Stereo花了多久才成為主流？

http://www.psaudio.com/pauls-posts/the-ways-we-think-of-amps/

Before the late 1960s stereo sound systems in the home were rare, typically cobbled together by hobbyists using twin mono amplifiers, preamplifiers and loudspeakers. Though stereophonic sound was invented in the 1930s, it would be another 40 years to gain household acceptance.

三十年哪...
不過呢，我要反問，爛音響搞二聲道幹嘛？聽的出音場？別鬧了...
何不集中火力在單聲道？

Paul說當年由mono轉stereo時，廠商樂啦～一套變二套，賺翻了～
如今呢？這個拼命壓價格的年代？
一套成本變二套啊...
反過來想，改做mono，二套成本變一套，不是很好？
所以呢，貓窩就是這麼做～