Fountek FR89EX

A brother of the FR88EX tested previously (click here), here’s the Fountek FR89EX test data.

fr89ex-4Stock photo courtesy of Madisound.

Comparison photo:

FR88EX vs FR89EX


Thiele-Small and Impedance Results

Electrical Parameters
 Re  3.61  Ohm  electrical voice coil resistance at DC
 Le  0.029  mH  frequency independent part of voice coil inductance
 L2  0.170  mH  para-inductance of voice coil
 R2  1.47  Ohm  electrical resistance due to eddy current losses
 Cmes  266  µF  electrical capacitance representing moving mass
 Lces  10.25  mH  electrical inductance representing driver compliance
 Res  8.32  Ohm  resistance due to mechanical losses
 fs  96.4  Hz  driver resonance frequency
 Mechanical Parameters
 (using test encl.)
 Mms  2.294  g  mechanical mass of driver diaphragm assembly including air load and voice coil
 Mmd (Sd)  2.213  g  mechanical mass of voice coil and diaphragm without air load
 Rms  1.035  kg/s  mechanical resistance of total-driver losses
 Cms  1.189  mm/N  mechanical compliance of driver suspension
 Kms  0.84  N/mm  mechanical stiffness of driver suspension
 Bl  2.936  N/A  force factor (Bl product)
 Loss factors
 Qtp  0.407  total Q-factor considering all losses
 Qms  1.342  mechanical Q-factor of driver in free air considering Rms only
 Qes  0.582  electrical Q-factor of driver in free air considering Re only
 Qts  0.406  total Q-factor considering Re and Rms only
Other Parameters
 Vas  1.2582  l  equivalent air volume of suspension
 n0  0.186  %  reference efficiency (2 pi-radiation using Re)
 Lm  84.89  dB  characteristic sound pressure level (SPL at 1m for 1W @ Re)
 Lnom  85.33  dB  nominal sensitivity (SPL at 1m for 1W @ Zn)
 Sd  27.34  cm²  diaphragm area

Fountek FR89EX impedance


Large Signal Analysis

Displacement Limits  thresholds can be changed in Processing property page
 X Bl @ Bl min=82%  >3.8  mm  Displacement limit due to force factor variation
 X C @ C min=75%  2.6  mm  Displacement limit due to compliance variation
 X L @ Z max=10 %  >3.8  mm  Displacement limit due to inductance variation
 X d @ d2=10%  10.7  mm  Displacement limit due to IM distortion (Doppler)

fr89ex img_Bl (X) fr89ex img_Bl Symmetry Range fr89ex img_Kms (X) fr89ex img_Kms Symmetry Range fr89ex img_Cmes (X) fr89ex img_L(X) fr89ex img_L(I) fr89ex img_Temperature_ Power fr89ex img_Distortion


Frequency Response

0, 30, and 60 degrees in the farfield at 1m, 2.83v input.  200hz-20khz.  1/24 Octave Resolution.

Fountek FR89EX 0 30 60

Harmonic Distortion

Note:  This test was performed in the farfield, and subsequent to environmental issues such as reflections and noise. Therefore, please disregard data below 200hz as I cannot guarantee it’s accuracy.

Fundamental + Harmonic distortion components (96dB1m) FR89EX Relative Harmonic distortion (96dB1m)

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One thought on “Fountek FR89EX

  1. Hmmm, I actually prefer the performance of the less expensive FR88ex to this driver. The FR89ex appears to have a more ragged top end response as well. Curious…

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