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The Effect of Amplification on IEM Performance

post #1 of 3
Thread Starter 
Since my joining head-fi 10 months ago, it has long been an article of faith that the purpose of introducing amplification into the signal path was only partially for the purpose of increasing the volume. During that time, I have heard described the potential of an amp to tighten the bass, widen/deepen the soundstage, warm or otherwise color the sound, etc, etc.

Even with the growing popularity of custom IEMs, there has been only limited discussion of the effect of amplification on their sound. In fact, what little consensus there seems to be is that the sound of IEMs doesn't particularly benefit from an amp.

That doesn't make sense to me. If, indeed, an amp is only secondarily about increasing volume (at least with low impedence headphones), why shouldn't an amp be capable of bringing to IEMs the sorts of sonic advantages they bring to traditional headphones?

I lack the experience to offer a reliable judgment on the issue. Having said that, I seem to be able to detect a substantial difference running my UE-5cs amped v. amped (using an inexpensive cmoy). Adding the amp seems to really "fatten" the sound. When I take the amp out of the loop, the UE-5cs seem much more lean/thin sounding. BTW, my A-B test was done going line out of an iPod with music ripped at 192 AAC.

I would appreciate those more knowledgeable than me to offer their thoughts.
post #2 of 3
I can't give you a technical/scientific explanation, but I can say what I've experienced.

I originally had a pair of Ety 4P's that I absolutely loved, I still think they're one of the best purchases I've ever made on anything. I then got the DIY bug and started to build a few amps with Tangent's boards, including building a little 2x9V job for my own use with my 3G iPod.

To my mind it definitely improved the sound, I probably noticed it quite a lot since I'd used my earphones for a good hour or so a day for around 10 months. The sound (as you mentioned) just became a lot fuller, the slightly non-impactful performance of them was given a bit more grunt.

However, my cat then got hold of them and I couldn't wait to send them to the US to be sorted so I bought a pair of Shure E5s (couldn't help trying them out) on the basis I'd sell the Ety's once fixed (they're still sitting waiting to be sent incidentally, a good 6/7 months later).

Anyway, I've found that with the E5s I didn't really notice any great improvement in sound, certainly not as much as with the Etys. This was a little weird to my mind because everything I'd read so far had been that the E5s were technically speaking the ones that would benefit most from a separate amplifier.

Saying that I've not really had a chance to amp the E5s very much, I lost my MINT and I've yet to find time to put another one together, so I may pick up on things with a bit more time, but my immediate reaction was that it probably didn't add a great deal.
post #3 of 3
I believe that custom IEMs offer terrific sound as it should be expected for the prices they fetch. Adding a headphone amplifier only serves to color the sound to your preferences because you are introducing another component to the signal chain. So, the sound signature of whichever custom IEM you own does not inherently change but it does get influenced by the specific headphone amplifier that you hook it up to. In essence, you are listening to your source as it is interpreted by your headphone amplifier.

Having said that, the addition of a headphone amplifier still follows one of the maxims of Headphone HI-FI: synergy. I have found that balance through checks and balances is important to creating system synergy. The Ue-10 PRO is very neutral and uncolored. It sounds pristine with the Apple iPod: clean, clear, neutral, and open. However, I don't care for that sound for too long. It gets to be too boring. So, the Ray Samuels Emmeline HR-2 adds a spicy darkness and warmth to the sound. It does not necessarily "fill out" the sound as it makes it more palatable for some ears.

I think that I am striving for the Golden Age of HI-FI Sound: warmth, richness, roundness of notes, and sparkling clarity along with an intimate allure of sound. However, my approach has not been to try to emulate that sound with cutting edge modern day technologies. I think I am succeeding because the Emmeline HR-2 and Ue-10 PRO have good synergy and balance.
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