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发表于 2017-7-5 12:27
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来自 山东省青岛市
本帖最后由 gebegebe 于 2017-7-5 12:28 编辑
HD800等耳机在设计时就是以0输出阻抗设计的，看到的森海工程师的原话。阻抗匹配可以由玩家自行选择搭配。
- 森海塞尓的答复：
耳放阻抗 0~10欧之内即可，否则低音会过量。森海塞尓的耳机是基于0内阻放大器设计的。
- Hi,
I call Sennheiser (Germany) about in IEC61938 recommand 120 Ohm.
Sennheiser tells me that a good headphone amp for Sennheiser headphones should be have an output resister from 0 ... 10 Ohm - otherwise the bass will rise.
另一个答复
I remember Jan Meier has visited the Sennheiser factory quite a few times and they told him that the Sennheisers are designed to sound as intended with an amp as close to zero ohm output as is possible.
- 来自AKG的答复
AKG的耳机是为低阻抗放大器打造的，如K701，即不遵循120 ohm规则，但是，如果一定要用120欧的电流驱动，问题也不大，因为K701的频响-阻抗曲线比较平缓。
Karl Peschel is in semi-retirement - anyhow he answer
K701 are constructed for low impedance output amplifiers.
But the rise of impedance at the resonance frequency is unincisive, so the effect to the sound is low.
The K701 works good (without diversification in sound) with all the current headphone-jack output-impedance
- GRADO 的观点：
RA-1已经说明了GRADO 的耳机是基于 0内阻耳放设计的。
- 拜亚动力对120欧耳放阻抗的观点
拜亚 DT880在耳放输出阻抗为250欧时频响最平坦，建议耳放输出阻抗在200~250欧， 120ohm勉强可用，但是零输出很不合适。
Whoah! Been on the phone to Beyer for 30 minutes, phoned up to ask them "what impedance?" and the guy went into some seriously mind boggling stuff which went totally over my head! He was talking so fast and so passionately I just couldn't digest it!
Basically Beyer say the optimal output impedance of an amp using their DT-880 is 250 ohm. This will give you the flattest response, plugging them into the 16 ohm output of an ipod will not do them any favours but will result in a more unnatural (yet pleasing sound) He described it as the classic smiley face response with bass up mids down and treble up.
He went on to say that some of the competitors design their headphones to sound like this... for flattest response with DT880, however, 250ohm is the desired output impedance.
He explained that impedance is not everything we are also taking the materials, the loading, the enclosure into equation... closed, open, semi open. Impedance should only be considered a rough starting point and as the 'phones are to be used in domestic situations trade offs must be expected but for optimum performance, if you use Beyer DT-880 / DT-770, DT-990 then your amp output impedance should be 200 - 250 ohm.
I really wish the guy had been talking slower as he was giving out some VERY interesting stuff! I didn't have a pen handy so couldn't take notes. He did say that no way is 0 ohm suitable for beyer 'phones.... 120ohm is marginal but 200 - 250 ohm optimal for the most honest reproduction.
拜亚技术支持的另一个人的回复，认为120ohm可用
Further to the Beyer tech guys 250ohm recommendation for the DT-880 / 770 / 990 somebody else has sent me the following:
"Dear Mike,
Many thanks for your email and apologies for the delay in replying. In most applications we would recommend an amp with an output driving impedance of 100 ?120 ohms to drive most of our headphones.
We currently offer our new A1 headphone amplifier - http://www.beyerdynamic.de/cms/Headphone....uctdatabase_pi1[showUid][showUID]=1876&tx_sbproductdatabase_pi1[showUid][backPID]=108&cHash=b11daed01b and this offers a headphone output impedance of 100 ohms.
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