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
|
| [#1343] Quad ESL You should try your EICO HF85 :-) _________________________________ I'm using only the line stage, so would ST84 not just the same or even better? I've lent the HF85 to a friend driving a Heathkit AA-121. |
cpsjj 正式會員220.xxx.xxx.37 |
2006-09-13 16:35 | |
|
|
|||
| [#1344] Quad ESL CP Obviously your power amplifiers are more than your pre amplifiers :) John |
Gingers 正式會員 218.xxx.xxx.4 |
2006-09-13 17:15 |
| [#1345] Quad ESL Not quite, John. But getting a match for 12.1 seems a different thing. I've already got with me Fisher 80C, Scott 130 and 121C, Eico HF85 and ST84, Siemens V72 and V74, Klangfilm V004, Quad 22 and 33, a Behringer, a transformer passive and a resistor passive; and for modern ones, an ARC Ref 1 at home. That should be more than adequate. What else do you recommend? |
cpsjj 正式會員 220.xxx.xxx.37 |
2006-09-13 17:24 |
| [#1346] Quad ESL CP, My God, you didn't tell us you own such a big collection. Will you consider to open a second hand vintage shop? |
dkyyu 正式會員 218.xxx.xxx.87 |
2006-09-13 17:57 |
| [#1347] Quad ESL Patrick, Don't come down until we call you. The weather is terrible and it should be cold and windy tomorrow. |
dkyyu 正式會員 218.xxx.xxx.87 |
2006-09-13 17:59 |
| [#1348] Quad ESL Not quite, John. But getting a match for 12.1 seems a different thing. I've already got with me Fisher 80C, Scott 130 and 121C, Eico HF85 and ST84, Siemens V72 and V74, Klangfilm V004, Quad 22 and 33, a Behringer, a transformer passive and a resistor passive; and for modern ones, an ARC Ref 1 at home. That should be more than adequate. What else do you recommend? ------------------------------- Dennis See. This is the way to confirm CP is a great collector. CP Obviously your pre amplifiers are more than your power amplifiers :) John |
Gingers 正式會員 221.xxx.xxx.161 |
2006-09-13 19:14 |
| [#1349] Quad ESL Don't come down until we call you ---------------------- Dennis......I'll keep myself warm and dry by staying behind that big glass front door. And I wouldn't come out until I see yr car. Regds |
Pcs100 正式會員 219.xxx.xxx.201 |
2006-09-13 19:16 |
| [#1350] Quad ESL Obviously your pre amplifiers are more than your power amplifiers :) ________________________________________________________________________ I won't be tricked this time. I'll keep that secret. |
cpsjj 正式會員 219.xxx.xxx.128 |
2006-09-13 19:22 |
| [#1351] Quad ESL This is the way to confirm CP is a great collector. _______________________________________________________________ And that is not a worthwhile collection, just a dumpsite. Nothing compares to Gingers' Leak castles and 3/5a wall, not to mention rcwy's Eico stairs. |
cpsjj 正式會員 219.xxx.xxx.128 |
2006-09-13 19:26 |
| [#1352] Quad ESL What else do you recommend? ______________________________ John, You still haven't answered my question. |
cpsjj 正式會員 219.xxx.xxx.128 |
2006-09-13 19:45 |
| [#1353] Quad ESL CP http://i55.photobucket.com/albums/g144/US_AMP/ResizeofCabinet022.jpg :-) |
Gingers 正式會員 221.xxx.xxx.161 |
2006-09-13 19:55 |
| [#1354] Quad ESL Agent 007, 008 and 009 all came to my place today and saved the Queen. The sound of my OTA ESL was terrific the first moment when we pluged to the CD source. There are only two queries left to be solved: 1) The manual says the value of resistor connecting to treble panel is 150K. The measurement we found on all old and new units is 10M??? 2) The voltage of bass panle should read as 6K (4K if using HT proble). Big hum noice will be generated as indication of leakage if below 2K. However, we found the values on both left and right are same at 1.4K but sound is Ok with no hum???? Strange enough? WIll write to OTA. |
dkyyu 正式會員 210.xxx.xxx.217 |
2006-09-14 19:19 |
| [#1355] Quad ESL Dennis, Happy to know the Queen is saved and in excellent condition now! Wish someday later can see and hear the Quuen sing. |
jcml 正式會員 218.xxx.xxx.228 |
2006-09-14 20:33 |
