJjINLTfM5I-ECZUzURMCBt3U

Both techniques take advantage of something called the photoacoustic effect, which is the formation of sound waves as the result of a material absorbing light. In the case of the MIT research, that material was water vapor in the air. 

For one of their methods, the researchers “swept” a laser beam at the speed of sound, changing the length of the sweeps to encode different audible pitches.

後者就是以光modulate聲音。

籠裡的猴、香蕉、噴水與太平洋電纜

和老音響迷談到電源，都會提到太平洋電纜...
試問，太平洋的真的比較好？比誰的好？你真的比過？是誰比過？指的出來？該不會根本就沒這個人存在吧...
再問，到底好在哪？嘿...說不定根本就沒人知道...
說不定根本是個謠言...

正好拿這個著名的實驗當例證 https://www.thenewslens.com/article/87723
"五隻猴子和香蕉"的實驗，原來從未發生？

香港人

https://youtu.be/AUUzcB_ooN4

吾等樂迷 -- 台南湯湯

二十幾年來，台灣音響圈一直鼓吹喇叭和聆聽位置各踞房間兩端1/3處，而且喇叭要離牆面遠，這招有其道理，但效果可以好到啥程度？這招就夠了嗎？正好以湯湯這個例子來看看。

湯湯這房間是台南鄉下透天的三樓，擁西與南二面窗景，這般冬日暖陽下真是閒散舒適啊...
照片？老樣子，我沒拍，看主人家是否願意分享囉～
房間格局略近正方形，約4mx3.5m，喇叭與聆聽位置就照1/3位置擺，左右離牆面約近1m，這對Harbeth HL5喇叭間剩下不多，約1.5m；
聆聽位置與喇叭間也差不多1.5m，扣掉布沙發，其實喇叭前鋪著厚長毛地毯的空間還真不大，算來已經是盡量離牆面遠的大耳機聽法了；
這般照一般說法擺設出來的振幅頻率響應會如何？

來，先問，這張圖看來算好嗎？哪裡不好？