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[#1] 喇叭阻抗對純A類擴音機的影響 轉載 喇叭阻抗對純A類擴音機的影響: 一部 50W 8-ohm 的純 A 類擴音機在最大輸出功率時,輸出峰值電流達到 +/- 3.54 A。當負載降至 4 ohm,理想情況下最大功率由 50W 升至 100W,但A類輸出電流仍然是 +/- 3.54 A,純A輸出電流不變,負載阻抗減半,因此純 A 功率也減半至 25W,所以用 4 ohm 負載時只有25W是純 A 類,其餘 75W 是 AB 類。2 ohm 負載時 12.5W 純A類,187.5W AB 類。 要確保純A類運作,一定要用 8 ohm 喇叭。 |
MDLP 正式會員 79.xxx.xxx.104 |
2022-09-27 22:15 | |
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[#2] 喇叭阻抗對純A類擴音機的影響 想知道係唔係 用1奄喇叭過火數會細咗? 用32庵喇叭火數就加大? 奄數無限大火力係咪無限大? |
MDLP 正式會員 79.xxx.xxx.104 |
2022-09-27 22:18 |
[#3] 喇叭阻抗對純A類擴音機的影響 #1 : correct #2 : 細心再讀一次 #1 最後修改時間: 2022-09-27 22:35:10 |
thomasc2 正式會員 222.xxx.xxx.228 |
2022-09-27 22:34 |
[#4] 喇叭阻抗對純A類擴音機的影響 唔知我有冇 理念錯誤, It is the output of the amp to drive a load, if it is different load.. 4ohm and 8 ohm, from the given example However how much output is actually dictated by the dynamic range of the music passage, which max available output is affected by the complex loading characteristic of the speaker.. Passive Speaker as such cannot control amount of output of the amp, however affect the max available output only.. We could only wish the output of the amp for that music passage under max output from the loading of that frequency Etc. If the dynamic of that music exceed the max output for that loading.. It clips.. This is the way I understand it Nice if some expert able to give us some teaching.. Servo motor feed forward, feedback active speaker may be.., but not the way of passive speaker.. Love to be teached Thx Haha 最後修改時間: 2022-09-27 22:46:22 |
hahayanyan 正式會員 182.xxx.xxx.200 |
2022-09-27 22:38 |
[#5] 喇叭阻抗對純A類擴音機的影響 我認為個post 講啲嘢係唔岩嘅。 |
Kenny 正式會員 14.xxx.xxx.35 |
2022-09-27 23:53 |
[#6] 喇叭阻抗對純A類擴音機的影響 #1 aims as explaining, basically, the TYPE of output power (eg A , AB ...) an audio amplifier will deliver under same operating conditions but different resistive loads. #4 If I have understood it correctly, couldn't find anything wrong, but also anything significantly relevant to what #1 aims at. |
thomasc2 正式會員 222.xxx.xxx.228 |
2022-09-27 23:57 |
[#7] 喇叭阻抗對純A類擴音機的影響 乜野好聲衰聲你可以隨便認為, #1 講的是科學, 關乎理論, 物理, 數學, 唔到你或任何人去認為, 除非你可以推番前人已定立並被廣泛接受的論據 最後修改時間: 2022-09-28 00:12:31 |
thomasc2 正式會員 222.xxx.xxx.228 |
2022-09-28 00:09 |
[#8] 喇叭阻抗對純A類擴音機的影響 Even if it is a speaker.. Having linear Impedance at 8 ohm (which seem rarely one) But if the music.. Demand 50 watts of some loud drum solo... It need 50 watts... So it has clipping...if at 8ohm the amp output is 20W Class A, and 40W AB.. Etc.. Having an linear loading speaker does not make any changes... It is the music command the amount of power.. This is the way I understand it Haha 最後修改時間: 2022-09-28 00:18:29 |
hahayanyan 正式會員 182.xxx.xxx.200 |
2022-09-28 00:11 |
[#9] 喇叭阻抗對純A類擴音機的影響 #8, You are again totally right. But also again, not too relevant to what #1 cares about. |
thomasc2 正式會員 222.xxx.xxx.228 |
2022-09-28 00:14 |
[#10] 喇叭阻抗對純A類擴音機的影響 Thx thx thx May be I do not really know what does he care.. Is quite an interesting topic Especially I never try to read.. How the amp circuit implementation from A to AB 最後修改時間: 2022-09-28 00:19:23 |
