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Analog Connections
You need only connect headphones to your NuForce device’s headphone jack
and adjust for volume with the unit’s volume control. If connecting to an
external amplifier or stereo receiver, you will require a quality stereo
interconnect with a standard male RCA connector for plugging into the NuForce
device and an appropriate connector at the other end (usually, an RCA).
Note on Headphone Use
Headphones present a challenge to amplifier designers. There are two basic
types: the over-ear (OE) in general use in the recording industry and the smaller
in-ear (IE), a.k.a. ear-bud, commonly used with portable devices such as MP3
players. Given the range of available OE and IE headphones, in attempting to
deal with all of them, your computer’s headphone output is optimized for none.
Your NuForce Icon product will make a world of difference.
The reason is simple enough. Various OE and IE phones cover an expanse of
electrical impedances from 16 to 600 Ohms and differ in other significant ways.
Sensitivity is a term that expresses how loud the headphones will play at a given
amount of electrical power, e.g., x number of decibels per milliwatt (0.001 watt)
of power, expressed as xxxdB/mW.
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
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