| [#1356] Quad ESL Dennis, Since you are so interested in the article on electrostatic loudspeakers in the current issue of Hi-Fi Review, I am copying a passage here from "The Complete Guide to High End Audio" by Robert Harley on electrostatics which is basic but more comprehensive. -------------------------------------------------------------- The Electrostatic Driver Like the ribbon/planar transducer, an electrostatic driver uses a thin membrane to make air move. But that’s where the similarities end. While both dynamic and ribbon loudspeakers are electromagnetic transducers – they operate by electrically induced magnetic interaction – the electrostatic loudspeaker operates on the completely different principle of electrostatic interaction. In the electrostatic driver, a thin moveable membrane – sometimes made of transparent Mylar – is stretched between two static elements called stators. The membrane is charged to a very high voltage with respect to the stators. The audio signal is applied to the stators, which create electrostatic fields around them that vary in response to the audio signal. The varying electrostatic fields generated around the stators interact with the membrane’s fixed electrostatic field, pushing and pulling the membrane to produce sound. One stator pulls the membrane, the other pushes it. The voltages involved in an electrostatic loudspeaker are very high. The polarizing voltage applied to the diaphragm may be as high as 10,000 volts (10kV). In addition, the audio signal is stepped up from several tens of volts to several thousand volts by a step-up transformer inside the electrostatic loudspeaker. The high voltages are necessary to produce the electrostatic fields around the diaphragm and stators. To prevent arcing – the electrical charge jumping between elements – the stators are often coated with an insolating material. Still, if an electrostatic loudspeaker is overdriven, the electrostatic field strips free electrons from the oxygen in the air, making it ionized; this provides a conductive path for the electrical charge. Large diaphragm excursions – i.e. a loud playing level – put the diaphragm closer to the stators and also encourage arcing. Arcing can destroy electrostatic panels by punching small holes in the membrane. Arcing is a great problem in humid climates than in dry climates because moisture makes the air between the stators more conductive. Electrostatic panels are often divided into several smaller panels to reduce the effects of diaphragm resonances. Some panels are curved to reduce the lobing effect (uneven radiation pattern) at high frequencies. Lobing occur when the wavelength of sound is small compared to the diaphragm. Lobing is responsible for electrostaatics’ uneven high-frequency dispersion pattern, which Stereophile magazine founder J. Gordon Holt has dubbed the vertical venetian-blind effect, in which the tonal balance changes rapidly and repeatedly as you move your head from side to side. Electrostatic panels are of even lighter weight than planar magnetic transducers. Unlike the ribbon driver, in which the diaphragm carries the audio signal current, the electrostatic diaphragm need not carry the audio signal. The diaphragm can therefore be very thin, often less than 0.001”. Such a low mass allows the diaphragm to start and stop very quickly, improving transient response. And because the electrostatic panel is driven uniformly over its entire area, the panel is less prone to breakup. Both the electromagnetic planar loudspeaker (a ribbon) and the electrostatic planar loudspeaker enjoy the benefits of limited dispersion, which means less reflected sound arriving at the listening position. Like ribbon loudspeakers, electrostatic loudspeakers also have no enclosure to degrade the sound. Electrostatic loudspeakers also inherently have a dipolar radiation patterns. Because the diaphragm is mounted in an open panel, the electrostatic driver produces as much sound to the rear as to the front. Finally, the electrostatic loudspeaker’s huge surface area confers an advantage in reproducing the correct size of instrumental images. In the debit column, electrostatic loudspeakers must be plugged into an AC outlet to generate the polarizing voltage. Because the electrostatic is naturally a dipole radiator, room placement is more crucial to achieving good sound. The electrostatic loudspeaker needs to be placed well out into the room and away from the rear wall to realize a fully developed soundstage. Electrostatics also tend to be insensitive, requiring large power amplifiers. The load impedance they present to the amplifier is also more reactive than that of dynamic loudspeakers, further