兩聲道
CD機 | MD機 | SACD機 | DAC | CAS | 合拼擴音機 | 前級擴音機 | 後級擴音機 | 接線 | 喇叭線 | 揚聲器 | 耳機 | 耳機擴音機 | LP產品 | 膽機產品 | 開卷式錄音機 | 音響配件 | DIY音響 | 電源 | 家庭影院
電視機 | 投影機 | 錄影機 | DVD影碟機 | Blu-ray影碟機 | 多媒體播放器 | 機頂盒 | 多聲道擴音機 | 多聲道揚聲器 | 多聲道影音組合 | Mini音響組合 | 重低音揚聲器 | 輔助設備 | 同好會
同好會 | Accuphase | B&W | Burmester | Denon | Jadis | KEF | KRELL | Luxman | Marantz | Nuforce | OPPO | Pioneer | TEAC | WEISS | News
News | Blog | 其他
其他 | 所有 |
| 影音天地主旨 ﹝請按主旨作出回應﹞ 上頁 下頁 首頁 尾頁 | 寄件者 | 傳送日期
|
| [#41] 電反箱問題 Even that, if mains polarity is incorrectly connected to the wall socket, it can crease strong EMF thus degrade the sound performance of your Hi-fi equipment. Ha ha, I think your guys need to pay me the tution fee. 最後修改時間: 2011-04-09 20:51:37 |
rcywong 正式會員1.xxx.xxx.171 |
2011-04-09 20:50 | |
|
|
|||
| [#42] 電反箱問題 ＞Although DC regulator circuit can get it smoothest but it still affects shifting in cycle times at the rectified circuitry Please pardon the thickness of my skull, please explain what does it mean in terms understandable by people who had just 1st year college physics. In particular, why would reversing the mains polarity create a "180 degree delay"? Did you mean the mains cycle would be delayed 180 degree in the time domain and that would somehow, affect the sound of a piece of hifi equipment? Thanks. ＞Even that, if mains polarity is incorrectly connected to the wall socket, it can crease strong EMF thus degrade the sound performance of your Hi-fi equipment. Oh really? I would love to know the reason behind it. 最後修改時間: 2011-04-09 21:10:46 |
olddude 正式會員 218.xxx.xxx.165 |
2011-04-09 20:55 |
| [#43] 電反箱問題 EMF induces according to internal circuit board. This is very complicated talking at re33 just a few words. Please go online and search this topic then you may find some articles talking about EMF vs polarity, If you're interested. 最後修改時間: 2011-04-09 21:13:57 |
rcywong 正式會員 1.xxx.xxx.171 |
2011-04-09 21:09 |
| [#44] 電反箱問題 I would be really grateful if you could give me some pointers and links. Thanks in advance. |
olddude 正式會員 218.xxx.xxx.165 |
2011-04-09 21:17 |
| [#45] 電反箱問題 Make it to simple: We got energy from electricity supply which is AC then converted it to DC and then back to AC on amplifier's o/p. The entire processes are related to time domain. Of course, it is a very short time period. Don't mix up the phase polarity of mains and signal phasing. 最後修改時間: 2011-04-09 21:41:45 |
rcywong 正式會員 1.xxx.xxx.171 |
2011-04-09 21:39 |
| [#46] 電反箱問題 ＞The entire processes are related to time domain. Please enlighten me in more details on the time domain relationship between the energy supplied from AC mains and the output of an amplifier. I guess with my understanding of basic electronic theories (like, I know things such as how a simple transistor circuit works), I should be able to figure my way out of the science of the said relationship. ＞it is a very short time period If there is a significant relationship, then even a nano second would make a observable difference, right!?! ＞Don't mix up the phase polarity of mains and signal phasing I don't think I had mixed up the two. I was quoting from your post. You did say when L & N were reversed, there would be a 180 degree delay, right? Well, "delay" could only be interpreted as a time difference in the time domain, right? And my questions were: 1) why would reversing the mains polarity create a "180 degree delay"? By "polarity" I mean the connection of L & N. I might have used the wrong term here, I am not an electrical engineer after all. 2) Did you mean the mains cycle would be delayed 180 degree in the time domain and that would somehow, affect the sound of a piece of hifi equipment? I didn't mean signal phasing, I just meant the general sound quality of a piece of hifi equipment. 最後修改時間: 2011-04-09 22:10:47 |
