Glossary: Impedance | Sweetwater.com

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Impedance: Measured in ohms, impedance refers to the resistance of a circuit or device to AC (alternating current). Such an AC circuit could be any two audio devices connected together, like a speaker and an amp, passing audio signals. All other things being equal, more power (watts) will flow through a speaker with a low impedance than one with a high impedance. This will also put a greater strain on the amplifier to try to produce this power. If the impedance is too low your amp will not be able to handle it and bad things will happen. Most modern electronic audio devices have extremely high input impedances so they can be driven by very low power outputs. This is one of many reasons why high quality audio equipment can be built so much less expensively these days.

I/O	IAC	Interaural Cross Correlation (IACC)
IC	Icon	IDC
IDE	Idiophone	IEC
IEC958	IEC958 Part-3	IEC958 Part-4
IEEE	IEM	IEM
IF	II-V Progression	IIR Filter
iLok	Image Copy	Image File
Image frequency	Imaging	Intermodulation Distortion (IMD)
iMIDI	Impedance	Impedance Balancing
Import	Impulse	Impulse Response
In-Line Monitoring	Inductance	Inductor
Inertia Block	Infantile Failure - (a.k.a. infant failure mode)	Infrasonic
Initialize	Inlay	In Line Mixer
Input Sensitivity	Insert	Installer
Instantiate	Insulator	Intellectual Property
Intelligibility	Intensity stereo	Inter-Application MIDI
Interaural Intensity Difference (IID)	Interaural Intensity Difference (IID)	Interaural Phase Differences (IPD)
Interaural Time Difference (ITD)	Interface	Interlace
Interleaved Stereo	Interleaving	Internet
Interpolate	Intersymbol Interference	Interval
Interval	Intonation	Inverse Square Law
Inversion	Inverter	IP (Internet Protocol)
IPS	Interrupt/Interrupt Request (IRQ)	ISA
ISDN	ISO	ISO 9660
Isochronous	Isolation Booth	Isolation Transformer
ISP	ISRC	ISRC
ITD	ITU-T	ITU 775 Surround