با توجه به بالاتر گرفتن قضيه آمپ، فكر كنم مفيده پيام خصوصي جناب shigzeo رو به طور كامل بزارم اينجا، مفيده، وقت خاصي هم نمي گيره خوندنش، يكجورايي گلايه هاش از وضعيت هدفايي و كاربرها، شبيه وضعيت خودمونه يجورايي ( ايشون بيشتر ريويو هاش رو اينجا ميزاره
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سوال من::heart banger-97
hello!
I have a question that I haven't found an accurate answer for it
does ex1000 need an amp to be completely driven? or using an amp is a matter of coloring the sound?
thanks
Shigzeo:
Hello heart (leaving off the rest as it is long.... but not as long as this salutation)
Well met. You have asked a difficult question, not because the answer is difficult, but because at headfi, the answer is 'yes', even if actual performance when attached to an amp, may suffer. At headfi, actual performance is auxiliary to appearance, expectation, and faith. It really depends on your source. If you are using an iPod/other MP3 player from say, 2005, then the easy answer would be 'yes'.
However, you have to look at the amp. There are dozens if not hundreds of amps out there that cannot properly drive earphones. In fact, most of them may drive your earphones worse than your player does- if your player is relatively new.
Today's iPods are not perfect, but they deliver good voltage and current to earphones. In fact, today's Nano 7G is pretty amazing. It will deliver distortion-free signal to almost any earphone even at loud listening volumes. Why? It's output impedance is low enough that strong current (necessary for clean signals) can be pushed into any earphone. With loads of voltage at its behest, it gets loud. (Not that loud is good. Please be careful of your hearing. Any volume over 50% is probably damaging to your hearing in the long run.)
A Dx100 does not need an amp, ever. Ditto the X3 from Fiio. There are certain instances where a good amp (low Ω, good voltage) may help. Sometimes, as in the case of the Fiio X3, output noise is pretty high. Some amps (very few indeed) will have lower output noise than the source you carry. You can use them to attenuate that noise.
NOTE: an amp will NEVER outperform the source. It is impossible. The best an amp can do is ALMOST match the output. If you plug your source from a good line out (there are a number of very bad line outs out there) into a good amp, it will perform nearly up to, but never perfectly matching the output of the source. A bad line out will make the amp perform poorly.
If you have a poor source: Cowon D2, older iPod, Sony Walkman that can't hold signal with low Ω earphones (especially non-dynamic driver earphones), a good amp will help. Where the source loses resolution and body in the bass, the amp will restore it. Where distortion spikes, the amp will smooth it. The reason for this is that the amp becomes a null load. The load is shouldered 100% by the amp. The player sees its headphone output as completely free and just spits music out without hindrance.
In that respect, an amp will always help. An unloaded source will perform its best. But the amp has to be up to snuff. The EX1000 isn't a terribly hard earphone to drive for today's equipment. If it was me who faced down the quandary, I'd think like this:
1. Is my source a POS?
2. Would an amp actually help the output quality?
3. How much $$$ can I spend?
Then I'd decide.
If yes to 1 and 2, then sure, why not? Otherwise, starting over with a better source (selling the one I had and getting a nano 7G or something) is more cost/size effective. But... in headfi, you don't get street cred for going naked (without amp). Here, you are a better audiophile if you carry crazy kits.
If you were to pick up an amp, an iBasso TxD series is perfect: very low Ω outputs, low noise floors, and plenty of voltage. They cost about 100-150$, the battery lasts forever, and they are small. I have the T3D from several years ago and swear by it.
But do know: no amp can ever ever every outperform what comes into it. If the line out/headphone out of your source is crap, that is what the amp will read.
I go naked: iPod nano 6G (not great, but not bad), iPod shuffle 512mb (from 2005), Fiio X3, DX100. Mostly, I use the iPods as they are easier to use, have better life, and generally have the lowest noise floors (though the DX100 is silent). I use: ToGo!334 (hard to drive), Parterre (ditto), Grado GR8 (easy), FitEar SM64 (soso) etc. When testing things, I make sure to use as high spec/quality as possible, but for enjoying music, if your source is half decent, the difference (real difference) is minimal when compared to a good line out connected to a good amp.
Remember, just having an amp isn't good enough. There are loads of amps that perform way worse than their sources. Some people swear by them. That just shows one thing: that they don't care about actual signal fidelity. They are accessory hunters who like the 'sound' of their equipment in all its aberrational forms.
I'm sorry this was so long.
shigz
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