olddude 正式會員 218.xxx.xxx.165 |
2011-04-09 21:57 |
| [#47] 電反箱問題 rcywong hing : 好明顯你連整流濾波原理都未搞得清楚，交流電經整流電路後變成乜野？仲有無頻率呢？再經埋濾波電容之後又變左乜野？如果後面仲有穩壓電路，咁穩壓後出來仲有無交流成份？如果有，交流既L相會係直流既正定係負？ 如果我再講深入D變壓器工作原理，你跟唔跟得上先？單相交流變壓器初級只有兩條接線，點樣決定邊條線接L或者N呢？AC反相即係180度？forward 定係 backward 呢？對於變壓器來講，如果係forward係會點樣，Backward又會點樣？變壓器磁路又會變到點樣？次級既電子流又會跟住變成點樣？ Time domain 時間軸千萬唔好提，除非你有本事做一套 Hi-Fi 系統，從音源到喇叭都可以無任何形式既負回輸電路，我想像唔到邊個有呢份本事。 poweramp 輸出係真正交流咩？如果你堅持話係，你講唔講得出點解DC放大電路又會變成AC輸出？平衡放大同不平衡放大又有無分別呢？ 我語重深長既講多次，唔識可以靜靜地上網找資料，或者靠邊站聽課，唔好嗡得就嗡，眙笑大方！ |
simon62 正式會員 119.xxx.xxx.241 |
2011-04-09 23:13 |
| [#48] 電反箱問題 good points thanks |
batmanames04 正式會員 180.xxx.xxx.243 |
2011-04-10 14:46 |
| [#49] 電反箱問題 Tak a look here guys........ Myopia! Polarity We are of course referring to AC mains power polarity as connected to individual system components. When there are polarity variances between components within an overall system, this can have a detrimental quality on the resultant sound. Specifically, in imaging, solidity and clarity. Let's set up our system properly by working through the following tasks. First of all, disconnect all components from each other and from the power source. This is a good opportunity to inspect and clean all the contacts of your power connections and also the component interconnects. Now connect your speakers to the amplifier (assuming an integrated - if not see note at the end of this section) and connect the amplifier to the power source using the conventional polarity settings for live and neutral connections. If your power connector is 2 pole (as opposed to 3), mark one side of the connection accordingly. Place your speakers in a close position equi-distant from your listening position or, if available, connect a good quality pair of headphones. Now, connect the first source component, such as your CD player for example (assumes integrated transport / DAC). Play a good quality CD with a distinct acoustic. A live choral work, opera or jazz ensemble would be a good choice. Listen attentively both to the individual sounds and their placement within the overall acoustic space. Now, reverse the polarity of the mains power connector and listen to the same piece again. There WILL be a difference. One connection will provide an enhanced imaging of individual instruments and voices with a more solid lower register. The other will sound slightly vague with a loss of focus and less weight in the lower frequencies. When you have identified the correct setting, mark the power connector accordingly. Now connect the next component, your tape deck or tuner perhaps, and go through the process again, identifying and marking the correct polarity for THAT component. Repeat the process for each component in turn until you have completed the settings for your entire system. For two part components, if they each have a dedicated power connection, then treat them as individual components. Phase By phase, we are not referring to the gross distortions immediately recognisable when one of your loudspeakers is connected out of phase, but to absolute phase. Why is this important? Well, not every hi-fi component maintains phase coherency throughout the entire signal path. Indeed, some components invert phase from the input to the output. If you want to be pedantic you could analyse each component seperately and if need be carry out internal modifications to ensure phase coherency. However, for a simpler approach, especially