每當我在混音時音量都不喜歡開太大,但是我的老師卻說音量一定要開到一個程度才行,不然出來的聲音是不正確的,但是那種音量對我來說可能太大,請問為什麼一定要開那麼大聲才能出來正確的聲音,難道不能小聲的混音嗎?謝謝.
這解釋起來有點麻煩.... the answer is "Yes and NO ".... Mixing的過程有許多不同的事要注意,,,有些"大聲"比較好check,如細微雜音.....,有些則需要用不同的音量去check.如frequency balance... 又比如說LF低頻音色比高頻音色需要"E" energy or let's say "Power" 去推才容易完整音色的全貌..... 太小聲mix有可能會miss mid low frequency 的 dynamic flow.. 但長時間太大聲mix也有缺點,,,,聽覺容易疲乏而導致處理手法的失焦,, music balancing 會因為終端的發聲系統不同而有不同的dynamic performance.......... mixing 本來就是該大聲小聲來來回回的 checking.. 不過話說回來......... mixing的目地是mix 完好聽 !!而不是怎麼樣去mixing.... 只要mix的好聽,,,即便你只看錶頭mix or 帶個耳塞mix... 不管你老師是誰,,都沒道理說你錯..... 我倒好奇你老師是怎樣解釋.."音量一定要開到一個程度 才行,不然出來的聲音是不正確的"... 聲音不正確??聲音如何不正確???只有機器或喇叭會不正確,,,聲音只是空氣中的流動,,沒啥正不正確,只有好不好聽吧!!!
非常謝謝您的解答,我的老師說的解釋我現在不是能完全記得,可能是我表達的不恰當造成Mr72不解我老師的意思,但我還有一個疑問請問如何知道現在聽到的音量已能推出完整的音色,是像megavv說的85db,還是不同的設備就不一樣,謝謝.
Mixing時常常轉一下音量,,大聲聽聽小聲聽聽不就是這個目的嗎??? 我不瞭megavv說的85dB 是設那個ref testing,,如何得到85dB的測量值,用啥測量?測量啥source ?,,,,,..anyway..,I have no comment on that.. However,,任何數據的引用若沒標出相對或絕對的testing條件,,,其實一點科學意義也沒有,,特別是像dB這類log 值... 比如說85dB是指sound intensity or sound pressure ? 85 dB on Full bandwidth or any particular frequency ?.....etc Human hearing 的dynamic range 從'Threshold of hearing"到"threshold of Pain" 是10的13次方,,,, 也就是說,,threshold of hearing 若是0 dB,,那pain of threshold 就是130 dB...... 我不確定各位討論的dB是eletrical, acoustic or any other power ratio...... 但我不覺得這些事跟 music mixing 這事有太大的關悉... 倒是請各位打"dB"時,把"B"大寫,,,,decibel的B大寫是對Alexander Graham Bell的尊敬 ,,, 沒有一種方法可以保證mix完一定屌.... 至少我個人沒有這種絕招... 不客氣的說句閒話...... 真正會mix的都沒幾個了..竟然有能教人mix的老師哩.... 敢問是那位大師???Mix過啥了不起的大作??
Megavv的觀念可能有問題喔~ 你可能是混淆了喇叭效率的意思了 喇叭的效率測量是: 以1kHz的訊號經擴大機以1W的功率推動喇叭 在喇叭正前方1m處測量聲壓等級(dB) 大部分紙盆喇叭的效率都在84~90dB左右 僅代表該喇叭容不容易被擴大機推動 如果以20Hz~20kHz(or white-noize)取代上述的訊號 可以取得這顆喇叭的標準"頻率響應圖"等... 以此可以比較各喇叭的頻率響應範圍,和是否平坦等特性... 假設一顆喇叭 效率85dB,響應頻率50~18000Hz (+-3) 當擴大機開到1W輸出在1m處產生85dB的聲壓等級 20~40Hz的音量還是比85dB小, 20~30Hz搞不好小到聽不出來 開的大小聲只是讓頻譜圖整體向上或向下移動而已, 這是物理特性 不是說開到多大聲就可以讓頻率響應趨於平坦,每個頻率都聽得清楚...
謝謝樓上的大哥指正,我指的85 dB 是Sound Pressure Level-SPL 是我錯了, 正確的來説,reference level is 85 dB SPL for pink noise, which is nothing to do with frequencies response and is not an indicator in anyway of being able to "hear all the frequencies". Only a spectrum analyzer can indicate that.
