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The thing that makes the E17 "lowly" is that it only outputs about 250 mW into 16 ohms (Same as the $60 E7). The E17 is an absolutely wonderful device but the point is the amp section is not very powerful, and orthodynamics are HARD to drive. You want more than what the E17 can push. Orthodynamics don't sound their best without a good high current home amp. Portable amplifiers simply cannot get all the performance out of them.
The Fostex T50RP is plently loud out of an iPhone or other portable device, but doesn't sound worth a ****, especially when compared to how it sounds out of an Asgard. Orthos are a different technology; despite the fact that their specifications imply they don't need an amp, they really, truly do.
Additionally, I was NOT being condescending in any way. I was stating facts. This hobby is not for everyone, not by any means. Watch it.
The idea that "some people don't have the ears for it" implies that these people are largely oblivious to the things that audiophiles like us hear. I honestly do not think this is the case. Some people like us are
trained to hear music, meaning they are able to discern certain details or organize sound (ex: into bass, midrange, treble). But this doesn't necessarily mean others don't have the ears for it.... they hear it but don't think about it. Often, non-audiophiles have a better sense of the overall sound because they are not so focused on picking out certain aspects of the sound like we do - an organized perception of music. And even if we consider the fact that some people do have better hearing extension wise (ex: someone can hear above 22khtz), the person doesn't actually become more qualified to measure the HD555 vs HE-400. A lot of it just happens to be placebo... of course we'd expect a $400 headphone to sound downright superior. And yet in this hobby, this is rarely the case. Most of the time, no matter how much money you spend, you're going to get pros and cons out of headphones you purchase. It's all about matching preferences. This is why your comment sounded condescending, even if it wasn't meant to be condescending.
Please define power... if you increase the power delivered to the headphones, that will make them sound louder. If you switch from one amp to another that is capable of higher output power levels, you are also changing things unrelated to power. If you switch amps but do not change the volume, then you are not increasing power (delivered). For instance, if you're delivering 10 mW to headphones with one amp - capable of 100 mW output into that headphone - and 10 mW to headphones with another amp (capable of 4W output into that headphone), that is not increasing the power. You usually don't need amplifiers that can output levels far above that which is actually being used, unless we want to listen to something like the HE-6 at high listening volume.
Even if we consider the idea that more pricey amps have a good deal of audible improvement over an E17, it's questionable whether this audible improvement would actually make that big of a difference. TC will probably have the same opinion regarding HD555 vs HE-400. Like I said before, I think the main problem here is that TC isn't listening to genres that would favor HE-400 in favor of HD555. My Mad Dogs absolutely cannot compete with the HD598 when it comes to classical music tracks (very low dynamic range, lacking natural timbre) but for other genres of music such as dubstep or hip hop, its darker presentation (or well neutrality) suits it much better.