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Car Audio Technical Help-Home-Stereo Technical Information- Glossary Of Technical Terminology-General Speaker Information-Choosing Speakers-About Woofers-About Midrange Speakers-About Tweeters-About Dual-Cone / Full Range / 2 and 3-way Component Speakers-About Capacitors-About Crossovers-About Equalizers-About Enclosures/Boxes-About Theile-Small Parameters-About Amplifiers-How To Install An Amplifier-Understanding Power Ratings-About Receivers/Head Units-Installing A Receiver-Installing LED/Neon Lighting-Choosing  The Right Tools-Technical FAQ Learn About Car Stereo Power Capacitors Learn About Choosing Car Stereo Speakers Learn About Car Stereo Amplifiers Learn About Car Stereo Theile Small Parameters Learn About Car Stereo Crossovers Learn About Car Stereo Tweeters Learn About Car Stereo Midrange Speakers Learn About Car Stereo Noise Reduction Learn About Car Stereo Speakers Learn About Car Stereo Power Ratings Learn About Car Stereo Head Units Receivers Learn About Installing Car Stereo Receivers Head Units Learn About Car Stereo Equalizers Learn About Car Stereo Two-Way Speakers - Three-Way Speakers - Four-Way Speakers Learn About Car Stereo Dual Cone & Cual Coil Speakers Learn About Car Neon Lights & Installation Learn About Car Stereo Enclosures Woofer Boxes Learn About Car Stereo Tools Learn About Car Stereo Woofers Learn How To Install A Car Stereo Amplifier Glossary of Car Stereo  Electtronics Terminology Learn About Car Stereo Frequently Asked Quesitons Home Stereo Technical Information and Advice About Power Suppplies Links To Stereo Electronics Manufacturers Websites

Glossary of Technical Terms

A - B - C - D - E - F - G - H - I - JK
L - M - N - O - P - Q - R - S - T - U
V - W - XYZ

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 systemas 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 spring-loaded 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.

Quasi-Parametric
A type of equalizer. A quasi-parametric (also known as "semi-parametric") 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 quasi-parametric. More flexible in some ways than a graphic EQ, a quasi-parametric 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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