Long long hing

That smart suggestion is great

1)have clear zero base line of any influences
2)result shall be so simple to interpret and quantify too oh.. That is cool, shall not be too difficult to make further assumptions for playback conditon too

It may have some obstacles for picking up, some how may be too tiny signal, however who would if the test not proceed, which may be directly hook up to a scope and let's see



Wonder u have time do so?



最後修改時間: 2024-07-13 17:28:19

忽然間喺度幻想

如果將支唱針, 適當地條低針壓, 放喺一個光滑嘅表面上, 盡力製造一個 有你嘅條件等佢震動, 受到強力喇叭嘅音壓影響
會唔會個輸出 錄出嚟, 係喇叭播放嘅音樂呢?

都是有趣的

最後修改時間: 2024-07-13 18:45:16

喱排有其他玩具要整，冇時間玩喱嘢。 不過喱個實驗相對簡單，一般用家只需錄 phono 輸出嘅 wav files 做比較。

我估喱個幻想可能要 bypass 咗 RIAA curve 先能夠實現，同埋要睇個唱頭本質嘅 microphony 如何。

Long long hing

Nice to be busy for other more interesting things

Haha may be one day if I have time and if i do that test..,


Fun idea and may be able to find out the impact

I have some mic pre amp basically it is a phono amp without riaa
Thx

想討論下如果 Stereo 系統加入 .1/.2 Subwwofer, 大家又會點 Cal
首先 Crossover, 先定好一個 Reference 點, For example, 80Hz

如果 Main Speaker 播 -20 dbfs pink noise signal, 較到 85 dB SPL C Slow
Subwoofer 要調到幾多 db SPL C Slow ?

之後到 phase, 要用什麼方法較正 ?

#25
I copy what John Hunter from REL sub suggests:
Pair of active speakers full range 40 to 35kHz
1 sub crossover @ 50Hz.
1 sub crossover @ 160Hz (just because I cannot adjust crossover of this sub).

The sub crosses @ 50Hz around 2/3 volume dial.
The sub crosses @ 160Hz around 1/3 volume dial.

Phase adjust to so the music sounds 'solid' or louder.

I do not feel bloomed or overwhelming and find they subs integrated well with the speakers.

The subs are on each side flanking the speakers.

I have to say I am not a golden ear to comment whether I am doing it correct or not.
Just sounding right to me.

最後修改時間: 2024-07-14 18:36:04

Volume Knob 擰幾多, 好視乎 Subwoofer 功率
有沒有一個 dB SPL C slow 可參考 ?

應該用 -20dbfs pink noise 信號 ?
還是 Tone Signal at crossover frequency (e.g. 80Hz) 作参考 ?

Phase Difference 要點量度 ?

#27
Wish I can answer you your questions.
I dialled them in by listening.
Afraid I cannot give you what you wish to find out.

#28

I found some suggested practices for Dolby Atmos Music Studio.

https://dolby.my.salesforce.com/sfc/p/#700000009YuG/a/4u000000lFIV/YHgXgrJVKAcelcXkD.DnlRUBZU1CqEMGDKweLRpuu98

If the main speakers are calibrated to have 85dB SPL C slow for -20dbfs pink noise, the subwoofer can adjusted to around 89-91.5 dB SPL.
Maybe this could be a reference start point.

Also, I found using tone signal at crossover frequency for calibration is also referenceing and easy to begin with.

For using a Linkwitz-Riley 24 dB/oct, the level of each signal has -6dB drop.
That means after mixing High Pass Signal and Low Pass signal will result a balanced signal level 0db (+6db)



最後修改時間: 2024-07-15 01:16:01

Hi manyung1987
Many dial in the sub to crossover with mains so a point is set e.g 80Hz.
John Hunter proposes to run the mains full range and supplement the bottom end with subwoofers.
He does 6 subwoofers, 3 on each side, each with different crossover.
General rule is the lower the crossover, the louder it could be.
When the sub can be 'heard' or 'located' cut back volume a little.

FYI
I know you are more about measurements

#31 @MichaelWittmann

Thanks for the information.

As my jobs often include delivering standardized and balanced audio system to the clients
Quantifization of preceived audio that suiting different acoustic environment is needed (include but not limit to single home audio system). For example, room acoustic is not changable in many commercial situations.
Also, for saving time in troubleshooting, professional knowledge and technical measurment becomes essential to provide consulting and tuning service.
At this point, measument data becomes speaking louder than words and shut the mouth up of some trouble makers...

Besides, being an audiophile of different gernes of music,
I tend to listen what the music producers want to show prior to personal taste.
So, to me, balanced audio performance is very important
And that's the reason why I'm interested to discuss testing and applying in this topic... ha

最後修改時間: 2024-07-15 07:16:14

連基本原理都搞錯
就想上嚟呢度出post搵生意

#33

你冇嘢啊？

最後修改時間: 2024-07-15 17:09:05

咁複雜我就唔識喇不過我覺得room correction係必要 最好用digital ，高音都可以吸音反射 幫到少少，而低音係完全做唔到嘅如果地方細的話，
此時room correction就大派用場， 剛剛訂咗部wiim ultra， 免運費2600蚊 唔知可唔可以一改低音過多嘅問題 期待中
到時我只會聽streaming， room eq之後 再以數碼傳送去自己的dac做解碼

最後修改時間: 2024-07-15 18:52:24

#35
反而我搵唔到一部支援 Apple Music Hi-Res Lossless 既 Streamer
Streaming 我個人鐘意 Apple Music 既 library
市面上 Dedicated 既 Streamer 有只得 Eversolo A8, Fiio R7/R9, 啲 Streamer, DAC, Preamp 一體機
我又唔使咁多野...

最後修改時間: 2024-07-16 01:57:29

同埋, 如果做 Digital EQ, 我有一個諗法在想是否可行:

一部行 Linux 既電腦, 接上有 Coaxial/AES input/output 既 interface
入面行 EQ Correction 既 plugins, output 番 digital 信號出黎
但不知中間是否需要牽涉 resampling 問題, 及軟硬體配搭
需要研究一下

#37 wiim ultra 好似你講的組合

#37 可以，但做到hi res串流，我用Apple TV 4k+，限制 44.1k 16 bit 制式，有保留。

Linux 運作平台，有隻Jamesdsp的開放碼軟件，模擬Room EQ Correction，但安裝繁瑣，先在pulseaudio 音放平台，加裝pipewire,Jamesdsp才能運作。我試Jamesdsp 掛到Jriver Linux 版MC32,播NAS串流，對音場調較和強化低音的勁度和韌度方面，很有效果，其流程如下:

NAS=＞＞router wireless wifi 6 ＞＞laptop＞＞老虎魚usb ddc＞＞usb dac

至於Apple TV+ 的串流，用了一個Uxplay軟件安裝在laptop，流程亦如下:

router ＞＞iFi ethernet switch pro with optical fibre＞＞Apple TV＞＞laptop＞＞usb dac

在pulseaudio 介面中輸出選數碼，在Apple TV播youtube 高質檔很有現場感，但掛上Jamesdsp加強音效，則未詳試。

#39
資訊量很多
我消化研究一下先 @w@

最後修改時間: 2024-07-16 17:00:30