The following test is for the Airborne FR151B8-22F which can be purchased from Solen here. At the time of this test, the MSRP is approximately $69CAD ($67USD).

**Thiele-Small Parameters**

Electrical Parameters | |||

Re | 6.27 | Ohm | electrical voice coil resistance at DC |

Krm | 0.0214 | Ohm | WRIGHT inductance model |

Erm | 0.5 | WRIGHT inductance model | |

Kxm | 0.0493 | Ohm | WRIGHT inductance model |

Exm | 0.39 | WRIGHT inductance model | |

Cmes | 353 | µF | electrical capacitance representing moving mass |

Lces | 26.44 | mH | electrical inductance representing driver compliance |

Res | 62.31 | Ohm | resistance due to mechanical losses |

fs | 52.1 | Hz | driver resonance frequency |

—————— | |||

fm | 32.6 | Hz | resonance frequency of driver with additional mass |

Mechanical Parameters | |||

(using add. mass) | |||

Mms | 9.59 | g | mechanical mass of driver diaphragm assembly including air load and voice coil |

Mmd (Sd) | 9.217 | g | mechanical mass of voice coil and diaphragm without air load |

Rms | 0.436 | kg/s | mechanical resistance of total-driver losses |

Cms | 0.973 | mm/N | mechanical compliance of driver suspension |

Kms | 1.03 | N/mm | mechanical stiffness of driver suspension |

Bl | 5.212 | N/A | force factor (Bl product) |

Loss factors | |||

Qtp | 0.695 | total Q-factor considering all losses | |

Qms | 7.2 | mechanical Q-factor of driver in free air considering Rms only | |

Qes | 0.725 | electrical Q-factor of driver in free air considering Re only | |

Qts | 0.659 | total Q-factor considering Re and Rms only | |

Other Parameters | |||

Vas | 3.145 | l | equivalent air volume of suspension |

n0 | 0.059 | % | reference efficiency (2 pi-radiation using Re) |

Lm | 79.91 | 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 | 4.83 | % | root-mean-square fitting error of driver impedance Z(f) |

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

Madd | 15.34 | g | additional mass |

Sd | 47.78 | cm² | diaphragm area |

**Large Signal Analysis**

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

X Bl @ Bl min=82% | 2.8 | mm | Displacement limit due to force factor variation |

X C @ C min=75% | 3.7 | mm | Displacement limit due to compliance variation |

X L @ Z max=10 % | >4.6 | mm | Displacement limit due to inductance variation |

X d @ d2=10% | 20.2 | mm | Displacement limit due to IM distortion (Doppler) |

Asymmetry (IEC 62458) | |||

Ak | -2.28 | % | Stiffness asymmetry Ak(Xpeak) |

Xsym | -1.23 | 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**