我用書架或座地喇叭，都可从夾到REL SUb

#53

thx for reply.我有一組 audio都係咁駁

high level 因用 膽合併m

#51

用high level定line level input or both?

最後修改時間: 2020-10-31 07:01:34

最終入手了REL, 唔難set, 效果幾好,soundtstage 好左, 滿意收貨

I believe 神木以及聖杯這些東西, they can be useful for enrich upper frequency range listing experience

Or anyone have their own special trick in their room

Haha

something nice to share from my basic under understanding of even harmonic

personal experience from playing an instrument and listening to someone who play instruments - piano and guitar

it is pleasant/fuller body of the tone to my ear , if i play a C2 note, and having a touch , a lighter touch of C1, and C3, one upper and one lower harmonic from a guitar all the same time (sometime i can do ti..sometime i could not ) haha....
C2 , with C3 harmonic ..i feel sense of enrichment ( we need to do that if we want to impress a girl...for more romantic tone for a romantic intention ...doing everything i can...to make sure.....haha)

with C2 with C1 harmonic , i feel the rhythmic side of feeling is enriched ( we need to do that if the Bass player is missing haha )

same things ..some feeling , depending on the need, if it is C2, and a lighter touch of C1 , or C2 with a lighter touch of C3 at the same time


from those that personal experiences, i tend to believe or even wishes for a hifi system may able to give me content from 2nd / 4th order even harmonic ..which from a C2 , there is a decay content of that note but passing out through the speaker with a lighter sense....C4...

harmonic content is the reason when i see a spec from a speaker with frequency range upto 40khz +/-1 db type of things , i do not feel the maker is wasting any effort, and super appreciate their intention for us to enjoy those upper harmonic content, hope...someone will feel it and be delighted

i wish those speaker can archive the same things by a reasonable sizes home used speaker for lower registry too, but it is so many constrains


Someone had mentioned below... try to play a Open E from the double Bass or take it further...tone that instrument at open D, try within a smallish practice space lets say 8x8x9 ft . which will create so many wonder. We play that single tone..and we hear it haha


lets look at that in different View...a piece of Electronic device

funny things is...there are specific Regulation for some type electronic device, those 2nd order or 4th order harmonic at upper frequency range, it cannot be PASSed some FCC etc... but authority always forgiving for audio device for home

DSP based power amp is something interesting same as many DSP based device... ..as it can be cheated with artificial harmonic in principle without too much difficulty i suppose ( there are quite a few harmonic enrichment algorithms are there for long time ) ..... wonder...if it is a DSP based DAC , with a button " Harmonic Enriched / By Pass Harmonic algorithms ) ..it seem nice..............



最後修改時間: 2020-10-28 12:05:48

I believe it has been mentioned :psychoacoustics

It's not a matter of if we could hear it, but we see it, feel it and eventually "tangization" comes to actualisation.

So often "Myth" is being deployed in the process but quite unfairly labelled in the sense of negativity.

I suppose the marketing takes the blame for such bad perception with "myth" but then we shouldn't ignore the force of imagination being the important, if not the most important, integral part of "myth" associated with creation and invention.

If people believe it and buy it and I call it a dream buy. Of course one must wake up from the dream at some point.

And another dream will begin. Somehow we, as human beings, are willing to be exploited by all these dream toys because the idea keeps us going, for what we are.


最後修改時間: 2020-10-28 05:10:47

if we care only about the hear-able frequencies, super tweeter is a piece of garbage and so does any sub bass gear. If there are manufacturers specializing in these gears and people are buying, it is probably something more than a myth.

