Operating instructions

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Typically, OE types exhibit sensitivities of about 100dB/mW, whereas IE devices can be
10dB higher or more, e.g., 110dB/mW. Assuming a 10dB difference, the lower sensitivity
OE headphones require ten times more power to achieve the same volume as the IE type. If
you’re using OE headphones, you’ll appreciate the NuForce Icon Series’ power capability.
Your headphones will sound clearer and more natural. If you use IE headphones, owing to
their higher sensitivity, you may notice a small amount of background noise. Conversely,
you will hear weak signals more readily than would be the case with lower-sensitivity OE
types.
We are not discussing a product defect. Electrical noise arises from many factors, one of
which is the amount of amplification the Icon product provides. Irrespective of type or
design, electrical circuits introduce noise. If the device amplifies the signal, the noise
coming into it will likewise be amplified. Further, the amount the device itself creates will
also be greater. These are facts of electrical life that good design can mitigate. In the case of
IE headphones, noise can be minimized or all but eliminated by reducing the amplifier’s
gain. But to do that, the advantage the amp offers to OE headphone users would be
sacrificed. Performance benefits for one type of product diminishes those of the other. As
always, effective engineering requires compromise..In this regard, the NuForce Icon Series
of products offer good, real-world solutions. Noise will be low in some cases, and in others,
quite imperceptible. Most importantly, OE headphone users will benefit from the power
they require.
For further reading: http://www.nuforce.com/hp/support/icon-hdp-noisefloor.php