在我心中校正效果排名(排完沒朋友了)
1. Trinnov
2. Accuphase
3. MiniDSP DDRC 22A
4. DRC(使用者不同,校正結果就不同)
5. Lyngdorf(因為不開放校正內容)
6. DEQX(太難用了,相信會用的人能搞出好聲音)
可列印查看
在我心中校正效果排名(排完沒朋友了)
1. Trinnov
2. Accuphase
3. MiniDSP DDRC 22A
4. DRC(使用者不同,校正結果就不同)
5. Lyngdorf(因為不開放校正內容)
6. DEQX(太難用了,相信會用的人能搞出好聲音)
空間測量不用教學啦,要精準,工具少不了,雷射水平儀、雷射測距等,麥克風擺得準,數據自然準。
把結果截圖上來大家討論建議就好。
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非常抱歉之前家中老小生病加上工作兩頭燒,沒時間上來貼文。
趁現在有個空擋先簡單回覆一下。
如小弟之前貼文所說,測量麥克風方向要怎麼擺,一直都有在討論。
簡單的說,會有這些問題,都是因為所有的無指向麥克風都不是真的無指向。
如果真的有無指向麥克風,那麼麥克風無論怎麼擺,都不會有差,也就不用討論了。
所以,麥克風無論怎麼擺,都有它的優缺點。就看每個廠商/人的觀念是什麼,和要測什麼東西而定。
(edit: 之前搞錯說話的人,趕快上來編輯改正...)
John Reekie 在hifizine上面寫過一篇關於測量麥克風的文章,裡面提到:
(原文在此: http://www.hifizine.com/2012/09/dayt...spectrum-labs/ )
"In-room measurements
With an in-room measurement, the direct signal from the loudspeaker is (typically) the loudest, but it is then followed by a long sequence of reflections coming from all directions. Since measurement mics are omnidirectional, they will pick up all of the reflections as well as the direct sound from the loudspeaker. There is, however, a fly in the ointment: the measurement microphone is not exactly omnidirectional. Compared to its on-axis response, a microphone has falling sensitivity as frequency and off-axis angles increase. This can be seen in the polar plot of the Dayton in Figure 2 above, where at 10 kHz, the microphone is down (compared to the on-axis response) about 4 dB at 90 degrees and about 6 dB at 180 degrees.
The Earthworks M30 has a smaller capsule (1/4 inch vs 1/2 inch on the Dayton) and so we might expect it to fall off less off-axis. This is analogous to loudspeakers – you generally expect a smaller tweeter to have better high-frequency Dispersion than a larger tweeter. Figure 5 shows the polar plot of the Earthworks M30 (a generic plot from the manual). At 10 kHz, at 90 degrees off-axis the microphone is about 2 dB down; and at 180 degrees, 4-5 dB down.
For in-room measurements, it seems that a good compromise is to use a calibration file for the microphone for 90 degrees off-axis, and point the microphone at the floor or ceiling. In this case, the in-room measurement consists of a) the direct signal from the speaker, which is corrected by using the 90-degree calibration file, and b) a long series of reflections coming from all directions, which we might assume to be averaged out over the polar response of the microphone. Note that at low frequencies, the microphones are truly omnidirectional, so it makes no difference which way you point it."
簡單的說,是麥克風朝向天空或是地板,然後使用90度的麥克風校正曲線。
文中也有Dayton EMM-6和earthworks M30的比較。
校正過後,基本上兩者在測量頻響上沒有太大差異,但是失真的差異就比較大。
而文中也有比較不同角度測量的差異,只要用對校正檔,差異並不明顯。
另外有個人叫做Herb Singleton,是Cross-Spectrum Labs的老闆。
Cross-Spectrum Labs就是kevintran兄所提,專門賣重新校正測量麥克風的公司,也是大量使用DRC的單位。
關於麥克風怎麼擺,他的意見如下:
(原文在此: http://www.hometheatershack.com/foru...tml#post146672 )
"Since the response of most measurement mics will depend on the orientation, what to do? Well, if you're trying to measure the freq response of a particular source, measure with the mic pointed at the source (which will minimize the effect of the mic body) and apply your calibration curve to correct the response. If you're doing a room measurement for DRC or other purposes (STC or RT60 measurements) what you really should be using a diffuse field microphone (which pretty much no one does) or you should measure at various locations with a free-field mic at various orientations (as recommended in ASTM E336), and then average the responses together. Of course most of us don't have the time and/or patience to do that, so when I do room measurements, I put the mic in random incidence position (mic facing the source and angled 70-80 degrees with respect to the floor)."
就是將麥克風稍微往喇叭方向傾斜10~20度,使用90度的麥克風校正曲線。
小弟再強調一次,由於沒有真正的無指向麥克風,所以麥克風怎麼擺都有優缺點。
各位可以依照自己比較認同的方式去測量,但請一定要使用正確的麥克風校正曲線。
ps. Dayton EMM-6 之前在parts-express特價USD40,而cross-spectrum lab校正過的,價格為USD75(基本校正) 和 USD90(高級校正)。
Earthworks M30的售價為 USD699。
小弟認為對於一般的空間測量,UMIK-1是足夠好而且最方便的選擇。
小弟自己目前用的麥克風是Dayton EMM-6,麥克風前級+ADDA是TASCAM US-366。
但就如小弟第一句所說,除非是大燒,要不然小弟覺得沒有必要買獨立的麥克風和麥克風前級。
至於REW,請讓小弟之後有時間再慢慢解釋。
去youtube找影片看大家測量的操作最快,與地面平行,很多工具才使得上力,水平儀、雷射定位等等擺設麥克風的東西才用得上,每次測量才會一樣位置。
這幾台機器的說明書也都有提及建議與耳同高並對準中間。
按理論也不是不行,每次測量都要仰角同一個角度大概就gg了。
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