我係打手
2021-3-15 00:02:40
dac 個gain我估你想講dac headphone out個gain?
咁就要分清楚，一體機有3部份：
digital to analog -> pre amp -> headphone buffer
digital to analog 個output本身係冇得校gain, 得一檔gain，呢個亦係lineout
跟據我荒廢多年電路記憶，headphone buffer 個 voltage gain 係1（一般講校gain 係講voltage gain）
所以你實際係校緊 pre amp 個part 個voltage gain
重寫你個點題：amp 個gain點set好？
咁會問得準d，因為dac本身係唔要gain
有時會聽到部機唔同gain 會唔同聲, 發生呢個情況個時主要會見到：low gain 多d bass, high gain 少d bass, mid gain 介乎兩者之間。呢個現象gain bandwidth trade off：gain 愈大，frequency response 個有效範圍愈窄
:^(
如果部amp設計得好就唔會咁易聽得出唔同gain 會唔同聲，咁就點set都ok
gain bandwidth trade off之外，amp本身設計如果唔夠穩定，可能唔同gain之下個frequency response會變形，呢樣就要逐部amp睇