#37 wiim ultra 好似你講的組合

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

#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

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

#33

你冇嘢啊？

最後修改時間: 2024-07-15 17:09:05

連基本原理都搞錯
就想上嚟呢度出post搵生意

#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

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

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

#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.

#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.

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 ?

#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

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 ?

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

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。

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

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

我估可以做個簡單實驗比較吓，唱針放嗰支碟個盤唔需要轉動，喇叭播放喱一個 source on/off 比較錄出嚟嘅 files 甚至播放錄咗嘅 files 聽吓 pick 咗幾多訊號就應該有個大概比較。

Long long hing

咁多年 都有幻想如果一個唱盤 冇咗喇叭音壓嘅影響嘅聲音表現會有啲乜嘢唔同有幾多唔同

有冇一些估算嘅數據 可以分享一下呢?

理論上可以睇到兩個檔案嘅分別, 唔知有冇人做過你這個簡單嘅實驗有一些有趣嘅數據 1)table direct to DAC without speaker
2) playing the record, listening to it, at the se time feed to DAC from a tape loop etc..


有一些人可能有一些資源可以做一個 小小的獨立唱盤房間, 如果是值得的, ,


Thx Thx.