The following test is for the Airborne FR124B8-19F which can be purchased from Solen here. At the time of this test, the MSRP is approximately $51CAD ($50USD).

**Thiele-Small Parameters**

Electrical Parameters | |||

Re | 7.24 | Ohm | electrical voice coil resistance at DC |

Le | 0.203 | mH | frequency independent part of voice coil inductance |

L2 | 0.25 | mH | para-inductance of voice coil |

R2 | 2.11 | Ohm | electrical resistance due to eddy current losses |

Cmes | 208 | µF | electrical capacitance representing moving mass |

Lces | 18.19 | mH | electrical inductance representing driver compliance |

Res | 65.52 | Ohm | resistance due to mechanical losses |

fs | 81.8 | Hz | driver resonance frequency |

—————— | |||

fm | 53.6 | Hz | resonance frequency of driver with additional mass |

Mechanical Parameters | |||

(using add. mass) | |||

Mms | 5.573 | g | mechanical mass of driver diaphragm assembly including air load and voice coil |

Mmd (Sd) | 5.411 | g | mechanical mass of voice coil and diaphragm without air load |

Rms | 0.409 | kg/s | mechanical resistance of total-driver losses |

Cms | 0.679 | mm/N | mechanical compliance of driver suspension |

Kms | 1.47 | N/mm | mechanical stiffness of driver suspension |

Bl | 5.176 | N/A | force factor (Bl product) |

Loss factors | |||

Qtp | 0.697 | total Q-factor considering all losses | |

Qms | 7.006 | mechanical Q-factor of driver in free air considering Rms only | |

Qes | 0.774 | electrical Q-factor of driver in free air considering Re only | |

Qts | 0.697 | total Q-factor considering Re and Rms only | |

Other Parameters | |||

Vas | 0.7183 | l | equivalent air volume of suspension |

n0 | 0.049 | % | reference efficiency (2 pi-radiation using Re) |

Lm | 79.09 | dB | characteristic sound pressure level (SPL at 1m for 1W @ Re) |

Lnom | Zn missing | dB | nominal sensitivity (SPL at 1m for 1W @ Zn) |

rmse Z | 6.39 | % | root-mean-square fitting error of driver impedance Z(f) |

Series resistor | 0 | Ohm | resistance of series resistor |

Madd | 7.73 | g | additional mass |

Sd | 27.34 | cm² | diaphragm area |

**Large Signal Parameters**

Displacement Limits | thresholds can be changed in Processing property page | ||

X Bl @ Bl min=82% | 2.4 | mm | Displacement limit due to force factor variation |

X C @ C min=75% | 2.8 | mm | Displacement limit due to compliance variation |

X L @ Z max=10 % | 3.5 | mm | Displacement limit due to inductance variation |

X d @ d2=10% | 14 | mm | Displacement limit due to IM distortion (Doppler) |

Asymmetry (IEC 62458) | |||

Ak | -9.27 | % | Stiffness asymmetry Ak(Xpeak) |

Xsym | -0.11 | mm | Symmetry point of Bl(x) at maximal excursion |

**Frequency Response**

The following measurement result is a result of merging nearfield response with farfield at 2.83v/1m to illustrate a standard 2.83v/1m measurement.

**Harmonic Distortion at 96dB/1m**