Aby miały jakikolwiek sens i wartość utylitarną a nie tylko sugestywną i literacką...
Moim zdaniem np. tak:
>>First things first: I’m not going to look for differences in sound quality where there aren’t any. I leave the placebo and make-believe to others – there are enough people out there who use lots of flowery words for describing sonic traits that don’t even exist, or sound exactly the same on all other amps available (except the ones that aren’t good… or tube amps, which sound different by design). A good amp is a good amp is a good amp – it sounds neutral, has a linear frequency response, low distortion, low noise floor, good channel separation, and other factual constants. These aspects often change depending on the headphones attached to the amp; they’re dependent on impedance, sensitivity, and other variables. All in all, there is negligible difference between good amps, they do not have a characteristic ‘sound’ – if they would, they’d be no good amp.
This being said, the E7 is a good amp with almost any headphone attached. As most portable amps do, it hisses a bit with overly low impedance and highly sensitive phones, but less than many other amps do. FiiO’s own E5 hisses about as much as the E7, the E3 hisses a lot more – but it can be forgiven, considering its $8 price tag. Either way, as soon as you get a bit above approximately 32 Ohm impedance and/or below 115dB/mW sensitivity, the E7 becomes dead silent and ‘black’.
I’ve mostly compared the E7’s USB performance to the headphone output of my Echo AudioFire 4 sound adapter, and its analog performance to the Sansa Clip’s headphone output in listening tests. Both can be seen as very solid real-world benchmarks in their particular field of application.
The only real, noticeable issue with the sonic performance of the E7 to my ears is that it could have a bit better stereo channel separation, also known as crosstalk. While in portable use it’s about the same as most MP3 players (except some Sony models, the iPhone 3G, and maybe a few others which have above average crosstalk behavior), when compared to my AudioFire’s headphone-out, the E7 is somewhat narrower, more congested in its stereo imaging. But that’s pretty much the only thing that’s not so high quality as far as audio reproduction goes. It’s only really apparent in a direct comparison; it’s certainly not a huge flaw in my opinion. Other than that, the E7 performs very well. My RMAA results pictured above show some irregularities with distortion and noise when the E7 is used in USB mode with low impedance phones, but I couldn’t really hear anything detrimental concerning that matter with my own ears, compared to when the E7 is used via the analog input.
Another praiseworthy matter is that the E7 drives my 300 Ohm Sennheiser HD 650 phones just fine. A lot of misinformation and legends have been spread by ‘audiophiles’ about these phones. While they’re certainly not the most suitable to be used directly on most MP3 players, they are not that overly hard to drive and they don’t need a super-powerful amp, as is often claimed. The HD 650 sound pretty much the same driven by the FiiO E7, the AudioFire 4, as well as my overly beefy tube amp, the Woo Audio 6 (which adds nice harmonic distortions, but doesn’t drive the HD650 any ‘better’ than the other ones, in the grand scheme of things).
All in all, the FiiO E7 performs well with about any phone you throw at it. Personally, I’m really picky about even the tiniest bit of background hiss, so I wouldn’t use the E7 with very difficult to drive high-efficiency IEMs like the Ultimate Ears UE11, Shure SE530, Sennheiser IE8, and similar ones – but I really like how the E7 performs with my Phonak PFE, Hifiman RE0, Ultrasone HFI-780, and, as already said, even the Sennheiser HD 650.<<
Za
http://www.anythingbutipod.com/archives/2010/03/fiio-e7-headphone-amplifierusb-dac-review.phpJeśli ktoś ma inne zdanie, zapraszam do dyskusji
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