玩超低，首先决定接駁方式，如有源定無源(近年甚少)，經唔經超低內置電分?定係Add On駁尾bi amp?最後不離擺位，校分頻點，校相位，校超位音量。

如果加了超低衰聲咗，除非係前級要推bi amp引起的變聲，令用家無論開唔開超低，主聲道聲音都會差咗，否則就係調校不適當。

正常普通組合可以出埋超低，一定靚聲D。

我自己為避免前級推bi amp變聲，通常另外用獨立DAC餵超低，壞處係不可唱黑膠和Tuner,及音量調校不方便。

最後修改時間: 2020-10-25 21:02:55

#43 如果用double bass響你身邊拉一下open E係失真嗎? 答案 顯而易見

[36] 聲波完整性，強加sub = 失真？

#40
Welborne兄
physics係其中一種解釋我哋"聽"到乜的科學，仲有 其他科學例如 psychoacoustic

https://en.wikipedia.org/wiki/Psychoacoustics

呢段有關耳筒播/聽低音的問答都有 interesting points:
https://www.quora.com/How-can-headphones-produce-low-notes-when-speakers-have-to-be-large

聾人是否聽到聲？
https://assistivetechnologyblog.com/2016/06/can-deaf-people-hear-music-answer-yes.html


大牛筋去到最低有 41Hz， bass guitar可能有 D去到2X Hz。平時坐低聽音樂有幾可經常連續聽到 40Hz以下?有幾可聽一大段 pipe organ / double bass / bass guitar lower notes?好多時發燒友係要特登搵特別音效去"聽"低過 40Hz的低頻。

唔計失真/roll off/SPL 出到 20Hz就好多 speakers都得。Subwoofers出到20-120低音更加"明顯"，以前睇戲都俾樓上樓下投訴過幾次。20Hz technically可以好多出到，"靚"低音真係唔易出。



最後修改時間: 2020-10-25 14:50:49

我覺得房間對低頻的影響主要在 cancellation / room mode 而非「出唔出到」吧。

Dutch & Dutch 8C 可以去到 20Hz
https://www.stereophile.com/content/dutch-dutch-8c-active-loudspeaker-system-measurements

很有趣的討論，我完全唔係物理學底，不過我嘗試想像一下耳機和喇叭的分別⋯⋯

1）耳機：耳機戴在外耳，耳機的震膜跟我們的耳膜形成一道緊密銜接的空間，幾乎是fully coupled，一條membrane to membrane的pressure tunnel，中間沒有太多interference，headphone membrane的一切活動都simultaneously trigger 耳膜 follow。當你掹開headphone少少讓他離開耳仔，呢條close tunnel 的air pressure就leaked了，即使距離仍然好近，發現低音突然冇晒。

2）喇叭 in room：我們的 耳膜跟喇叭單元共處一室，耳膜不是直接coupled to speaker cone，而是 speaker cone 發出的低頻在空間內的各種interference，是一個room acoustic product，非常複雜混亂，房間的長濶高似乎是真的會影響到低頻的"sensation"。

只是小弟的想像力太豐富，以上描述可能根本不成立，有錯請指點。我真的不是物理底。

最後修改時間: 2020-10-25 14:17:21

interesting topic

we tend to believe even order harmonic make sound more pleasant for our ear

their is even upper order and lower order of even harmonic too

harmonic always have a rate of decay , the magnitude of harmonic is always much lower than the source, no matter it is upper or lower , no matter it is odd or even order too ( if it is a peak of a harmonic which having higher magnitude than the sources , then it must bed induced by some order external factors )

so as the decay of the the lower harmonic of bass, we may not necessary to make sure the frequency responses to be so flat down to 20hz..or even 40hz zone for many kind of music

it does make sense for having super tweeter and sub woofer to enhance the harmonic richness of our listening session










最後修改時間: 2020-10-25 14:03:16

B&W 800d 。

在20Hz音壓位準低過30Hz有10dB，低過60Hz成14dB，如果度到20Hz有反應而唔理輸出音壓和失真度的話，大把喇叭可以話(可達)20Hz。



最後修改時間: 2020-10-25 13:31:40

耳機可以出到低頻因為音壓極低，發聲單元離開耳膜只有幾mm。
一般家居喇叭單元離開耳膜有幾公尺，當低頻衰減到某一程度根本聽唔到。

＃21 諗下耳機為何都有低頻就會理解得好d, 其實唔係間房要滿足到波長才可以聽到該頻率，問題係聲波完整性，但我都懷疑人耳對呢樣野嘅敏感程度，音響真係一樣好有趣嘅事情，如果包含心理學，仲更加複雜