Amplifier: an electrical device that increases the magnitude and power of a signal before it is delivered to the transducer.

Current: a flow of electrons is called an electrical current, and represents the ability to generate power.

Distortion: additional, spurious signals that occur when a transducer is driven too hard.  Distortion is generally considered a negative artifact.

Frequency: how often the signal changes per second.  The lower the number, the lower the tone (bass tones).  High numbers are very bright (like a high pitched whistle).

IEM: In- Ear Monitor.  A headphone designed to reside mainly inside the ear structure and directly couple the output of the headphone into the ear canal.

Impedance: a measure of how an item resists a flow of current for a given voltage.  Voltage, current, and impedance are related by Ohm's Law (V = I * R).  Impedance can vary with frequency.

SPL: Sound Pressure Level.  A measure of the relative volume of a sound.  Higher numbers mean a louder sound.

Transducer: a small motor that generates SPL based upon an input signal from an amplifier.

Voltage: a measure of the electric potential of a signal.  As this signal is placed across an impedance, a current flows.  If current flow is not sufficient, then the voltage will drop down and distortion will result.
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