taxing the power amp. Nor will they play as loudly as dynamic loudspeakers; electrostatics aren’t noted for their dynamic impact, power or deep bass. Instead, electrostatics excel in transparency, delicacy, transient response, resolution of detail, stunning imaging, and overall musical coherence. One great benefit of full-range ribbons and full-range electrostatics is the absence of a crossover; the diaphragm is driven by the entire audio signal. This prevents any discontinuities in the sound as different frequencies are reproduced by different drivers. In addition, removing the resistors, capacitors, and inductors found in crossovers greatly increases the full-range planar’s transparency and harmonic accuracy. Even hybrid planars put the crossover frequency between the dynamic woofer and the planar panel very low (below 800Hz, a frequency nearly an octave below the middle A), so there’s no discontinuity between drivers through mosty of the audible spectrum. Finally, the large diaphragms of electrostatic and ribbon drivers are gently driven over their entire surface areas, rather than forcefully over the relative small voice-coil area of a dynamic driver. This high force over a small area contributes to the dynamic driver’s breakup described earlier, a phenomenon less likely to occur with large planar diaphragms. |
cpsjj 正式會員 219.xxx.xxx.24 |
2006-09-14 21:49 |
| [#1357] Quad ESL we found the values on both left and right are same at 1.4K but sound is Ok with no hum???? -------------------------- Dennis......I cann't think of any reason why the reading in the bass panel is so low, The only possibility may be I should give the EHT block at least 10 to 15 minutes to charge up before I get the reading. I touch the HT probe to the terminal post to get the reading within a minute after I pluged in AC current yesterday. The EHT may need more time to get charge up to give me an accurate reading. CP......Donn't you think that? I am sure yr ESL57 is in perfect working condition now. If there is any leakage or low voltage in the panel, you will definitely notic it when you listening to yr music. Please leave yr ESL57 pluged in and continue to use it. I will check the voltage again next time on my visit. Regds |
Pcs100 正式會員 219.xxx.xxx.201 |
2006-09-15 08:37 |
| [#1358] Quad ESL Hi CP, did you mean Scott130 + 12.1 or QuadII is not up to your expectation? Rgds. |
rsbn589 正式會員 210.xxx.xxx.51 |
2006-09-15 09:15 |
| [#1359] Quad ESL CP and Edmond......I thought of the questions in Dennis' ESL57 last night. I am almost positive that his ESL got nothing wrong. There is a very high possibility that we obtained an inaccurate reading from the EHT, because we get the reading too quick (within one minute after we plug in). We should allow more time for EHT to charge up. May be at least 15 minutes. We are too anxious to get the queen singing. Regarding the question why One Thing Audio put a 10M resistor between the treble panel and the EHT block is beyond my comprehension. We'll find out from Steve of One Thing Audio. Just to let Dennis have peace of mind, we will check the voltage again on our next visit to his house. Regds |
Pcs100 正式會員 219.xxx.xxx.201 |
2006-09-15 09:27 |
| [#1360] Quad ESL Dear cp, Patrick, Edmond, jcml and limage and all, Thanks for sending regard to my OTA. She is now back to the stage. Per OTA's expert, the resistor value of 10M is normal but not written on manual. The 150K is another one hidden insider the audio transformer. The expert has some concern on the bass panel voltage and we will follow up next week to report the re-measurement. |
dkyyu 正式會員 218.xxx.xxx.231 |
2006-09-15 10:06 |
| [#1361] Quad ESL Hi all, that is fun keep doing experiment with Dennis ESL 57. Do you remember when you were in high school; the most interesting subject was the laboratory. Theoretically, the Tripler enhanced the voltage to several times of the AC 220V. It is without any loads. Therefore, the measurement of 1,400 V would probably right. |
Blue-Ray 正式會員 218.xxx.xxx.17 |
2006-09-15 10:20 |
| [#1362] Quad ESL Hi Ray, The voltage should normally be higher without any load. I have, however, little experience with ultra high voltages beyond 1K, I'd bette leave it to the experts. Anyone competent on the subject around? |
limage 正式會員 220.xxx.xxx.139 |
2006-09-15 11:29 |
