MiniDSP UMIK-1 配合 REW 做 Room Correction

hiukong

因為家居環境問題，發覺換左 Q Acoustic 3050i 座地喇叭後，低頻反射得好勁，中頻又焗住焗住咁開唔到聲。見到有師兄介紹呢枝 MiniDSP UMIK-1 的 USB 收音咪，又唔貴，就買黎試下:

落訂兩日就由順豐送到，先發現原來係一間香港公司


個盒都幾靚幾實淨


規格


支咪都幾重下


長長的 USB 線同一個細細的咪座


好彩同三腳架縲絲一樣大小，可以裝落三腳架


即插即用唔駛driver, 但就要上官網下載個 calibration file. 每枝咪都唔同，要跟個 serial no 下載


用REW 免費軟件，有 Windows, Mac 同 Linux 版本，非常方便，我都捐錢支持下


插上 DAC 同咪, 部機要放中間，好彩跟咪線夠長


聽位放咪


先要設定好擴音機音量輸出，個軟件入面已有齊工具，超方便簡單


我跟教學，分左右聲道測量。圖中可見低頻 (40～50Hz) 音壓太大，我估就係室內反射的影響。


調好EQ 後就可以輸出去俾 DSP


我係用 Logitech Media Server (Daphile 版本），入面內置 BruteFIR filter. 可以讀取 REW 輸出的 WAV 格式


簡單報告：低頻反射大為改善，唔再撞到頭暈，人聲都清晒，唔會拿埋一著咁。網上搵到的教學建議試多d 不同的設定，要慢慢摸清楚先再更新下情況，謝謝收看。

pallin

報告詳盡清晰,起碼知道自己器材喺自己聆聽房間還有多少改善?, 謝分享

johnme

師兄得閒就GENERATE個WATERFALL PLOT來睇睇.

hiukong

johnme 發表於 2019-5-27 10:26
師兄得閒就GENERATE個WATERFALL PLOT來睇睇.

師兄，我搞左一輪發覺都出唔到個waterfall。我會搵日再set up 好試試重新量度過，到時有再post 上黎俾你望下。

johnme

hiukong 發表於 2019-6-5 11:38
師兄，我搞左一輪發覺都出唔到個waterfall。我會搵日再set up 好試試重新量度過，到時有再post 上黎俾你 ...

慢慢. 我等你.

johnme

No need to setup the REW again.
If you have saved the last measurement,
you may follow the following steps:

1. Open the measurement file saved.

2. Open the file and click "Waterfall"

3. Click generate.

sunnyslhf

thank you for sharing...

hiukong

johnme 發表於 2019-6-11 19:20
No need to setup the REW again.
If you have saved the last measurement,
you may follow the following ...

唔該師兄。我試下跟住做，但發覺奇怪事件....個 Generate 個制係 disabled. 要再試清楚先得. 等我 Google 下先.

johnme

hiukong 發表於 2019-6-13 09:09
唔該師兄。我試下跟住做，但發覺奇怪事件....個 Generate 個制係 disabled. 要再試清楚先得. 等我 Google ...

Waterfall個制右邊有SPECTROGRAM,
SPECTRGRAM有WATERFALL既效果,
你試下GENERATE 個SPECTROGRAM.


REW EQ係咁,
耐不耐就SHORT SHORT地.

johnme

johnme 發表於 2019-6-13 09:48
Waterfall個制右邊有SPECTROGRAM,
SPECTRGRAM有WATERFALL既效果,
你試下GENERATE 個SPECTROGRAM.

This is a waterfall plot generated from my measurement data file.

The vertical axis is SPL (sound Pressure level) .
The Horizontal axis is frequency.
The  3rd axis point out of paper is Time.

This plot shows how sound decay in your room across different frequency.

You can see that it takes very long time for frequency below 200Hz to fade away in my home.
There are peaks and toughs which are room mode (resonance frequency due to the dimensions of a room)