|
|
發表於 2013-11-7 11:56:46
|
顯示全部樓層
本帖最後由 auraheart 於 2013-11-7 17:20 編輯
封牛集團 發表於 2013-11-7 10:08
前級以前用黑膠碟嘅時代，系必須要嘅， 應為刻錄膠碟嘅時候， 考慮到刻線要幼細， 低音16 Hz， 高音18，000 ...
This is interesting.. "播放嘅時候加大縮小"..I always thought RIAA is pre-emphasis only on recording and de-emphasis only on playback. Example I can think of is on playback @ 7950 micro second (20hz) that is at 20db and starts to drop to zero DB at 1khz and continued dropping to -20db @20Khz. Recording is just the reverse process. In addition to greater recording time, it also would improve sound quality and reduce groove damage during playback. Decent phone pre-amp specs it from 20hz-20khz +- .2db. Typically from 30hz to 15khz is more/less matters. Never heard of a 16hz and 18khz thingy...maybe a new lesson to learn? 
Other than the RIAA equalization, the out put voltage (signal) of the cartridge is very low, usually just a few mil-volt, moving coils are even worst. A phone amp is required. The flat amp may or may not be needed depends on the gain of the phone amp. It is usually there for volume, tone, and other functions in addition to amplification. Cd direct to amp is just no feels, lack of dynamic headroom and don't sound good to me. |
|
樓主: 柒喜
在線雷達
發表於 2013-10-7 20:21:41
如著實說虛榮，電腦是虛榮、智能手機是虛榮、波鞋是虛榮、電視是虛榮、洗衣機是虛榮、看電影是虛榮，就連找小姐也是虛榮。我只是普通城市人，生活上充斥著虛榮，要不虛榮只有活在第三世界，只要活得開心，管他媽的虛榮不虛榮。
Of course, too much is not good, 好似大陸咁, hehe. Not as bad here though.