hahayanyan 正式會員 182.xxx.xxx.200 |
2022-09-28 00:16 |
[#11] 喇叭阻抗對純A類擴音機的影響 我不是工程師,不過知道胆機就係純A類。 我估計胆機未必有3A 電流一邊….. 如果係石機,好似不是佢講咁操作。 |
Kenny 正式會員 14.xxx.xxx.35 |
2022-09-28 00:19 |
[#12] 喇叭阻抗對純A類擴音機的影響 Well , may be not totally right this time. Weak amplifier clips much easier at peak high frequencies, such as piano music and soprano . |
thomasc2 正式會員 222.xxx.xxx.228 |
2022-09-28 00:20 |
[#13] 喇叭阻抗對純A類擴音機的影響 Oh I think #1 have a point... Oh I think I got his point.. Haha Just may not have any linear Impedance speaker around. #12 Yes..yes.. Thx for thst good reminder #11 Only single end tube amp is class A Push pull is class AB And I am wondeing can a push pull be class A by different way to look at it? By filtering half.. And then combim them? May be...or some sort of inverted circuit to one of the tube.. Etc.. May be.. It can But some tube push pull is class AB 最後修改時間: 2022-09-28 00:32:00 |
hahayanyan 正式會員 182.xxx.xxx.200 |
2022-09-28 00:23 |
[#14] 喇叭阻抗對純A類擴音機的影響 我覺得唔係咁 对於部amp 輸出50 watt 係8 ohm load 係IxIxR = 2.5x2.5x8 =50watt power, 即係只需要2.5A电流流過8 ohm負載就出到50Watt功率,呢樣只对負載喇叭而言不論係Class A, Class B ,或Class D都一樣 但係於不同放大电路不同,唔同Amp 內部消耗电能不一樣 例如Class A push pull 石机电路可出50watt 功率,push pull功率係要不停地消耗最少100watt 电能,正與負加埋輸出电晶體長期4至5A电力消耗 若果是單端甲類要輸出到50 watt, 那功率級要不停地消耗最少150 watt电力,如果係有部一比一冇step down單端,輸出50watt就要係功率級長期6至7A靜態电流 对於普遍Class AB 50watt push pull 而言,因為其A類含量冇標明, 可能係3 watt A 類,3 watt後係Class B, 咁樣係細声時不停耗电只需10+ watt电力,到佢開大声到50Watt輸出,當時才會扯电耗到70 watt 电因為push pull Class B 效率為最多75%,Class AB係按輸出大少去調節其用電量 最後修改時間: 2022-09-28 00:27:48 |
niceday009 正式會員 218.xxx.xxx.19 |
2022-09-28 00:25 |
[#15] 喇叭阻抗對純A類擴音機的影響 膽機石機都有A, AB, B......類, A纇又再分A1, A2............................. 祇有單端機(可膽可石)至一定是A類, A及AB可能發生在同一部機時就understood一定不是單端, #1 是對的, 冇"好似" |
thomasc2 正式會員 222.xxx.xxx.228 |
2022-09-28 00:32 |
[#16] 喇叭阻抗對純A類擴音機的影響 Thx 每日learn 多一點點真好 Thx Haha |
hahayanyan 正式會員 182.xxx.xxx.200 |
2022-09-28 00:35 |
[#17] 喇叭阻抗對純A類擴音機的影響 #11 推挽胆机有A類也有AB類 只有單端机才一定是A類 最後修改時間: 2022-09-28 00:42:22 |
niceday009 正式會員 218.xxx.xxx.19 |
2022-09-28 00:39 |
[#18] 喇叭阻抗對純A類擴音機的影響 Niceday hing 有一個小小off topic question Use El 34amp just as an example 1)a power amp have 2X EL34 平衡單端 2)a power amp have 2x EL34 push pull AB 聲音的分別會係點呢 3) a power amp have class A psuh pull EL34 , need 4x El 34? Can that be done by 2xel34? how's no. 1 PSE Vs class A Push Pull ? 有時間都係好好地認真的 再讀書 for those topic.. Haha... 讀完書要運用才不會忘記 總有一天我這0.1桶水會變成半桶... Haha 最後修改時間: 2022-09-28 00:51:13 |
hahayanyan 正式會員 182.xxx.xxx.200 |
2022-09-28 00:43 |
[#19] 喇叭阻抗對純A類擴音機的影響 #1 ONLY 簡單地 解釋同樣的bias current下唔同阻抗的負載的輸出功率的類別, Mr. haha 提到 signal 的frequency, 009再加入電能 (power supply?) 當然這兩樣與output power 及其類別亦有密切關係, 只不過這兩樣並不是#1所針對的因素, 甲 : 唔食飯會死, 乙 : 唔飲水也會死, 乙是 100% correct 但唔表示甲錯 |
thomasc2 正式會員 222.xxx.xxx.228 |
2022-09-28 00:52 |
[#20] 喇叭阻抗對純A類擴音機的影響 以前有個大廠老闆工程師,同我解釋佢啲架生點樣推靜電喇叭,impedance 由2 ohm 到 50 ohm,佢話佢地用voltage driven,不是吓吓見到唔同impedance 都加大或者減少電流的。 |
Kenny 正式會員 14.xxx.xxx.35 |
2022-09-28 00:52 |