Airborne FR151B8-22F

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).


IMG_6401 IMG_6403 IMG_6404


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

Airborne FR151B8-22F Magnitude of electric impedance Z(f)

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

Airborne FR151B8-22F Force factor Bl (X) Airborne FR151B8-22FBl Symmetry Range Airborne FR151B8-22F Mechanical compliance Cms (X) Airborne FR151B8-22F Stiffness of suspension Kms (X) Airborne FR151B8-22F Kms Symmetry Range Airborne FR151B8-22F Electrical inductance L(X, I=0) Airborne FR151B8-22F Inductance over current L(X=0, I)

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.

Airborne FR151B8-22F 0 30 60

Harmonic Distortion at 96dB/1m

Airborne FR151B8-22F 96db HD

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