Microbuzzer.com · Posted on 20-07-2010 by microbuzzer

Parameters of the speaker is the speaker using a dedicated test system for testing out various performance parameters of the speaker specific values.

The common parameters include: Z, Fo, η 0, SPL, Qts, Qms, Qes, Vas, Mms, Cms, Sd, BL, Xmax, Gap gauss.
Z: is the speaker’s resistance, including: Rated impedance and DC resistance. (Unit: ohms / ohm), usually refers to the rated impedance.

Speaker’s rated impedance Z: impedance curve shall be behind the first maximum of the minimum impedance modulus, which is the benchmark for calculating electric power speaker.

DC Resistance DCR: is the coil in the voice coil under static conditions, through a DC signal, and test out the impedance. We usually say 4 or 8 ohms Europe is rated impedance.

Fo (the lowest resonance frequency): is the speaker impedance curve of the first maximum corresponds to the frequency. Unit: hertz (Hz).

Speaker is the speaker impedance curve under normal working conditions, using constant current method or the constant pressure method measured speaker impedance modulus versus frequency curves.

η 0 (speaker efficiency): refers to the speaker voice output and input power ratio.

SPL (sound pressure level): is the speaker impedance in the pass to the rated voltage of 1W of electrical power when the reference axis with the speaker’s point 1m away from the sound pressure generated. Unit: decibels (dB).

Qts: total quality speaker for value.

Qms: Speaker of the mechanical quality factor values.

Qes: with speaker quality factor values.

Vas (speaker of the effective volume): refers to the rigid airtight container in the air along with the speaker sound unit of volume equal voice along. Unit: liter (L).

Mms (vibrating mass): is the speaker in the movement, the quality of parts involved in the sum of vibration, including paper, some drums, voice coil, spider and participation in air quality such as vibration. Unit: g (gram).

Cms (force along): refers to the speaker vibration system support components of the supple degree, the greater its value, the speaker of the vibration system more flexible, unit: mm / Newton (mm / N).

Sd (vibration area): refers to the process of vibration in the speakers, drum paper / diaphragm effective vibration area, unit: square meter (m2).

BL (magnetic): gap magnetic flux density and the product of the effective coil length, unit: (T * M).

Xmax: Voice coil movement in the course of the linear vibration stroke unit: millimeter (mm).

Gap Gauss: gap magnetic flux density value, unit: Tesla (Tesla).

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