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Q
The ratio of reactance to resistance in a series circuit, or the ratio of resistance to reactance in a parallel circuit.
Qes
The Q of a speaker driver at its free air resonance considering only its electrical losses.
Qms
The Q of a speaker driver at its free air resonance considering only its mechanical losses
Qtc
The total Q or resistance of a woofer and sealed enclosure at the systemâ€™s resonance frequency, considering all resistive losses. A Qtc of .7 has smoothest response and the lowest resonant frequency response. A Qtc of above 1.1 should only be used by those who prefer a "boomy" response.
QTS
The total resistance in a series or parallel circuit. This takes into account all Driver resistances, both electrical and mechanical.
Quick Release (terminal)
A means for securing a wire conductor to a terminal connector that permits easy attachment and removal. In the usual form, this will involve a springloaded clip, which needs only to be pressed to either secure or detach a cable end.
Quantization
The process of converting, or digitizing, the almost infinitely variable amplitude of an analog waveform to one of a finite series of discrete levels. Performed by the A/D converter.
Quantization error
Error resulting from quantizing an analog waveform to a discrete level. In general the longer the word length, the less the error.
QuasiParametric
A type of equalizer. A quasiparametric (also known as "semiparametric") EQ will allow control over the frequency and gain of each band of equalization, but not the number of frequencies controlled (bandwidth). The midrange EQs on mixing consoles are often quasiparametric. More flexible in some ways than a graphic EQ, a quasiparametric EQ does not offer the full range of adjustment found in a fully parametric design.
Quiescent Current
The term given to describe the amount of current consumed by a circuit when it is not performing any work (sometimes referred to as standby current).
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