Mobile Electronics Glossary of Terms and Definitions - Q
| Mobile Electronics Glossary - Q |
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Q - The relative damping of a loudspeaker |
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Q Parameters - "Qms, Qes, and Qts are measurements related to the control of a transducer's suspension when it reaches the resonant frequency (Fs). The suspension must prevent any lateral motion that might allow the voice coil and pole to touch (this would destroy the loudspeaker). The suspension must also act like a shock absorber. Qms is a measurement of the control coming from the speaker's mechanical suspension system (the surround and spider). View these components like springs. Qes is a measurement of the control coming from the speaker's electrical suspension system (the voice coil and magnet). Opposing forces from the mechanical and electrical suspensions act to absorb shock. Qts is called the 'Total Q' of the driver and is derived from an equation where Qes is multiplied by Qms and the result is divided by the sum of the same.
As a general guideline, Qts of 0.4 or below indicates a transducer well suited to a vented enclosure. Qts between 0.4 and 0.7 indicates suitability for a sealed enclosure. Qts of 0.7 or above indicates suitability for free-air or infinite baffle applications. However, there are exceptions! The Eminence Kilomax 18 has a Qts of 0.56. This suggests a sealed enclosure, but in reality it works extremely well in a ported enclosure. Please consider all the parameters when selecting loudspeakers. If you are in any doubt, contact your Eminence representative for technical assistance." |
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Qa - The system's Q at Fb, due to absorption losses; dimensionless |
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Qec - The system's Q at resonance (Fc), due to electrical losses; dimensionless |
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Qes - The driver's Q at resonance (Fs), due to electrical losses; dimensionless. "A measurement of the control coming from the speaker's electrical suspension system (the voice coil and magnet). Opposing forces from the mechanical and electrical suspensions act to absorb shock." |
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Ql - The system's Q at Fb, due to leakage losses; dimensionless |
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Qmc - The system's Q at resonance (Fc), due to mechanical losses; dimensionless |
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Qms - The driver's Q at resonance (Fs), due to mechanical losses; dimensionless. "A measurement of the control coming from the speaker's mechanical suspension system (the surround and spider). View these components like springs." |
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Qp - The system's Q at Fb, due to port losses (turbulence, viscousity, etc.); dimensionless |
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Qtc - The measurement of a speaker and enclosure working together as one. The system's Q at resonance (Fc), due to all losses; dimensionless |
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Qts - The measurement of the speaker as a motor taking into consideration all mechanical and electrical losses. The driver's Q at resonance (Fs), due to all losses; dimensionless. "The 'Total Q' of the driver and is derived from an equation where Qes is multiplied by Qms and the result is divided by the sum of the same." |
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Quantization - The assigning of values to discrete samples of a continuous signal in the analog to digital conversion process. |
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