if you primarily listen to one source such as CD or disk for example, you might try the following. Having set up your system to give the best possible sound, including carrying out the polarity tests referred to above, try the following test. Play a familiar, good quality recording which has a good sense of depth and a defined acoustic. Now swap the positive and negative connections to BOTH loudspeakers and listen again. Is there a difference? Does one position provide a more distinct acoustic with sharper imaging? Then this is the correct position. Note! This is a fairly subjective test and not absolutely conclusive as there may still be phase inconsistencies between individual source components. Indeed, there are sometimes phase inconsistencies between drivers in multi driver loudspeakers. It is a broad subject area on which you COULD spend a lot of tweaking time. However, the simple test referred to herein may prove valuable for you. |
rcywong 正式會員 219.xxx.xxx.89 |
2011-04-11 10:47 |
| [#50] 電反箱問題 rcywong please dont drift to something else and learn more from the following "好明顯你連整流濾波原理都未搞得清楚，交流電經整流電路後變成乜野？仲有無頻率呢？再經埋濾波電容之後又變左乜野？如果後面仲有穩壓電路，咁穩壓後出來仲有無交流成份？如果有，交流既L相會係直流既正定係負？ 如果我再講深入D變壓器工作原理，你跟唔跟得上先？單相交流變壓器初級只有兩條接線，點樣決定邊條線接L或者N呢？AC反相即係180度？forward 定係 backward 呢？對於變壓器來講，如果係forward係會點樣，Backward又會點樣？變壓器磁路又會變到點樣？次級既電子流又會跟住變成點樣？ Time domain 時間軸千萬唔好提，除非你有本事做一套 Hi-Fi 系統，從音源到喇叭都可以無任何形式既負回輸電路，我想像唔到邊個有呢份本事。 poweramp 輸出係真正交流咩？如果你堅持話係，你講唔講得出點解DC放大電路又會變成AC輸出？平衡放大同不平衡放大又有無分別呢？ 我語重深長既講多次，唔識可以靜靜地上網找資料，或者靠邊站聽課，唔好嗡得就嗡，眙笑大方！" |
batmanames04 正式會員 61.xxx.xxx.217 |
2011-04-11 11:10 |
| [#51] 電反箱問題 "poweramp 輸出係真正交流咩？如果你堅持話係，你講唔講得出點解DC放大電路又會變成AC輸出？平衡放大同不平衡放大又有無分別呢？" ＜- 喱個我真係睇唔明喎,請問有冇人可以解釋吓? |
長長影子 正式會員 202.xxx.xxx.32 |
2011-04-11 13:11 |
| [#52] 電反箱問題 pulsating DC？ |
vw2202 正式會員 220.xxx.xxx.213 |
2011-04-11 14:00 |
| [#53] 電反箱問題 ＞Tak a look here guys........ Myopia! ＞ --- few hundred words describing the phenomenon of the change in sound resulting from the change in mains polarity deleted --- I guess most people here understand what it means by "mains polarity" and "phase coherent". Then again, after so many words, I am still waiting on your enlightenment on the points you had raised such as "the entire processes [as in converting mains power to output signal to speakers] are related to time domain" and "180 degree delay [in the mains power when L & N are connected in reverse]". 最後修改時間: 2011-04-11 16:03:49 |
olddude 正式會員 202.xxx.xxx.84 |
2011-04-11 16:03 |
| [#54] 電反箱問題 呢個都市傳說聽左好多年 話對音色, 相位之類野有影響又有理論的前輩高人, 請指教下圖LN倒轉駁之後有何分別  最後修改時間: 2011-04-11 16:43:53 |
淡如水 正式會員 61.xxx.xxx.252 |
2011-04-11 16:40 |
| [#55] 電反箱問題 點會有分別！L&N只對地線有分別。你幾時見過電源牛輸入端有分L同N?請指教一下。 |
freemanfung 正式會員 113.xxx.xxx.160 |
2011-04-11 21:47 |
| [#56] 電反箱問題 d密封式電源牛,出兩條線,又點分LN呢 真實例子-有位高手前輩,將LN交差幾次後,聽完一輪,認定LN 哪.而家正幾多,一個月後,同樣係咁講,交差幾次後,頭先LN掉轉,哪.而家正幾多 佢唔得上次已經掉過果部.原來LN要隔一個月掉一次,果然高手! |
水胡 正式會員 119.xxx.xxx.36 |
2011-04-11 22:30 |
| [#57] 電反箱問題 推下先, 請之前話有影響的高手快D出來, 指點下小弟#54個全波整流LN倒轉駁有咩分別 |
淡如水 正式會員 61.xxx.xxx.252 |
2011-04-11 23:42 |
| [#58] 電反箱問題 純阻性負載跟感性負載比較，打矛波啊。 咔~~咔~~~~~ |
simon62 正式會員 113.xxx.xxx.57 |
2011-04-12 00:25 |
| [#59] 電反箱問題 As far as I know, reverse of polarity will impose electric potential to the chassis.. I have ever done an experiment... left the ground.. measured electric potential of the chassis with both polarity.... of course it can be solved by grounding... but would there be adverse effect..? I can't tell.... ^^ |
hiphopzz 正式會員 218.xxx.xxx.80 |
2011-04-12 00:40 |
| [#60] 電反箱問題 回#58 咁將R轉為: 有C有L有active component的complex load LN倒轉有咩影響? 真是請指教指教 |
淡如水 正式會員 61.xxx.xxx.252 |
2011-04-12 01:26 |
