其實係點呢? 完全唔明個奧秘。
當你齋睇spec.時介唔介意呢?

應是供電能力不足, 至使喇叭 ohm 數細一倍而輸出功率未必大一倍。你指呢樣吧

是的。 254mm兄。

其實Double power並不是會大聲咗一倍，後級瓦數多一倍實際上音量只能增加3db!反而揚聲器效率應該會對後級功率要求有更大影響性？

E+ d喇叭靈敏度 咁多做係86db附近, 應該有解?

https://tinyurl.com/y85emppc

補充吓我想問

其實係點呢? 完全唔明個奧秘。
好難造咩? 如果易造點解唔所有機都造?
如果難造但係唔係一定對音效有好幫助?
點解又有hiend價的hiend機唔造?
但又講到好好聲，佢地唔驚比人厭棄咩?
還是有D廠否定尼樣野有直接影響?

當你齋睇spec.時你介唔介意呢?

最後修改時間: 2017-08-22 03:46:26

倍數上 即是有超大damping factor丶所以Krell class A amp 不講damping factor, 小弟問過Krell 廠丶他們話 倍到D力丶吾需要講（吹大）了。

不倍的amp 丶如Esoteric 會公開damping factor, 約500、av amp 只得六十。

要明白為什麼要有好的damping

最後修改時間: 2017-08-22 09:33:46

瓦數可以倍上應該係話大電流設計！
8 ohm 100W，4 ohm 200W，2 ohm 400W
要做到先決係阻抗下跌時部 amp 可提供足夠電流。

#6. Damping factor 好，聲音爽快，有啲人又會覺得冇音樂感，所以有人做有人唔做

以下是外國網的
There are others that say, a large number is a must - the higher the better - several s.s. amps claim very high damping factors such as 500 or 800 or even 1000.

There are still others that say that DF is a complicated matter & that there is no correct answer that'll satisfy everyone. Since DF is defined as speaker impedance divided by amplifier output impedance & since speaker impedance varies with frequency, DF will also be a function of frequency. In fact, several amplifier's output impedance is also a (different) function of frequency. So, you have a ratio that has both numerator & denominator with 2 totally different functions of frequency. So, the DF curve, is at best, not drawable on a piece of paper when it comes to a real-world operating condition i.e. a particular amp driving a particular speaker UNLESS you know the exact impedance vs. frequency response of both items.
If you do, you have 1 more hurdle - what is the impedance vs. frequency response of your speaker cables? This fellow features in the mix too!

usually, a DF number is spec'd in the manual using 8 Ohms speaker input impedance. However, are any of your speakers 8 Ohms input? If they are, do you really think that they maintain 8 Ohms from 20Hz to 20KHz? what if your speakers are 6 Ohms input? then, is the DF spec'd in the manual any use to you?

So, best is to use your ears to judge if the amp connected to your speakers is providing you the bass response you are looking for. Forget chasing this spec - I believe that it has little info to offer you.
FWIW.

最後修改時間: 2017-08-22 15:01:33

#10 is very correct, 好聲吾一定要 power不停 x 2, 不過 好低音 amp多數 是倍上！

p800不是倍上，4100話自己倍上，個聲大人同細路仔嘅分別

畀我要，250w@8ohm,400@4ohm,650w@2ohm, 都唔要100w@8ohm,200w@4ohm,400w@2ohm,除非後者係純A類。

可否講解下？

意思可能係ab機翻倍都無用掛！

你可以去睇下英美音響雜誌量度輸出。好多貴貴amp都係量到8ohm 300W，4ohm 350W，2ohm 400W，但spec 寫100W 8ohm, 200W 4ohm, 400W 2ohm。

所以好多100W 貴貴amp聽落去覺得好大力，因為佢真係好大力。

只有好少好少amp推到2ohm load。同埋只有更少喇叭係2ohm load。通常都係屏風，靜電等等。宜家ｄ大大隻低音柱都係有源。可省下好多貴貴amp費用。

其實貴貴amp做好spec真係好容易。做到有音樂感又有氣勢但超溫柔先賣到錢。即係大貨車馬力，法拉利咁好性能先得。

而家的晶体机基本上都係推挽輸出，正負供電。輸出供率就睇電壓同電流。電壓基本整流後係定既(當然爆音樂耗電大會跌Volt), 道理上同一電壓，跌阻抗一半功率就倍上去。但關鍵在于部機出到幾多電流。要高電流基本就係加錢，多輸出管，大火牛，大電容，大整流。