受教了~ 想多請教, 85dB pink noise 標準訊號在監聽環境的用途? 具我所知pink noise是經濾過傾斜, 低頻向高頻等斜率遞減的訊號, 並不像white noise一樣平坦, pink noise 的實際用途和原理究竟為何呢?
pink noise是比較接近人耳聽到,所有頻段都均等的一種訊號, 但高低頻音壓上的大小是不同的 ; white noise是物理上各頻段均等音壓的訊號 之所以會用pink noise去做reference, 就是因為是要給人聽的, 要聽的舒服各頻段都清楚; 不過人聽到的也許對阿狗阿貓可能是很痛苦的就是了 我是沒聽過什麼85dB的事, 只知道每人耳力不同, 而且混音時要一直切來切去一直試就是, 而且這85dB是叫大喇叭小喇叭都要發這麼大才對?還是很大的錄音室跟小的不得了的錄音室裡面的監聽都要發這麼大聲哩?
"The purpose of calibration is to adjust the overall electro-acoustic system gain so that 0dBVU of electrical signal level equals a certain acoustic level at the listening position. Since most recording media is now digital, the reference electrical signal level is usually –20dBFS with 20dB of headroom. The reference SPL level however can vary based on the delivery media and speaker type." ----------From Blue Sky http://www.abluesky.com/p_s_gb/p5s10.html For most of stereo setup, the Dolby referennce standard 85 dB SPL on C Weighted/Slow Scale is the common calibration level. The 85 dB SPL reference standard proposed by Dolby's Ioan Allen in the mid-70's, originally calibrated to a level of 0 VU for use with analog magnetic film. In 1983's AES convention, Bob Katz invited Tomlinson Holman of Lucasfilm and engineers from Dolby had an testament to the effectiveness of the 85 dB SPL reference standard. After the convention, the choice of 85 dB SPL has stood the test of time, as it permits wide dynamic range recordings with little or no perceived system noise when recording to magnetic film or 20-bit digital. Dialogue, music and effects fall into a natural perspective with an excellent signal-to-noise ratio and headroom. However, you can set the reference SPL to whatever you want and depending on the range of the level trims on the equipment and other factors like your speakers and room layout, you can achieve that reference SPL practically anywhere on the equipment - but again 0dB is the common practice and is what we all use so we can compare apples to apples when discussing levels. If you want, you could choose -10 as your reference volume setting and 75dB as the reference SPL level, but then its hard to compare to others that follow the common practice.
As far as I could recall,85dB(A) SPL is common ref for UK's union start to force members wearing hearing protector if they need to work under this SPL for long time.. ,,,,Generally,C weighted is more acurate in LF noise measuing than A weighted filter,,...however,Most weighted filter is mostly use for testing equipments' performance ,but not a general ref for "Human hearing".. Non-linearity in a sound system produces unwanted harmonic and intermodulation distortion, and perfect linearity is the "ideal"..... But for the ear, non-linear behavior is far from being a flaw; in fact it is a critical feature that enables the large dynamic range of human hearing..... The inner hair cells ,,,,"IHC".. of the cochlea, which convert sound to nerve impulses, have a range of less than 50 dB... But we can hear over a 120 dB dynamic range! It turns out that the ears have a built-in sound level compression system,... created by the outer hair cells ..."OHC" of the cochlea. ,,,,,In the most active region of the cochlea basilar membrane, a "4 dB" increase in sound pressure at the eardrum increases the membrane motion as little as "1" dB, due to mechanical action of the OHC. The non-linearity of the ear has been known over a century, but it was relatively recent that the OHC of the cochlea were identified as the primary cause.... The middle ear is quite linear over sound pressures of 40 to 110 dB SPL, and does not result in noticeable distortion at normal listening levels .... The inner ear non-linearity does produce distortion, which can be heard, and measured in the ear canal. In fact, the measurement of distortion products in the ear canal is used as a hearing test for newborn infants, since the distortion products are absent for certain forms of hearing impairment.... Since the major concerned issue on this discuss is the "Level" for mixing....I don't reckon there is a "Fixed" figure for every indivisual,,though it is even important to line up and aligning the mixing system correctly before doing the mixing jobs,... IMHO,,There is really no point to let a meter to tell if we are hearing loud enough... Sir George Martin retired at age of 72 due to hearing fail... however,his last ten years in career he still worked greatly with one ear hearing ability.and making lovely records.....