Weak current College】 【speakers the physical meaning of frequently used parameters.

<br> Speaker parameter refers to the use of dedicated speaker test system for testing out of the speakers on a variety of specific performance parameter value. commonly used parameters include: Z, Fo, η 0, SPL, Qts, Qms, Qes, Vas ., Mms, Cms, Sd, BL, Xmax, Gapgauss. the following are the parameters of its physical meaning. <br> <br> 1.1Z: refers to the speaker of the resistance value, including: rated impedance and DC impedance. ( .Unit: ohm / ohm), usually a rated impedance loudspeakers rated impedance Z: is the impedance curve first great value followed by the minimum impedance mode value, which is shown in Figure 1, the point B impedance value. it is the benchmark for calculating .speakers power-DC impedance DCR: refers to the rest of the voice coil windings, pass to DC signals, and tested impedances value. we commonly referred to as 4 'or 8' refers to the nominal impedance. <br> <br> 1.2 .Fo (lowest resonance frequency) refers to the speaker impedance curve at a great value for the corresponding frequency. Unit: Hertz (Hz). the speaker impedance curve is a speaker in the normal operating conditions, with constant current or constant pressure measured by speaker .impedance mode value change frequency curve. <br> <br> 1.3 η 0 (speaker efficiency): refers to the speaker output sound power and input power ratio. <br> <br> 1.4SPL (sound pressure level): refers to the .loudspeaker in the pass to rated impedance voltage of power 1W, in the reference axis and Horn width point apart of acoustic pressure. Unit: decibels (dB). <br> <br> 1.5Qts: total quality speakers for numeric values. <br .> <br> 1.6Qms: speakers of the machinery quality for value. <br> <br> 1.7Qes: speaker power quality for value. <br> <br> 1.8Vas (Horn of effective volume): refers to the enclosed in .a rigid container air compliance and speaker unit compliance equal volume. Unit: liters (L). <br> <br> 1.9Mms (vibration quality): refers to the speaker in motion in the quality of the various parts of vibration combined, including .drum paper section, voice coil, elastic wave as well as in the vibration of air quality, etc. Unit: g (gram). <br> <br> 1.10Cms (lishun): refers to the speaker vibration systems supporting part of compliant ., the greater their value., speaker of the whole system more soft. Unit: mm / Newton (mm / N). <br> <br> 1.11Sd (vibration): refers to the speaker vibration, drum and paper / diaphragm of .effective vibration area. Unit: square metres (m2). <br> <br> 1.12BL (magnetic): gap magnetic induction and effective product of the voice coil cord length-units: (T * M). <br> <br .> 1.13Xmax: voice coil in vibration during movement of linear stroke. Unit: mm (mm). <br> <br> 1.14GapGauss: gap magnetic values. Unit: Tesla (Tesla). <br> <br> <br> .<br> <br> <br> <br>.