[測試] Please Educate me How to Read these...

seikomatic

What does the left db column mean? sensitivity?

What's the difference if it starts from 65 and 70?

ntony

你可以理解為，起唔同頻率嘅聲，起減去基本嘈音後，佢輸出嘅聲壓有幾大(有幾響)。(其他師兄如果見我有錯請指正)
如果你嘅要求係要佢忠實還原，就應該追求呢條線唔好起某段頻率插水或者跳高。例如圖一咁，佢2kHz至20kHz咪又上又落。尤其8.5kHz至20kHz呢段，差咗20-25個dB。咁佢嘅超高音就會無咁出。但佢20Hz - 2kHz都算幾平整，幾唔錯。

如果唔係講10kHz以上嘅高音，由2kHz - 10kHz如果潛咗落去，有時layman少少嘅人純粹講感覺就可能會話呢對耳塞暖聲，唔係清底。我見好多華人forum入面，通常高音被蓋過嘅耳塞好多時俾人稱為「分析力」唔夠好。因為感受上高音頻率嘅指向力強，人耳好易聽得出聲音嘅位置，所以如果高音唔突出的話，就會難分得出位置，俾人覺得濛。

圖二嗰兩對都係類似。不過達音科嗰對條線嘅高音有少少肉酸。

佢有幾響係除咗睇靈敏度，重要睇電阻。

本人中學讀文商出身，數理科學知識都係自學。各位師兄見到我唔啱請指正！


大耳筒嘅frequency response作參考

seikomatic

as shown below there is sudden drop around 1K, so does it mean that there is an issue for the bridging between different units DD/BA to cover the range?

For sure we can't just read the charts and conclude which is better than which in terms like musical, warmth, touching ....

saltyfatboy

回覆 2# ntony

要俾個讚師兄既心機寫左咁大篇

中間個段好同意, 所以唔少耳機專登調大聲高頻令到有高分析力既錯覺
個人會睇重層次感低失真, 大細聲當調味, 當然都唔可以太離譜啦

頻響圖都係睇好表面, 大約估下對耳機咩聲底

下面Rtings 有講量度既方法同問題

waltyuen

回覆 2# ntony

多謝師兄 給我自學機會

回覆 3# seikomatic

個網有解釋過是佢去拿店面DEMO機 行人工耳 出錯唔奇

seikomatic

the video above just demonstrated that there might not be a best speaker / IEM given the fact that in addition to the physical properties of the piece including designs, outlook, color and brand name,  there are subjective / personal factors of the listener not only limited to personal preference but even ear canal structures etc. that will directly affect the performance...

saldtch

回覆 1# seikomatic


    dB on the Y-axis is the relative loudness measured by the microphone in response to a relative input of pink noise or sine wave sweep from 20Hz to about 20kHz (the mic can't pickup signal above about 22.5kHz)
65 or 70 it doesn't matter, it is a relative response you can subtract/add all values by any dB.

I think the following articles are worth taking a good read:
https://www.audiology.org/sites/ ... l/JAAA_08_06_06.pdf
https://www.rtings.com/headphone ... -frequency-response

But it is much more simplified for IEM measurements and these are generally for headphones and speakers.

cocteau

左邊既y軸係聲量(db)、下面x軸係頻率(hz)。
加埋一齊睇就係，邊個頻率hz出到幾大聲db。

呢個圖其實係咁黎既，測試時，音源會 "播放" 由最低頻0hz開始，一路掃上去最高20khz，而音源既聲量(db)，係由頭到尾都一致既，例如100db。
咁你隻耳機插入呢段掃頻音源，就會如實播番由0hz至20khz＠100db啦係咪？。。。。。唔係！
因為每隻耳機對唔同頻率既響應都唔同。例如A耳機100hz只出到50db、B耳機會出到80db。
但A耳機1000hz會出到90db、而B耳機只出到30db。每個頻率既響應都唔同。
頻率表就係check下每隻耳機，晌唔同頻率既100db輸入時，佢比番幾多db你。

起始點係65定70無所謂，你測量時音源大聲d佢咪高d囉，但條curve個樣係一樣，只係成條curve移高移低咁解。
你要睇既係條curve個高低起伏，而唔係佢擺晌個表既高定低。
但一般人會將1000hz擺晌0db或100db，咁樣會方便d睇咁解。

咁係咪如果條curve一條直線，無起伏就最好聲呢？你比幾多佢，就比番幾多你，一定係最好啦。。。。。唔係。
事實上人耳好怪，係鍾意無咁老實既聲，簡單講就係音染。有某種音染既耳機，聽出黎反而咁先覺得中性。
所以就有所謂既target curve，即係，你隻耳機條curve最好就係咁上下樣，人耳就會聽得最舒服。
target curve有好幾種，最多人認同既係Harman curve。
http://www.juloaudio.sk/Umiestne ... 0Target%20Curve.pdf

seikomatic

左邊既y軸係聲量(db)、下面x軸係頻率(hz)。
加埋一齊睇就係，邊個頻率hz出到幾大聲db。

呢個圖其實係咁黎 ...
cocteau 發表於 2021-3-10 19:16

".....有某種音染既耳機，聽出黎反而咁先覺得中性..."I think this is the uniqueness of how human brains work....we can always make up missing pieces and filling in gaps ...and even languages might affect the preference across races due to intonation....

IEM manufacturers should tune their products to meet the preference of their target groups of customer by age.

   very educational and clearer now.... then can the effects of separation, staging, spatial effect etc., be measured and shown in some sorts of charts?

下載 (143.03 KB)

2021-3-11 10:47

kk6166

左邊既y軸係聲量(db)、下面x軸係頻率(hz)。
加埋一齊睇就係，邊個頻率hz出到幾大聲db。

呢個圖其實係咁黎 ...
cocteau 發表於 2021-3-10 19:16

其實呢d圖我都想理解好耐，今次真係學到野