Re: [心得] focusrite錄音介面的mic前級怎麼會這麼弱?
最近比較有空，稍微摸索測試了一下
我的型號是Pro 24 DSP
mic pre的強度的確有點偏弱
不做任何處理的話接上SM58錄Vocal時Gain都要開滿大的 (9-9.5)
目前我的解決方法是在內建效果裡的Comp可以調整output level
這邊拉高一點，訊號就可以輕鬆到達-0.3
而且因為我的是Pro 24 DSP，所以用內建效果時監聽不會delay
還有一個方法就是在DAW裡面調整
可以在DAW裡把錄音軌的音量Gain拉高
這招就算interface裡沒有內鍵dsp晶片也可以用
爬文發現一般都是推薦這作法
經過測試後這招的確是很ＯＫ的
現在對我來說最大的問題是
如果要接高阻抗耳機(數百歐姆)可能要另外買耳擴
不過目前只有這小缺憾，我目前的耳機K240s也快樂服役中
最多就以後挑耳機記得看一下阻抗
跟它的功能還有價格相比，這小缺憾讓我感覺就不是那麼重要了
※ 引述《haiaku (英倫時光)》之銘言：
: ※ 引述《ntuguy (ya)》之銘言：
: : 雖然說現在的錄音介面也堪用，但如果沒有重大問題
: : 我是很願意購買的
: : 但很奇怪的，有兩點真的讓我無法接受
: : (1)當我把電容mic插到Saffire PRO 14號稱獲獎的麥克風前級
: : 居然推不動，我把錄音介面的gain調到80%
: : 錄進cubase都還只有一點點訊號而已
: : 如果我把gain調到90%以上，似乎又有些雜訊了
: : 意味者我錄音時必須費力唱很大聲才能錄到足夠清楚的聲音
: : (2)他是用phone-jack接頭接到監聽喇叭
: : 送出的訊號比我現在用RCA接頭的弱了不少
: : 意味著我播音樂時要把volume的旋鈕開很大
: : 才可以有足夠大的播放效果。
: : 恩，新出產的機器，不是應該錄音放音更敏銳有power嗎?
: : 為什麼這台Saffire PRO 14使用起來會有上述的嚴重缺點呢?
: 第二點我沒試過，但他的耳擴是不太夠力的如果你要推高阻抗耳機(數百歐姆)
: 而且IMO，低頻有點太多
: 不過我的pro 24好像有同軸輸出，應該可以用這接speaker
: 同軸跟一般的phone jack的測試之後我有錢買監聽喇叭時會再測試看看
: 第一點的mic pre，我爬一些國外的review後發現
: 他的mic pre只有大概+55db左右
: 不過這樣的設計還是有處理方法
: 摘錄其中一段我覺得寫的很有道理的
: The thing is with digital recording,
: the level recorded to track doesn't really matter.
: In digital, boosting the level in the box,
: only boosts the level of what's been recorded,
: there's no tape hiss it's boosting as well,
: which was why it was so important to get a hot signal on tape.
: So the solution for me?
: Boost the gain to get the source signal as high as you can
: before you the self noise of the pres becomes significant.
: If you have to boost the headphone level,
: or boost the level via DAW, do it.
: Personally,
: I would prefer to be able to record a -3db signal,
: but if it means recording a noticeable level of noise.
: There's no technical reason why it would be bad
: to record with your signal peaking at -15 or -10,
: because you can just boost it in the DAW with no added noise.
: If you can keep your gain setting below 7 or so,
: the noise floor is much lower
: than anything else I have ever used in the same price range,
: and the quality of the audio is much more pleasing as well.
: 當然如果mic pre可以gain一點的話是更好啦...
: 不過這樣的設計應該也還在OK的範圍就是
: 另外這是Focusrite官網回應：
: The Saffire microphone preamps provide between +10dB and +55dB of gain to the
: input signal before the converters. The gain required to obtain an acceptable
: signal level will depend on several factors including the input source and
: the type of microphone.
: For example, signals with a high SPL like those from acoustic drums and
: guitar amplifiers aren't likely to require much amplification so it's normal
: to set the gain on the lower range. This is particularly true if a sensitive
: condenser microphone is utilised. Quiet signals such as vocals will requires
: more amplification, particularly if used with a dynamic microphone.
: The gain change by the potentiometer isn't linear and it's not unusual to
: require setting the gain towards the high extreme to get a reasonable signal
: level. The Saffire preamps are designed to sound good at both extremes of the
: gain scale as well as everywhere in between so setting the gain on its
: highest setting is not anything to be concerned about.
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